diff --git a/.eslintignore b/.eslintignore
deleted file mode 100644
index c256202..0000000
--- a/.eslintignore
+++ /dev/null
@@ -1,4 +0,0 @@
-lib/
-tmp/
-examples/app/bundle.js
-
diff --git a/.eslintrc.yml b/.eslintrc.yml
deleted file mode 100644
index 6461faf..0000000
--- a/.eslintrc.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-env:
-  browser: true
-  es2021: true
-  node: true
-  mocha: true
-extends: standard
-overrides: []
-parserOptions:
-  ecmaVersion: latest
-  sourceType: module
-rules:
-  n/no-deprecated-api: warn
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6b9a366..82098c2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [ 20 ]
+        node: [ 20, 22 ]
     name: Node ${{ matrix.node }}
     steps:
       - uses: actions/checkout@v4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43f8806..2c75571 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# 4.0.0 (2025-02-09)
+
+- fix: linting with eslint prettier (#e309f0e)
+- BREAKING CHANGE: min supported node@18 (#0375148)
+- chore: bump dependencies (#8af1300)
+- chore(ci): add node@22 (#2c097a4)
+
 # 3.2.1 (2024-10-04)
 
 - chore: bump dependencies (#5e03ed9)
@@ -5,8 +12,8 @@
 
 # 3.2.0 (2024-07-21)
 
-- docs: update ci badge (#e99f6b2)
 - chore: deprecate node 18 (#f3931fe)
+- docs: update ci badge (#e99f6b2)
 - chore: bump dependencies (#5b4de1f)
 
 # 3.1.4 (2024-03-13)
@@ -149,3 +156,4 @@
 - first version (#41890c0)
 - Initial commit (#d298779)
 
+
diff --git a/benchmarks/basic.bench.js b/benchmarks/basic.bench.js
index 87c18a3..d383b6c 100644
--- a/benchmarks/basic.bench.js
+++ b/benchmarks/basic.bench.js
@@ -3,45 +3,42 @@ const bench = require('fastbench')
 const max = JSON.parse(process.env.MAX || 10000)
 const stream = max === 1 ? process.stderr : undefined
 
-const {
-  bunyan,
-  debug,
-  pino,
-  pinoAsync,
-  debugLevel,
-  debugLevelAsync
-} = require('./instances.js')(stream)
+const { bunyan, debug, pino, pinoAsync, debugLevel, debugLevelAsync } =
+  require('./instances.js')(stream)
 
-const run = bench([
-  function benchDebug (done) {
-    debug('hello world')
-    process.nextTick(done)
-  },
-  function benchBunyan (done) {
-    bunyan.debug('hello world')
-    process.nextTick(done)
-  },
-  function benchPino (done) {
-    pino.debug('hello world')
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    debugLevel.debug('hello world')
-    process.nextTick(done)
-  },
-  function benchPinoAsync (done) {
-    pinoAsync.debug('hello world')
-    process.nextTick(done)
-  },
-  function benchDebugLevelAsync (done) {
-    debugLevelAsync.debug('hello world')
-    process.nextTick(done)
-  }
-], max)
+const run = bench(
+  [
+    function benchDebug(done) {
+      debug('hello world')
+      process.nextTick(done)
+    },
+    function benchBunyan(done) {
+      bunyan.debug('hello world')
+      process.nextTick(done)
+    },
+    function benchPino(done) {
+      pino.debug('hello world')
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      debugLevel.debug('hello world')
+      process.nextTick(done)
+    },
+    function benchPinoAsync(done) {
+      pinoAsync.debug('hello world')
+      process.nextTick(done)
+    },
+    function benchDebugLevelAsync(done) {
+      debugLevelAsync.debug('hello world')
+      process.nextTick(done)
+    }
+  ],
+  max
+)
 
 const final = () => {
   pinoAsync.flush()
   debugLevelAsync.flush()
 }
 
-run((final))
+run(final)
diff --git a/benchmarks/deep-j.bench.js b/benchmarks/deep-j.bench.js
index 50a3e4c..48b12e0 100644
--- a/benchmarks/deep-j.bench.js
+++ b/benchmarks/deep-j.bench.js
@@ -3,49 +3,46 @@ const bench = require('fastbench')
 const max = JSON.parse(process.env.MAX || 10000)
 const stream = max === 1 ? process.stderr : undefined
 
-const {
-  bunyan,
-  debug,
-  pino,
-  pinoAsync,
-  debugLevel,
-  debugLevelAsync
-} = require('./instances.js')(stream)
+const { bunyan, debug, pino, pinoAsync, debugLevel, debugLevelAsync } =
+  require('./instances.js')(stream)
 
 const deep = require('../package.json')
 deep.deep = Object.assign({}, JSON.parse(JSON.stringify(deep)))
 deep.deep.deep = Object.assign({}, JSON.parse(JSON.stringify(deep)))
 
-const run = bench([
-  function benchDebug (done) {
-    debug('deep %j', deep)
-    process.nextTick(done)
-  },
-  function benchBunyan (done) {
-    bunyan.debug('deep %j', deep)
-    process.nextTick(done)
-  },
-  function benchPino (done) {
-    pino.debug('deep %j', deep)
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    debugLevel.debug('deep %j', deep)
-    process.nextTick(done)
-  },
-  function benchPinoAsync (done) {
-    pinoAsync.debug('deep %j', deep)
-    process.nextTick(done)
-  },
-  function benchDebugLevelAsync (done) {
-    debugLevelAsync.debug('deep %j', deep)
-    process.nextTick(done)
-  }
-], max)
+const run = bench(
+  [
+    function benchDebug(done) {
+      debug('deep %j', deep)
+      process.nextTick(done)
+    },
+    function benchBunyan(done) {
+      bunyan.debug('deep %j', deep)
+      process.nextTick(done)
+    },
+    function benchPino(done) {
+      pino.debug('deep %j', deep)
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      debugLevel.debug('deep %j', deep)
+      process.nextTick(done)
+    },
+    function benchPinoAsync(done) {
+      pinoAsync.debug('deep %j', deep)
+      process.nextTick(done)
+    },
+    function benchDebugLevelAsync(done) {
+      debugLevelAsync.debug('deep %j', deep)
+      process.nextTick(done)
+    }
+  ],
+  max
+)
 
 const final = () => {
   pinoAsync.flush()
   debugLevelAsync.flush()
 }
 
-run((final))
+run(final)
diff --git a/benchmarks/deep.bench.js b/benchmarks/deep.bench.js
index 8d04d21..9d0a2f6 100644
--- a/benchmarks/deep.bench.js
+++ b/benchmarks/deep.bench.js
@@ -3,49 +3,46 @@ const bench = require('fastbench')
 const max = JSON.parse(process.env.MAX || 10000)
 const stream = max === 1 ? process.stderr : undefined
 
-const {
-  bunyan,
-  debug,
-  pino,
-  pinoAsync,
-  debugLevel,
-  debugLevelAsync
-} = require('./instances.js')(stream)
+const { bunyan, debug, pino, pinoAsync, debugLevel, debugLevelAsync } =
+  require('./instances.js')(stream)
 
 const deep = require('../package.json')
 deep.deep = Object.assign({}, JSON.parse(JSON.stringify(deep)))
 deep.deep.deep = Object.assign({}, JSON.parse(JSON.stringify(deep)))
 
-const run = bench([
-  function benchDebug (done) {
-    debug(deep)
-    process.nextTick(done)
-  },
-  function benchBunyan (done) {
-    bunyan.debug(deep)
-    process.nextTick(done)
-  },
-  function benchPino (done) {
-    pino.debug(deep)
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    debugLevel.debug(deep)
-    process.nextTick(done)
-  },
-  function benchPinoAsync (done) {
-    pinoAsync.debug(deep)
-    process.nextTick(done)
-  },
-  function benchDebugLevelAsync (done) {
-    debugLevelAsync.debug(deep)
-    process.nextTick(done)
-  }
-], max)
+const run = bench(
+  [
+    function benchDebug(done) {
+      debug(deep)
+      process.nextTick(done)
+    },
+    function benchBunyan(done) {
+      bunyan.debug(deep)
+      process.nextTick(done)
+    },
+    function benchPino(done) {
+      pino.debug(deep)
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      debugLevel.debug(deep)
+      process.nextTick(done)
+    },
+    function benchPinoAsync(done) {
+      pinoAsync.debug(deep)
+      process.nextTick(done)
+    },
+    function benchDebugLevelAsync(done) {
+      debugLevelAsync.debug(deep)
+      process.nextTick(done)
+    }
+  ],
+  max
+)
 
 const final = () => {
   pinoAsync.flush()
   debugLevelAsync.flush()
 }
 
-run((final))
+run(final)
diff --git a/benchmarks/format-s.bench.js b/benchmarks/format-s.bench.js
index 95f42eb..323a03b 100644
--- a/benchmarks/format-s.bench.js
+++ b/benchmarks/format-s.bench.js
@@ -3,45 +3,42 @@ const bench = require('fastbench')
 const max = JSON.parse(process.env.MAX || 10000)
 const stream = max === 1 ? process.stderr : undefined
 
-const {
-  bunyan,
-  debug,
-  pino,
-  pinoAsync,
-  debugLevel,
-  debugLevelAsync
-} = require('./instances.js')(stream)
+const { bunyan, debug, pino, pinoAsync, debugLevel, debugLevelAsync } =
+  require('./instances.js')(stream)
 
-const run = bench([
-  function benchDebug (done) {
-    debug('hello %s', 'world')
-    process.nextTick(done)
-  },
-  function benchBunyan (done) {
-    bunyan.debug('hello %s', 'world')
-    process.nextTick(done)
-  },
-  function benchPino (done) {
-    pino.debug('hello %s', 'world')
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    debugLevel.debug('hello %s', 'world')
-    process.nextTick(done)
-  },
-  function benchPinoAsync (done) {
-    pinoAsync.debug('hello %s', 'world')
-    process.nextTick(done)
-  },
-  function benchDebugLevelAsync (done) {
-    debugLevelAsync.debug('hello %s', 'world')
-    process.nextTick(done)
-  }
-], max)
+const run = bench(
+  [
+    function benchDebug(done) {
+      debug('hello %s', 'world')
+      process.nextTick(done)
+    },
+    function benchBunyan(done) {
+      bunyan.debug('hello %s', 'world')
+      process.nextTick(done)
+    },
+    function benchPino(done) {
+      pino.debug('hello %s', 'world')
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      debugLevel.debug('hello %s', 'world')
+      process.nextTick(done)
+    },
+    function benchPinoAsync(done) {
+      pinoAsync.debug('hello %s', 'world')
+      process.nextTick(done)
+    },
+    function benchDebugLevelAsync(done) {
+      debugLevelAsync.debug('hello %s', 'world')
+      process.nextTick(done)
+    }
+  ],
+  max
+)
 
 const final = () => {
   pinoAsync.flush()
   debugLevelAsync.flush()
 }
 
-run((final))
+run(final)
diff --git a/benchmarks/format-sjd.bench.js b/benchmarks/format-sjd.bench.js
index bff3a5a..101e355 100644
--- a/benchmarks/format-sjd.bench.js
+++ b/benchmarks/format-sjd.bench.js
@@ -3,45 +3,52 @@ const bench = require('fastbench')
 const max = JSON.parse(process.env.MAX || 10000)
 const stream = max === 1 ? process.stderr : undefined
 
-const {
-  bunyan,
-  debug,
-  pino,
-  pinoAsync,
-  debugLevel,
-  debugLevelAsync
-} = require('./instances.js')(stream)
+const { bunyan, debug, pino, pinoAsync, debugLevel, debugLevelAsync } =
+  require('./instances.js')(stream)
 
-const run = bench([
-  function benchDebug (done) {
-    debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })
-    process.nextTick(done)
-  },
-  function benchBunyan (done) {
-    bunyan.debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })
-    process.nextTick(done)
-  },
-  function benchPino (done) {
-    pino.debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    debugLevel.debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })
-    process.nextTick(done)
-  },
-  function benchPinoAsync (done) {
-    pinoAsync.debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })
-    process.nextTick(done)
-  },
-  function benchDebugLevelAsync (done) {
-    debugLevelAsync.debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })
-    process.nextTick(done)
-  }
-], max)
+const run = bench(
+  [
+    function benchDebug(done) {
+      debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })
+      process.nextTick(done)
+    },
+    function benchBunyan(done) {
+      bunyan.debug('hello %s %j %d', 'world', { obj: true }, 4, {
+        another: 'obj'
+      })
+      process.nextTick(done)
+    },
+    function benchPino(done) {
+      pino.debug('hello %s %j %d', 'world', { obj: true }, 4, {
+        another: 'obj'
+      })
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      debugLevel.debug('hello %s %j %d', 'world', { obj: true }, 4, {
+        another: 'obj'
+      })
+      process.nextTick(done)
+    },
+    function benchPinoAsync(done) {
+      pinoAsync.debug('hello %s %j %d', 'world', { obj: true }, 4, {
+        another: 'obj'
+      })
+      process.nextTick(done)
+    },
+    function benchDebugLevelAsync(done) {
+      debugLevelAsync.debug('hello %s %j %d', 'world', { obj: true }, 4, {
+        another: 'obj'
+      })
+      process.nextTick(done)
+    }
+  ],
+  max
+)
 
 const final = () => {
   pinoAsync.flush()
   debugLevelAsync.flush()
 }
 
-run((final))
+run(final)
diff --git a/benchmarks/instances.js b/benchmarks/instances.js
index 6840633..06d2375 100644
--- a/benchmarks/instances.js
+++ b/benchmarks/instances.js
@@ -6,7 +6,7 @@ const bunyanF = require('bunyan')
 const pinoF = require('pino')
 const { Log: DebugLevel } = require('..')
 
-function setup (stream) {
+function setup(stream) {
   if (!stream) {
     stream = fs.createWriteStream('/dev/null')
   }
@@ -16,24 +16,43 @@ function setup (stream) {
 
   const bunyan = bunyanF.createLogger({
     name,
-    streams: [{
-      level,
-      stream
-    }]
+    streams: [
+      {
+        level,
+        stream
+      }
+    ]
   })
 
   const debug = debugF(name)
   debug.inspectOpts.depth = Infinity
   if (path) {
-    debug.log = function (s) { stream.write(s) }
+    debug.log = function (s) {
+      stream.write(s)
+    }
   }
 
   const pino = pinoF({ name, level }, stream)
-  const pinoAsync = pinoF({ name, level }, pinoF.destination({ dest: path, fd, sync: true, minLength: 4096 }))
+  const pinoAsync = pinoF(
+    { name, level },
+    pinoF.destination({ dest: path, fd, sync: true, minLength: 4096 })
+  )
 
   DebugLevel.options({ json: true, colors: false, namespaces: '*' })
-  const debugLevel = new DebugLevel(name, { level, stream, sonic: false, serverinfo: true, timestamp: 'epoch' })
-  const debugLevelAsync = new DebugLevel(name, { level, stream, sonic: true, serverinfo: true, timestamp: 'epoch' })
+  const debugLevel = new DebugLevel(name, {
+    level,
+    stream,
+    sonic: false,
+    serverinfo: true,
+    timestamp: 'epoch'
+  })
+  const debugLevelAsync = new DebugLevel(name, {
+    level,
+    stream,
+    sonic: true,
+    serverinfo: true,
+    timestamp: 'epoch'
+  })
 
   return {
     bunyan,
diff --git a/benchmarks/long-string.bench.js b/benchmarks/long-string.bench.js
index 68fb2c5..6f08bf1 100644
--- a/benchmarks/long-string.bench.js
+++ b/benchmarks/long-string.bench.js
@@ -3,49 +3,50 @@ const bench = require('fastbench')
 const max = JSON.parse(process.env.MAX || 10000)
 const stream = max === 1 ? process.stderr : undefined
 
-const {
-  bunyan,
-  debug,
-  pino,
-  pinoAsync,
-  debugLevel,
-  debugLevelAsync
-} = require('./instances.js')(stream)
+const { bunyan, debug, pino, pinoAsync, debugLevel, debugLevelAsync } =
+  require('./instances.js')(stream)
 
-const a = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_*#$%&!"\''
-const random = () => a[Math.random() * a.length | 0]
-const longStr = new Array(2000).fill('').map(() => random()).join('')
+const a =
+  'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_*#$%&!"\''
+const random = () => a[(Math.random() * a.length) | 0]
+const longStr = new Array(2000)
+  .fill('')
+  .map(() => random())
+  .join('')
 
-const run = bench([
-  function benchDebug (done) {
-    debug(longStr)
-    process.nextTick(done)
-  },
-  function benchBunyan (done) {
-    bunyan.debug(longStr)
-    process.nextTick(done)
-  },
-  function benchPino (done) {
-    pino.debug(longStr)
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    debugLevel.debug(longStr)
-    process.nextTick(done)
-  },
-  function benchPinoAsync (done) {
-    pinoAsync.debug(longStr)
-    process.nextTick(done)
-  },
-  function benchDebugLevelAsync (done) {
-    debugLevelAsync.debug(longStr)
-    process.nextTick(done)
-  }
-], max)
+const run = bench(
+  [
+    function benchDebug(done) {
+      debug(longStr)
+      process.nextTick(done)
+    },
+    function benchBunyan(done) {
+      bunyan.debug(longStr)
+      process.nextTick(done)
+    },
+    function benchPino(done) {
+      pino.debug(longStr)
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      debugLevel.debug(longStr)
+      process.nextTick(done)
+    },
+    function benchPinoAsync(done) {
+      pinoAsync.debug(longStr)
+      process.nextTick(done)
+    },
+    function benchDebugLevelAsync(done) {
+      debugLevelAsync.debug(longStr)
+      process.nextTick(done)
+    }
+  ],
+  max
+)
 
 const final = () => {
   pinoAsync.flush()
   debugLevelAsync.flush()
 }
 
-run((final))
+run(final)
diff --git a/benchmarks/obj.bench.js b/benchmarks/obj.bench.js
index 93d83c9..ad75b1d 100644
--- a/benchmarks/obj.bench.js
+++ b/benchmarks/obj.bench.js
@@ -3,47 +3,44 @@ const bench = require('fastbench')
 const max = JSON.parse(process.env.MAX || 10000)
 const stream = max === 1 ? process.stderr : undefined
 
-const {
-  bunyan,
-  debug,
-  pino,
-  pinoAsync,
-  debugLevel,
-  debugLevelAsync
-} = require('./instances.js')(stream)
+const { bunyan, debug, pino, pinoAsync, debugLevel, debugLevelAsync } =
+  require('./instances.js')(stream)
 
 const obj = { msg: 'the message', string: 'string', number: 42, bool: true }
 
-const run = bench([
-  function benchDebug (done) {
-    debug(obj)
-    process.nextTick(done)
-  },
-  function benchBunyan (done) {
-    bunyan.debug(obj)
-    process.nextTick(done)
-  },
-  function benchPino (done) {
-    pino.debug(obj)
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    debugLevel.debug(obj)
-    process.nextTick(done)
-  },
-  function benchPinoAsync (done) {
-    pinoAsync.debug(obj)
-    process.nextTick(done)
-  },
-  function benchDebugLevelAsync (done) {
-    debugLevelAsync.debug(obj)
-    process.nextTick(done)
-  }
-], max)
+const run = bench(
+  [
+    function benchDebug(done) {
+      debug(obj)
+      process.nextTick(done)
+    },
+    function benchBunyan(done) {
+      bunyan.debug(obj)
+      process.nextTick(done)
+    },
+    function benchPino(done) {
+      pino.debug(obj)
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      debugLevel.debug(obj)
+      process.nextTick(done)
+    },
+    function benchPinoAsync(done) {
+      pinoAsync.debug(obj)
+      process.nextTick(done)
+    },
+    function benchDebugLevelAsync(done) {
+      debugLevelAsync.debug(obj)
+      process.nextTick(done)
+    }
+  ],
+  max
+)
 
 const final = () => {
   pinoAsync.flush()
   debugLevelAsync.flush()
 }
 
-run((final))
+run(final)
diff --git a/benchmarks/run.js b/benchmarks/run.js
index b77e9f6..b7c65a2 100644
--- a/benchmarks/run.js
+++ b/benchmarks/run.js
@@ -2,20 +2,41 @@ const { spawnSync } = require('child_process')
 const { join } = require('path')
 
 const files = [
-  { file: 'basic.bench.js', name: 'Basic String', fmt: "log.debug('hello world')" },
-  { file: 'long-string.bench.js', name: 'Long String 2000 chars', fmt: "log.debug('...2000chars...')" },
-  { file: 'format-s.bench.js', name: 'Hello World with %s format', fmt: "log.debug('hello %s', 'world')" },
-  { file: 'format-sjd.bench.js', name: 'Multi Argument format', fmt: "log.debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })" },
-  { file: 'obj.bench.js', name: 'Object', fmt: "log.debug({ msg: 'the message',string: 'string',number: 42,bool: true })" },
+  {
+    file: 'basic.bench.js',
+    name: 'Basic String',
+    fmt: "log.debug('hello world')"
+  },
+  {
+    file: 'long-string.bench.js',
+    name: 'Long String 2000 chars',
+    fmt: "log.debug('...2000chars...')"
+  },
+  {
+    file: 'format-s.bench.js',
+    name: 'Hello World with %s format',
+    fmt: "log.debug('hello %s', 'world')"
+  },
+  {
+    file: 'format-sjd.bench.js',
+    name: 'Multi Argument format',
+    fmt: "log.debug('hello %s %j %d', 'world', { obj: true }, 4, { another: 'obj' })"
+  },
+  {
+    file: 'obj.bench.js',
+    name: 'Object',
+    fmt: "log.debug({ msg: 'the message',string: 'string',number: 42,bool: true })"
+  },
   { file: 'deep.bench.js', name: 'Deep Object', fmt: 'log.debug(deep)' },
-  { file: 'deep-j.bench.js', name: 'Deep Object with %j format', fmt: "log.debug('deep %j', deep)" }
+  {
+    file: 'deep-j.bench.js',
+    name: 'Deep Object with %j format',
+    fmt: "log.debug('deep %j', deep)"
+  }
 ]
 
 files.forEach(({ file, name, fmt }) => {
-  let { stdout, stderr } = spawnSync(
-    process.argv[0],
-    [join(__dirname, file)]
-  )
+  let { stdout, stderr } = spawnSync(process.argv[0], [join(__dirname, file)])
 
   if (stderr.length) {
     stdout = stderr
@@ -28,6 +49,5 @@ files.forEach(({ file, name, fmt }) => {
 
 \`\`\`
 ${stdout}
-\`\`\``
-  )
+\`\`\``)
 })
diff --git a/benchmarks/single.js b/benchmarks/single.js
index 9e402b7..5aacaf1 100644
--- a/benchmarks/single.js
+++ b/benchmarks/single.js
@@ -18,28 +18,31 @@ const {
 // obj.deep = clean(obj)
 
 const obj = { string: 'lala', foo: 42, is: true }
-const f = () => (['hello %j', obj])
+const f = () => ['hello %j', obj]
 // const f = () => ([obj])
 
-const run = bench([
-  function benchPino (done) {
-    // debugger
-    pino.debug(...f())
-    process.nextTick(done)
-  },
-  function benchDebugLevel (done) {
-    // debugger
-    debugLevel.debug(...f())
-    process.nextTick(done)
-  }
-  // function benchPinoAsync (done) {
-  //   pinoAsync.debug(deep)
-  //   process.nextTick(done)
-  // },
-  // function benchDebugLevelAsync (done) {
-  //   debugLevelAsync.debug(deep)
-  //   process.nextTick(done)
-  // }
-], max)
+const run = bench(
+  [
+    function benchPino(done) {
+      // debugger
+      pino.debug(...f())
+      process.nextTick(done)
+    },
+    function benchDebugLevel(done) {
+      // debugger
+      debugLevel.debug(...f())
+      process.nextTick(done)
+    }
+    // function benchPinoAsync (done) {
+    //   pinoAsync.debug(deep)
+    //   process.nextTick(done)
+    // },
+    // function benchDebugLevelAsync (done) {
+    //   debugLevelAsync.debug(deep)
+    //   process.nextTick(done)
+    // }
+  ],
+  max
+)
 
 run(run)
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..53b617d
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,24 @@
+import globals from 'globals'
+import pluginPrettier from 'eslint-plugin-prettier/recommended'
+
+const config = [
+  { languageOptions: { globals: { ...globals.node, ...globals.mocha } } },
+  pluginPrettier,
+  {
+    rules: {
+      'no-unused-vars': [
+        'error',
+        {
+          varsIgnorePattern: '^_$',
+          argsIgnorePattern: '^_',
+          caughtErrors: 'none'
+        }
+      ]
+    }
+  },
+  {
+    ignores: ['coverage/', 'docs/', 'tmp/', 'examples/app/bundle.js']
+  }
+]
+
+export default config
diff --git a/examples/app/index.js b/examples/app/index.js
index 5740313..b2aa277 100644
--- a/examples/app/index.js
+++ b/examples/app/index.js
@@ -7,9 +7,10 @@ window.localStorage.setItem('DEBUG_LEVEL', 'TRACE')
 const log = new Log('myApp')
 
 const ORD = ['th', 'st', 'nd', 'rd']
-const ordinals = (num) => num + (num > 10 && num < 14 ? 'th' : ORD[num % 10] || ORD[0])
+const ordinals = (num) =>
+  num + (num > 10 && num < 14 ? 'th' : ORD[num % 10] || ORD[0])
 const LEVEL = ['DEBUG', 'INFO', 'WARN', 'ERROR', 'FATAL']
-const levels = () => LEVEL[Math.random() * LEVEL.length | 0]
+const levels = () => LEVEL[(Math.random() * LEVEL.length) | 0]
 let count = 1
 
 setInterval(() => {
diff --git a/examples/app/server.cjs b/examples/app/server.cjs
index 6de03a2..67b65c6 100644
--- a/examples/app/server.cjs
+++ b/examples/app/server.cjs
@@ -9,7 +9,7 @@ const log = new Log('server')
 const logMw = browserLogs()
 const port = 3000
 
-function serveStatic (req, res) {
+function serveStatic(req, res) {
   const url = join(__dirname, '.', req.url)
   fs.stat(url, (err) => {
     if (err) {
@@ -20,18 +20,20 @@ function serveStatic (req, res) {
   })
 }
 
-http.createServer((req, res) => {
-  log.info(req.url)
+http
+  .createServer((req, res) => {
+    log.info(req.url)
 
-  if (/^\/debug-level/.test(req.url)) {
-    req.ip = req.ip || req.socket.remoteAddress
-    logMw(req, res)
-  } else {
-    if (req.url === '/') {
-      req.url = '/index.html'
+    if (/^\/debug-level/.test(req.url)) {
+      req.ip = req.ip || req.socket.remoteAddress
+      logMw(req, res)
+    } else {
+      if (req.url === '/') {
+        req.url = '/index.html'
+      }
+      serveStatic(req, res)
     }
-    serveStatic(req, res)
-  }
-}).listen(port, () => {
-  console.log(`\n  browse to http://localhost:${port}\n\n`)
-})
+  })
+  .listen(port, () => {
+    console.log(`\n  browse to http://localhost:${port}\n\n`)
+  })
diff --git a/examples/app/webpack.config.cjs b/examples/app/webpack.config.cjs
index 6599488..1c3047b 100644
--- a/examples/app/webpack.config.cjs
+++ b/examples/app/webpack.config.cjs
@@ -19,6 +19,5 @@ module.exports = {
       }
     ]
   },
-  plugins: [
-  ]
+  plugins: []
 }
diff --git a/examples/client.js b/examples/client.js
index 2265026..a87d61f 100644
--- a/examples/client.js
+++ b/examples/client.js
@@ -4,9 +4,10 @@ import { logger } from '../src/index.js'
 const logA = logger('client:A')
 const logB = logger('client:B')
 
-function client (log, path) {
-  function request () {
-    http.get({ host: 'localhost', port: '3000', path })
+function client(log, path) {
+  function request() {
+    http
+      .get({ host: 'localhost', port: '3000', path })
       .on('response', (res) => {
         const status = res.statusCode
         res.on('data', (chunk) => {
diff --git a/examples/jsonOutput.cjs b/examples/jsonOutput.cjs
index 6ece16d..1cc6de9 100644
--- a/examples/jsonOutput.cjs
+++ b/examples/jsonOutput.cjs
@@ -5,7 +5,13 @@ const log = new Log('package')
 
 // ----
 // use formatters (NOT RECOMMENDED for objects, errors)
-log.debug('a %s, a number %d, an %o and %j', 'string', 1.2, { object: 1 }, { NOT: 'RECOMMENDED' })
+log.debug(
+  'a %s, a number %d, an %o and %j',
+  'string',
+  1.2,
+  { object: 1 },
+  { NOT: 'RECOMMENDED' }
+)
 /* > {
   "level": "DEBUG",
   "name": "package",
@@ -77,13 +83,14 @@ log.info('formatter %s', 'message1', 'message2', 'message3')
 
 // ----
 // using toJSON custom serializers
-function reqToJSON () {
+function reqToJSON() {
   const { ip, method, url, headers } = this
   const userAgent = headers ? headers['user-agent'] : undefined
   return { ip, method, url, userAgent }
 }
 
-const req = { // a client request
+const req = {
+  // a client request
   method: 'GET',
   url: '/path',
   ip: '10.10.10.10',
@@ -92,12 +99,13 @@ const req = { // a client request
 }
 req.toJSON = reqToJSON
 
-function resToJSON () {
+function resToJSON() {
   const { statusCode } = this
   return { statusCode }
 }
 
-const res = { // a server response
+const res = {
+  // a server response
   statusCode: 403,
   socket: {} // ....
 }
diff --git a/examples/options.js b/examples/options.js
index 0f7957f..ce62f7c 100644
--- a/examples/options.js
+++ b/examples/options.js
@@ -16,7 +16,13 @@ Log.options({
 const log = new Log('*')
 
 log.debug({ object: 1 }) // ...
-log.debug('a %s, a number %d, an %o and %j', 'string', 1.2, { object: 1 }, { json: true })
+log.debug(
+  'a %s, a number %d, an %o and %j',
+  'string',
+  1.2,
+  { object: 1 },
+  { json: true }
+)
 log.debug({ object: 1 }, { json: true })
 const err = new Error('bam')
 err.status = 500
diff --git a/examples/server.js b/examples/server.js
index d0d1c8b..95ff3e3 100644
--- a/examples/server.js
+++ b/examples/server.js
@@ -7,23 +7,25 @@ const logHttpMw = httpLogs()
 const log = new Log('server')
 
 const codes = [200, 200, 200, 404, 500]
-const randomStatus = () => codes[Math.random() * codes.length | 0]
+const randomStatus = () => codes[(Math.random() * codes.length) | 0]
 
 // fake app
 log.info('booting %o', name)
 
-http.createServer(function (req, res) {
-  log.debug('%s %s', req.method, req.url)
-
-  logHttpMw(req, res, () => {})
-
-  const str = req.url.replace(/[/]/g, '')
-  res.statusCode = randomStatus()
-  // res.setHeader('Set-Cookie', ['foo=bar', 'session=foobar'])
-  res.setHeader('Set-Cookie', 'session=foobar')
-  res.end(`hello ${str}`)
-}).listen(3000, function () {
-  log.info('listening')
-})
+http
+  .createServer(function (req, res) {
+    log.debug('%s %s', req.method, req.url)
+
+    logHttpMw(req, res, () => {})
+
+    const str = req.url.replace(/[/]/g, '')
+    res.statusCode = randomStatus()
+    // res.setHeader('Set-Cookie', ['foo=bar', 'session=foobar'])
+    res.setHeader('Set-Cookie', 'session=foobar')
+    res.end(`hello ${str}`)
+  })
+  .listen(3000, function () {
+    log.info('listening')
+  })
 
 import('./client.js')
diff --git a/examples/toJSON.cjs b/examples/toJSON.cjs
index 60c5e91..c4cb15c 100644
--- a/examples/toJSON.cjs
+++ b/examples/toJSON.cjs
@@ -1,7 +1,7 @@
 const { Log } = require('..')
 const log = new Log('req', { json: false })
 
-function reqToJSON () {
+function reqToJSON() {
   const { ip, method, url } = this
   return { ip, method, url }
 }
diff --git a/karma.conf.cjs b/karma.conf.cjs
index 902a31f..91a2bf3 100644
--- a/karma.conf.cjs
+++ b/karma.conf.cjs
@@ -2,7 +2,7 @@ const karmaTestMiddleware = require('./test/helpers/karma-test-middleware.cjs')
 const path = require('path')
 
 // Reference: http://karma-runner.github.io/0.13/config/configuration-file.html
-module.exports = function karmaConfig (config) {
+module.exports = function karmaConfig(config) {
   config.set({
     browsers: [
       'Firefox',
@@ -45,10 +45,7 @@ module.exports = function karmaConfig (config) {
 
     // Configure code coverage reporter
     coverageReporter: {
-      reporters: [
-        { type: 'html', dir: 'coverage/' },
-        { type: 'text' }
-      ]
+      reporters: [{ type: 'html', dir: 'coverage/' }, { type: 'text' }]
     },
 
     client: {
diff --git a/package.json b/package.json
index f19f9f8..a772b3a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "debug-level",
-  "version": "3.2.1",
+  "version": "4.0.0-0",
   "description": "debug with levels",
   "keywords": [
     "debug",
@@ -16,6 +16,7 @@
   },
   "license": "MIT",
   "author": "commenthol <commenthol@gmail.com>",
+  "sideEffects": false,
   "type": "module",
   "exports": {
     ".": {
@@ -59,7 +60,7 @@
     "coveralls": "npm run build && c8 npm test && c8 report --reporter=text-lcov | coveralls",
     "example": "npm run build:example && npm run start:example",
     "changelog": "conv-changelog -i CHANGELOG.md -o",
-    "lint": "eslint --ext .js .",
+    "lint": "eslint .",
     "readme": "markedpp --github -i README.md -o README.md",
     "start:example": "DEBUG=* node examples/app/server.cjs",
     "test": "mocha",
@@ -78,21 +79,21 @@
     "flatstr": "^1.0.12",
     "map-lru": "^2.1.0",
     "ms": "^2.1.3",
-    "sonic-boom": "^4.1.0"
+    "sonic-boom": "^4.2.0"
   },
   "devDependencies": {
-    "@babel/cli": "^7.25.7",
-    "@babel/core": "^7.25.7",
-    "@babel/preset-env": "^7.25.7",
+    "@types/node": "^22.13.1",
+    "@babel/cli": "^7.26.4",
+    "@babel/core": "^7.26.8",
+    "@babel/preset-env": "^7.26.8",
     "assert": "^2.1.0",
     "babel-loader": "^9.2.1",
-    "c8": "^10.1.2",
+    "c8": "^10.1.3",
     "conv-changelog": "^1.0.0",
-    "eslint": "^8.57.1",
-    "eslint-config-standard": "^17.1.0",
-    "eslint-plugin-import": "^2.31.0",
-    "eslint-plugin-n": "^16.6.2",
-    "eslint-plugin-promise": "^6.6.0",
+    "globals": "^15.14.0",
+    "eslint": "^9.20.0",
+    "eslint-config-prettier": "^10.0.1",
+    "eslint-plugin-prettier": "^5.2.3",
     "karma": "^6.4.4",
     "karma-chrome-launcher": "^3.2.0",
     "karma-coverage": "^2.2.1",
@@ -101,20 +102,20 @@
     "karma-sourcemap-loader": "^0.4.0",
     "karma-spec-reporter": "^0.0.36",
     "karma-webpack": "^5.0.1",
-    "mocha": "^10.7.3",
-    "npm-run-all2": "^6.2.3",
+    "mocha": "^11.1.0",
+    "npm-run-all2": "^7.0.2",
     "rimraf": "^6.0.1",
-    "rollup": "^4.24.0",
-    "sinon": "^18.0.1",
-    "typescript": "^5.6.2",
-    "webpack": "^5.95.0",
-    "webpack-cli": "^5.1.4"
+    "rollup": "^4.34.6",
+    "sinon": "^19.0.2",
+    "typescript": "^5.7.3",
+    "webpack": "^5.97.1",
+    "webpack-cli": "^6.0.1"
   },
   "optionalDependencies": {
     "debug": "^4.3.1"
   },
   "engines": {
-    "node": ">=12"
+    "node": ">=18"
   },
   "c4uIgnore": {
     "chalk": "^4.0.0 // ^5 is ESM only and won't work with transpiled version"
diff --git a/src/Format.js b/src/Format.js
index e27343f..7f7f024 100644
--- a/src/Format.js
+++ b/src/Format.js
@@ -10,22 +10,22 @@ export class Format {
   /**
    * @param {FormatOption} [opts]
    */
-  constructor (opts) {
+  constructor(opts) {
     const { spaces } = opts || {}
     this.opts = { spaces }
     this._formatOpts()
   }
 
-  get spaces () {
+  get spaces() {
     return this.opts.spaces
   }
 
-  set spaces (spaces) {
+  set spaces(spaces) {
     this.opts.spaces = spaces
     this._formatOpts()
   }
 
-  _formatOpts () {
+  _formatOpts() {
     /**
      * @param {any} any
      * @returns {string}
@@ -42,7 +42,7 @@ export class Format {
    * @param  {...any} args
    * @returns {string}
    */
-  stringify (...args) {
+  stringify(...args) {
     // @ts-expect-error
     return fastStringify(...args)
   }
@@ -54,7 +54,7 @@ export class Format {
    * @param {any} obj
    * @return {Array} first is formatted message, other args may follow
    */
-  format (fmt, args, obj) {
+  format(fmt, args, obj) {
     return quickFormat(fmt, args, this.formatOpts, obj)
   }
 }
diff --git a/src/LogBase.js b/src/LogBase.js
index be71aab..1056b67 100644
--- a/src/LogBase.js
+++ b/src/LogBase.js
@@ -2,13 +2,13 @@ import { Format } from './Format.js'
 import { toNumLevel, adjustLevel, LEVELS, LOG, INFO, FATAL } from './utils.js'
 import { Namespaces } from './Namespaces.js'
 
-const noop = (...args) => {}
+const noop = (..._args) => {}
 
 /** @typedef {'epoch'|'unix'|'iso'} Timestamp */
 
 const time = {
   epoch: () => Date.now(),
-  unix: () => Date.now() / 1000 | 0,
+  unix: () => (Date.now() / 1000) | 0,
   iso: () => new Date().toISOString()
 }
 
@@ -35,21 +35,23 @@ export class LogBase {
    * @param {string} name
    * @param {LogBaseOptions} opts
    */
-  constructor (name, opts = {}) {
+  constructor(name, opts = {}) {
     this.name = name
     this.opts = opts
     this._enabled = {}
     this.formatter = new Format(opts)
 
     /** @type {{ [x: string]: (arg0: any) => any; } | null} */
-    this.serializers = Object.entries(this.opts.serializers || {})
-      .reduce((/** @type {object} */ curr, [key, val]) => {
+    this.serializers = Object.entries(this.opts.serializers || {}).reduce(
+      (/** @type {object} */ curr, [key, val]) => {
         if (typeof val === 'function') {
           curr = curr || {}
           curr[key] = val
         }
         return curr
-      }, null)
+      },
+      null
+    )
 
     this._timeF = time[opts.timestamp]
     this._time = this._timeF ? this._timeF : noop
@@ -82,26 +84,25 @@ export class LogBase {
   /**
    * @param {string} [namespaces]
    */
-  enable (namespaces = this.opts.namespaces) {
+  enable(namespaces = this.opts.namespaces) {
     const namespace = new Namespaces(namespaces)
     this._enabled = {} // reset
     const level = namespace.isEnabled(this.name, this.opts.level)
-    const active = level
-      ? LEVELS[adjustLevel(level, INFO)]
-      : []
-    LEVELS.TRACE.forEach(level => {
+    const active = level ? LEVELS[adjustLevel(level, INFO)] : []
+    LEVELS.TRACE.forEach((level) => {
       const nlevel = this.opts.levelNumbers ? toNumLevel(level) : level
       const llevel = level.toLowerCase()
       if (active.includes(level)) {
         this._enabled[level] = true
-        this[llevel] = level === FATAL
-          ? (fmt, ...args) => {
-              const str = this._log(nlevel, fmt, args)
-              // @ts-expect-error
-              this.flush && this.flush()
-              return str
-            }
-          : (fmt, ...args) => this._log(nlevel, fmt, args)
+        this[llevel] =
+          level === FATAL
+            ? (fmt, ...args) => {
+                const str = this._log(nlevel, fmt, args)
+                // @ts-expect-error
+                this.flush && this.flush()
+                return str
+              }
+            : (fmt, ...args) => this._log(nlevel, fmt, args)
       } else {
         this[llevel] = noop
       }
@@ -110,16 +111,17 @@ export class LogBase {
     this.log = (fmt, ...args) => this._log(nLOG, fmt, args)
   }
 
-  get enabled () {
-    return this._enabled._cache || (
-      this._enabled._cache = LEVELS.TRACE.reduce((o, level) => {
+  get enabled() {
+    return (
+      this._enabled._cache ||
+      (this._enabled._cache = LEVELS.TRACE.reduce((o, level) => {
         o[level] = o[level.toLowerCase()] = !!this._enabled[level]
         return o
-      }, {})
+      }, {}))
     )
   }
 
-  diff () {
+  diff() {
     const curr = Date.now()
     const prev = this._prev || curr
     this._prev = curr
@@ -129,7 +131,7 @@ export class LogBase {
   /**
    * @return {object} json object
    */
-  _formatJson (level, fmt, args = []) {
+  _formatJson(level, fmt, args = []) {
     const other = {}
     const msg = this.formatter.format(fmt, args, other) || undefined
 
@@ -147,11 +149,14 @@ export class LogBase {
     return o
   }
 
-  _applySerializers (obj) {
+  _applySerializers(obj) {
     const o = {}
     for (const key in obj) {
       const value = obj[key]
-      if (Object.prototype.hasOwnProperty.call(obj, key) && value !== undefined) {
+      if (
+        Object.prototype.hasOwnProperty.call(obj, key) &&
+        value !== undefined
+      ) {
         if (this.serializers && this.serializers[key]) {
           o[key] = this.serializers[key](value)
         } else {
@@ -163,13 +168,13 @@ export class LogBase {
   }
 
   /* c8 ignore next */
-  _serverinfo () { }
+  _serverinfo() {}
 
   /**
    * @protected
    */
   /* c8 ignore next 3 */
-  _log (nlevel, fmt, args) {
+  _log(_nlevel, _fmt, _args) {
     throw new Error('needs implementation')
   }
 }
diff --git a/src/Namespaces.js b/src/Namespaces.js
index 89e398c..89d4a2c 100644
--- a/src/Namespaces.js
+++ b/src/Namespaces.js
@@ -10,7 +10,7 @@ const LEVELS = [TRACE, DEBUG, INFO, WARN, ERROR, FATAL, OFF]
 const LEVELS_REGEX = RegExp(`^(${LEVELS.join('|')}):`, 'i')
 
 export class Namespaces {
-  constructor (namespaces) {
+  constructor(namespaces) {
     this.skips = []
     this.names = []
     this.enable(namespaces)
@@ -19,14 +19,13 @@ export class Namespaces {
   /**
    * @param {string} namespaces
    */
-  enable (namespaces) {
+  enable(namespaces) {
     this.skips = []
     this.names = []
 
-    const splited = (typeof namespaces === 'string'
-      ? namespaces
-      : ''
-    ).split(/[\s,]+/)
+    const splited = (typeof namespaces === 'string' ? namespaces : '').split(
+      /[\s,]+/
+    )
 
     for (const _namespace of splited) {
       if (!_namespace) continue // ignore empty strings
@@ -39,18 +38,20 @@ export class Namespaces {
     }
 
     // sort names by levels
-    this.names = this.names.sort((a, b) => LEVELS.indexOf(a.level) - LEVELS.indexOf(b.level))
+    this.names = this.names.sort(
+      (a, b) => LEVELS.indexOf(a.level) - LEVELS.indexOf(b.level)
+    )
   }
 
   /* c8 ignore next 3 */
-  disable () {
+  disable() {
     this.enable('')
   }
 
   /**
    * @param {string} name
    */
-  isEnabled (name, level) {
+  isEnabled(name, level) {
     if (name === '*') {
       return level || 'DEBUG'
     }
@@ -74,11 +75,9 @@ export class Namespaces {
    * @param {string} _namespace
    * @private
    */
-  _namespaceNLevel (_namespace) {
+  _namespaceNLevel(_namespace) {
     const level = (LEVELS_REGEX.exec(_namespace) || [])[1]
-    const namespace = _namespace
-      .replace(LEVELS_REGEX, '')
-      .replace(/\*/g, '.*?')
+    const namespace = _namespace.replace(LEVELS_REGEX, '').replace(/\*/g, '.*?')
     return { namespace, level }
   }
 }
diff --git a/src/Sonic.js b/src/Sonic.js
index d89063c..3cd86fb 100644
--- a/src/Sonic.js
+++ b/src/Sonic.js
@@ -23,7 +23,7 @@ export class Sonic {
    * @param {NodeJS.WriteStream} stream
    * @param {SonicOptions} opts
    */
-  constructor (stream, opts = {}) {
+  constructor(stream, opts = {}) {
     const { minLength = 4096, timeout = 1000 } = opts
     this._timer = undefined
     this._timeout = timeout
@@ -44,7 +44,7 @@ export class Sonic {
    * @param {string} data
    * @returns {boolean}
    */
-  write (data) {
+  write(data) {
     const isWritten = this.stream.write(data)
 
     if (!this._timer) {
@@ -57,19 +57,19 @@ export class Sonic {
     return isWritten
   }
 
-  flush () {
+  flush() {
     // @ts-expect-error
     if (!this.stream.destroyed) {
       this.stream.flushSync()
     }
   }
 
-  destroy () {
+  destroy() {
     this.stream.destroy()
   }
 }
 
-function filterBrokenPipe (stream, err) {
+function filterBrokenPipe(stream, err) {
   if (err.code === 'EPIPE') {
     // If we get EPIPE, we should stop logging here
     // however we have no control to the consumer of
@@ -91,7 +91,7 @@ export class SonicStreams extends Map {
    * @param {Record<string,any>} opts
    * @returns {string}
    */
-  static hash (opts) {
+  static hash(opts) {
     return (
       'sonic!' +
       Object.keys(opts || {})
@@ -106,7 +106,7 @@ export class SonicStreams extends Map {
    * @param {SonicOptions} [opts]
    * @returns {Sonic}
    */
-  use (stream, opts = {}) {
+  use(stream, opts = {}) {
     const streamHash = SonicStreams.hash(streamDescriptor(stream))
     const optsHash = SonicStreams.hash(opts)
     let streamRecord = this.get(streamHash)
diff --git a/src/browser.js b/src/browser.js
index 0674095..3c2d294 100644
--- a/src/browser.js
+++ b/src/browser.js
@@ -44,9 +44,11 @@ const options = {
 const storage = () => {
   try {
     // @ts-expect-error
-    return typeof chrome !== 'undefined' && typeof chrome.storage !== 'undefined'
+    return typeof chrome !== 'undefined' &&
       // @ts-expect-error
-      ? chrome.storage.local
+      typeof chrome.storage !== 'undefined'
+      ? // @ts-expect-error
+        chrome.storage.local
       : window.localStorage
   } catch (err) {
     // istanbul ignore next
@@ -66,18 +68,25 @@ const supportsColors = () => {
   // NB: In an Electron preload script, document will be defined but not fully
   // initialized. Since we know we're in Chrome, we'll just detect this case
   // explicitly
-  const isElectron = typeof window !== 'undefined' &&
+  const isElectron =
+    typeof window !== 'undefined' &&
+    (tmp = window.process) &&
     // @ts-expect-error
-    (tmp = window.process) && (tmp.type === 'renderer')
+    tmp.type === 'renderer'
   // is webkit? http://stackoverflow.com/a/16459606/376773
   // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
-  const isReactNative = typeof document !== 'undefined' &&
+  const isReactNative =
+    typeof document !== 'undefined' &&
+    (tmp = document.documentElement) &&
+    (tmp = tmp.style) &&
     // @ts-expect-error
-    (tmp = document.documentElement) && (tmp = tmp.style) && tmp.WebkitAppearance
+    tmp.WebkitAppearance
   // is firebug? http://stackoverflow.com/a/398120/376773
-  const isFireBug = typeof window !== 'undefined' &&
+  const isFireBug =
+    typeof window !== 'undefined' &&
+    (tmp = window.console) &&
     // @ts-expect-error
-    (tmp = window.console) && (tmp.firebug || (tmp.exception && tmp.table))
+    (tmp.firebug || (tmp.exception && tmp.table))
 
   if (isElectron) {
     // istanbul ignore next
@@ -90,12 +99,14 @@ const supportsColors = () => {
     return false
   }
 
-  return !!(isReactNative || isFireBug ||
+  return !!(
+    isReactNative ||
+    isFireBug ||
     // is firefox >= v31?
     // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
     (/firefox\/(\d+)/i.exec(userAgent) && parseInt(RegExp.$1, 10) >= 31) ||
     // double check webkit in userAgent just in case we are in a worker
-    (/applewebkit\/(\d+)/i.exec(userAgent))
+    /applewebkit\/(\d+)/i.exec(userAgent)
   )
 }
 
@@ -107,17 +118,18 @@ export class Log extends LogBase {
    * @param {string} name namespace of Logger
    * @param {LogOptionsBrowser} opts
    */
-  constructor (name, opts) {
+  constructor(name, opts) {
     const _storage = storage()
 
-    Object.assign(options,
-      inspectOpts(_storage),
-      inspectNamespaces(_storage)
-    )
+    Object.assign(options, inspectOpts(_storage), inspectNamespaces(_storage))
 
     options.colors = options.colors === false ? false : supportsColors()
 
-    const serializers = Object.assign({}, options.serializers, opts?.serializers)
+    const serializers = Object.assign(
+      {},
+      options.serializers,
+      opts?.serializers
+    )
 
     const _opts = Object.assign({}, options, opts, { serializers })
     super(name, _opts)
@@ -135,8 +147,10 @@ export class Log extends LogBase {
    * @param {LogOptionsBrowser} [opts] changed options
    * @return {object} global options
    */
-  static options (opts) {
-    if (!opts) { return Object.assign({}, options) }
+  static options(opts) {
+    if (!opts) {
+      return Object.assign({}, options)
+    }
     Object.assign(options, opts, {
       colors: opts.colors === false ? false : supportsColors()
     })
@@ -146,7 +160,7 @@ export class Log extends LogBase {
   /**
    * save options in `localStorage`
    */
-  static save () {
+  static save() {
     const _storage = storage()
     Log.reset()
     saveOpts(_storage, options)
@@ -155,7 +169,7 @@ export class Log extends LogBase {
   /**
    * reset saved options
    */
-  static reset () {
+  static reset() {
     const _storage = storage()
 
     Object.keys(_storage).forEach((key) => {
@@ -178,7 +192,7 @@ export class Log extends LogBase {
    * @param {LogOptionWrapConsole} [opts]
    * @return {function} unwrap function
    */
-  static wrapConsole (name = 'console', opts = {}) {
+  static wrapConsole(name = 'console', opts = {}) {
     const log = new Log(name, opts)
     return wrapConsole(log, opts)
   }
@@ -187,11 +201,11 @@ export class Log extends LogBase {
    * render arguments to console.log
    * @public
    * @param {any[]} args console.log arguments
-   * @param {Level} level level of log line (might be used for custom Logger which uses different streams per level)
+   * @param {Level} [_level] level of log line (might be used for custom Logger which uses different streams per level)
    * @return {any[]}
    */
-  render (args, level) {
-    console.log(...args) // eslint-disable-line no-console
+  render(args, _level) {
+    console.log(...args)
     return args
   }
 
@@ -201,7 +215,7 @@ export class Log extends LogBase {
    * @param {string} [fmt] formatter
    * @param {any[]} [args] log arguments
    */
-  send (level, fmt, args) {
+  send(level, fmt, args) {
     let obj
     if (typeof level === 'object') {
       obj = level
@@ -218,7 +232,7 @@ export class Log extends LogBase {
    * format log arguments
    * @protected
    */
-  _log (level, fmt, args) {
+  _log(level, fmt, args) {
     const uns = this._formatJson(level, fmt, args)
     const obj = this._applySerializers(uns)
     const _args = this._format(obj)
@@ -234,10 +248,12 @@ export class Log extends LogBase {
   /**
    * format arguments for console.log
    * @private
-   * @param {object} param0
+   * @param {object} options
    * @return {Array} args for console.log
    */
-  _format ({ level, name, time, msg = '', diff, ...other }) {
+  _format(options) {
+    // eslint-disable-next-line no-unused-vars
+    const { level, name, time, msg = '', diff, ...other } = options
     const color = this.color
     const args = []
     const hasOther = Object.keys(other).length
@@ -248,7 +264,9 @@ export class Log extends LogBase {
       msg,
       hasOther ? '%O' : undefined,
       this._color('+' + ms(diff))
-    ].filter(s => s !== undefined).join(' ')
+    ]
+      .filter((s) => s !== undefined)
+      .join(' ')
     if (hasOther) args.push(other)
 
     if (this.opts.colors) {
@@ -277,23 +295,24 @@ export class Log extends LogBase {
    * @param {string} str
    * @param {Function} [cb]
    */
-  _sendLog (str, cb) {
+  _sendLog(str, cb) {
     const img = new Image()
-    const done = () => { cb && cb() }
+    const done = () => {
+      cb && cb()
+    }
     img.onload = done
     img.onerror = done
     img.onabort = done
-    img.src = this.opts.url + '?id=' + random(6) + '&log=' + encodeURIComponent(str)
+    img.src =
+      this.opts.url + '?id=' + random(6) + '&log=' + encodeURIComponent(str)
   }
 
   /**
    * Add colors, style to string
    * @private
    */
-  _color (str) {
-    return this.opts.colors
-      ? `%c${str}%c`
-      : str
+  _color(str) {
+    return this.opts.colors ? `%c${str}%c` : str
   }
 }
 
diff --git a/src/browserLogs.js b/src/browserLogs.js
index 130147c..66f34dc 100644
--- a/src/browserLogs.js
+++ b/src/browserLogs.js
@@ -12,21 +12,21 @@ const gif = Buffer.from(
  * @param {string} url
  * @returns {object}
  */
-function parseQuery (url) {
+function parseQuery(url) {
   // eslint-disable-next-line no-unused-vars
   const [path, search] = url.split('?')
   return Object.fromEntries(new URLSearchParams(search))
 }
 
 class Loggers {
-  constructor (opts) {
+  constructor(opts) {
     const { maxSize = 100 } = opts || {}
 
     this.LogCls = opts?.Log || Log
     this.cache = new MapLRU(maxSize)
   }
 
-  get (name) {
+  get(name) {
     let log = this.cache.get(name)
     if (!log) {
       log = new this.LogCls(name)
@@ -40,7 +40,7 @@ class Loggers {
  * @param {string|object} str
  * @returns {object}
  */
-function parseJson (str) {
+function parseJson(str) {
   if (typeof str === 'object') {
     return str
   }
@@ -70,7 +70,7 @@ function parseJson (str) {
  * @param {MwLogOption} [options]
  * @return {function} connect middleware
  */
-export function browserLogs (options) {
+export function browserLogs(options) {
   const opts = {
     maxSize: 100,
     logAll: false,
@@ -82,7 +82,7 @@ export function browserLogs (options) {
   const log = opts.logAll ? new LogCls('debug-level:browser') : undefined
   const loggers = new Loggers(opts)
 
-  return function _browserLogs (req, res) {
+  return function _browserLogs(req, res) {
     const query = req.query ? req.query : parseQuery(req.url)
 
     res.setHeader('Cache-Control', 'no-store, no-cache')
diff --git a/src/ecs/LogEcs.js b/src/ecs/LogEcs.js
index 541d077..7da0870 100644
--- a/src/ecs/LogEcs.js
+++ b/src/ecs/LogEcs.js
@@ -15,7 +15,7 @@ export class LogEcs extends Log {
    * @param {string} name logger namespace
    * @param {LogOptionsEcs} opts
    */
-  constructor (name, opts) {
+  constructor(name, opts) {
     const { serializers, ..._opts } = opts || {}
     super(name, {
       ..._opts,
@@ -28,7 +28,7 @@ export class LogEcs extends Log {
   }
 
   /* c8 ignore next 18 */
-  _applySerializers (obj) {
+  _applySerializers(obj) {
     const ecsObj = {}
     for (const key in obj) {
       const value = obj[key]
@@ -49,7 +49,7 @@ export class LogEcs extends Log {
     return ecsObj
   }
 
-  _toJson (obj, serializers) {
+  _toJson(obj, serializers) {
     const { level, time, name, msg, pid, hostname, diff, ...other } = obj
 
     const ecsObj = {
diff --git a/src/ecs/serializers.js b/src/ecs/serializers.js
index 1e8dbf1..65885cf 100644
--- a/src/ecs/serializers.js
+++ b/src/ecs/serializers.js
@@ -3,7 +3,7 @@ import { startTimeKey } from '../serializers/res.js'
 const isNotObject = (any) => !any || typeof any !== 'object'
 
 const ecsError = (err, ecsObj) => {
-  if (!(err?.message)) {
+  if (!err?.message) {
     return
   }
 
@@ -58,12 +58,14 @@ const ecsReq = (req, ecsObj) => {
   const { method, httpVersion } = req
   if (!method) return
 
+  /* eslint-disable no-unused-vars */
   const {
     cookie,
     authorization,
     'user-agent': userAgent,
     ...headers
   } = req.headers || {}
+  /* eslint-enable no-unused-vars */
 
   ecsObj.http = ecsObj.http || {}
   ecsObj.http.request = {
@@ -84,6 +86,7 @@ const ecsRes = (res, ecsObj) => {
   const { statusCode } = res
   if (!statusCode) return
 
+  /* eslint-disable no-unused-vars */
   const {
     'proxy-authenticate': _1,
     'set-cookie': _2,
@@ -91,6 +94,7 @@ const ecsRes = (res, ecsObj) => {
     cookie,
     ...headers
   } = res.getHeaders() || {}
+  /* eslint-enable no-unused-vars */
 
   ecsObj.http = ecsObj.http || {}
   ecsObj.http.response = {
diff --git a/src/httpLogs.js b/src/httpLogs.js
index 260f7ec..ac66344 100644
--- a/src/httpLogs.js
+++ b/src/httpLogs.js
@@ -33,7 +33,7 @@ const serializers = {
  * @param {LogOptionsHttpLog} [opts]
  * @returns {(req: IncomingMessageWithId, res: ServerResponse, next: Function) => void} connect middleware
  */
-export function httpLogs (namespace, opts) {
+export function httpLogs(namespace, opts) {
   const options = {
     Log,
     ...opts
@@ -47,7 +47,7 @@ export function httpLogs (namespace, opts) {
   const log = new options.Log(namespace || 'debug-level:http', options)
   const generateId = options.customGenerateRequestId || generateRequestId
 
-  return function _httpLogs (req, res, next) {
+  return function _httpLogs(req, res, next) {
     if (!req.id) {
       req.id = generateId()
     }
diff --git a/src/logger.js b/src/logger.js
index 7f738ea..bb27cba 100644
--- a/src/logger.js
+++ b/src/logger.js
@@ -10,7 +10,7 @@ const loggers = {}
  * @param {string} namespace
  * @param {LogOptions} [opts]
  */
-export function logger (namespace, opts) {
+export function logger(namespace, opts) {
   const { Log: optsLog, ..._opts } = opts || {}
   const LogCls = optsLog || Log
 
diff --git a/src/node.js b/src/node.js
index 3f0aeb1..995eb7d 100644
--- a/src/node.js
+++ b/src/node.js
@@ -81,7 +81,7 @@ export class Log extends LogBase {
    * @param {String} name - namespace of Logger
    * @param {LogOptions} [opts] - see Log.options
    */
-  constructor (name, opts) {
+  constructor(name, opts) {
     Object.assign(
       options,
       inspectOpts(process.env),
@@ -108,9 +108,9 @@ export class Log extends LogBase {
 
     this.stream = this.opts.sonic
       ? sonicStreams.use(this.opts.stream, {
-        minLength: this.opts.sonicLength,
-        timeout: this.opts.sonicFlushMs
-      })
+          minLength: this.opts.sonicLength,
+          timeout: this.opts.sonicFlushMs
+        })
       : this.opts.stream || process.stderr
 
     if (!this.opts.json) {
@@ -132,7 +132,7 @@ export class Log extends LogBase {
    * @param {object} [opts] changed options
    * @return {object} global options
    */
-  static options (opts) {
+  static options(opts) {
     if (!opts) {
       return { ...options }
     }
@@ -142,7 +142,7 @@ export class Log extends LogBase {
   /**
    * save options in `process.env`
    */
-  static save () {
+  static save() {
     Log.reset()
     saveOpts(process.env, options)
   }
@@ -150,7 +150,7 @@ export class Log extends LogBase {
   /**
    * reset saved options
    */
-  static reset () {
+  static reset() {
     Object.keys(process.env).forEach((key) => {
       if (/^(DEBUG|DEBUG_.*)$/.test(key)) {
         delete process.env[key]
@@ -165,7 +165,7 @@ export class Log extends LogBase {
    * @param {LogOptionWrapConsole} [opts] options
    * @return {function} unwrap function
    */
-  static wrapConsole (name = 'console', opts) {
+  static wrapConsole(name = 'console', opts) {
     const log = new Log(name, opts)
     return wrapConsole(log, opts)
   }
@@ -176,7 +176,7 @@ export class Log extends LogBase {
    * @param {string} [name='exit']
    * @param {LogOptionHandleExitEvents} [opts] options
    */
-  static handleExitEvents (name = 'exit', opts = {}) {
+  static handleExitEvents(name = 'exit', opts = {}) {
     const { code = 1, gracefulExit, ..._opts } = opts
     const log = new Log(name, _opts)
     EXIT_EVENTS.forEach((ev) => {
@@ -194,7 +194,7 @@ export class Log extends LogBase {
     })
   }
 
-  static wrapDebug () {
+  static wrapDebug() {
     return wrapDebug(Log)
   }
 
@@ -202,15 +202,15 @@ export class Log extends LogBase {
    * render string to output stream
    * @public
    * @param {String} str string to render
-   * @param {String} level level of log line (might be used for custom Logger which uses different streams per level)
+   * @param {String} [_level] level of log line (might be used for custom Logger which uses different streams per level)
    * @return {String}
    */
-  render (str, level) {
+  render(str, _level) {
     this.stream.write(flatstr(str + '\n'))
     return str
   }
 
-  flush () {
+  flush() {
     // @ts-expect-error
     this.stream.flush && this.stream.flush()
   }
@@ -219,7 +219,7 @@ export class Log extends LogBase {
    * format object to json
    * @protected
    */
-  _log (level, fmt, args) {
+  _log(level, fmt, args) {
     const o = this._formatJson(level, fmt, args)
     const str = this.toJson(o, this.serializers)
     return this.render(str, level)
@@ -229,7 +229,7 @@ export class Log extends LogBase {
    * format object to json
    * @private
    */
-  _logJsonColor (level, fmt, args) {
+  _logJsonColor(level, fmt, args) {
     const o = this._formatJson(level, fmt, args)
     let str = this.toJson(o, this.serializers)
     /* c8 ignore next 4 */ // can't cover with tests as underlying tty is unknown
@@ -248,9 +248,11 @@ export class Log extends LogBase {
    * debug like output if `this.opts.json === false`
    * @private
    */
-  _logDebugLike (_level, fmt, args) {
+  _logDebugLike(_level, fmt, args) {
     const o = this._formatJson(_level, fmt, args)
+    /* eslint-disable no-unused-vars */
     const { level, time, name, msg, pid, hostname, diff, ...other } = o
+    /* eslint-enable no-unused-vars */
 
     const prefix =
       '  ' +
@@ -260,9 +262,9 @@ export class Log extends LogBase {
 
     const strOther = Object.keys(other).length
       ? stringify(
-        this._applySerializers(other),
-        this.opts.splitLine ? this.opts.spaces ?? 2 : undefined
-      )
+          this._applySerializers(other),
+          this.opts.splitLine ? (this.opts.spaces ?? 2) : undefined
+        )
       : ''
 
     const str = this.opts.splitLine
@@ -297,7 +299,7 @@ export class Log extends LogBase {
    * Add colors, style to string
    * @private
    */
-  _color (str, color, isBold) {
+  _color(str, color, isBold) {
     return !this.opts.colors ? str : isBold ? color.bold(str) : color(str)
   }
 }
@@ -318,7 +320,7 @@ Log.serializers = {
  * @param {string} str
  * @returns {string}
  */
-function asString (str) {
+function asString(str) {
   let result = ''
   let last = 0
   let found = false
@@ -349,7 +351,7 @@ function asString (str) {
  * @param {number} [spaces]
  * @returns {string}
  */
-function toJson (obj, serializers, spaces) {
+function toJson(obj, serializers, spaces) {
   let s = '{'
   let comma = ''
   for (const key in obj) {
@@ -387,7 +389,7 @@ function toJson (obj, serializers, spaces) {
  * @param {number} [spaces]
  * @returns {string}
  */
-export function stringify (any, spaces) {
+export function stringify(any, spaces) {
   try {
     return JSON.stringify(any, null, spaces)
   } catch (e) {
@@ -400,6 +402,6 @@ export function stringify (any, spaces) {
  * @param {string} str
  * @returns {string}
  */
-function replaceLf (str = '') {
+function replaceLf(str = '') {
   return str.replace(/[\r\n]/g, '\\n')
 }
diff --git a/src/quick-format.js b/src/quick-format.js
index 020ff3e..dca9b4f 100644
--- a/src/quick-format.js
+++ b/src/quick-format.js
@@ -4,11 +4,15 @@
  * @copyright Copyright (c) 2016-2019 David Mark Clements
  */
 
-function tryStringify (value, replacer, spaces) {
-  try { return JSON.stringify(value, replacer, spaces) } catch (e) { return '"[Circular]"' }
+function tryStringify(value, replacer, spaces) {
+  try {
+    return JSON.stringify(value, replacer, spaces)
+  } catch (e) {
+    return '"[Circular]"'
+  }
 }
 
-export function format (f, args, opts, obj = {}) {
+export function format(f, args, opts, obj = {}) {
   const stringify = opts?.stringify || tryStringify
   const spaces = opts?.spaces
   const argLen = args.length
@@ -20,10 +24,11 @@ export function format (f, args, opts, obj = {}) {
     if (Array.isArray(val)) {
       Object.assign(obj, { arr: val })
     } else if (val instanceof Error) {
-    // } else if (val.stack && val.message && val.name) {
+      // } else if (val.stack && val.message && val.name) {
       if (!str) str = val.message
       Object.assign(obj, { err: val })
     } else {
+      // eslint-disable-next-line no-unused-vars
       const { name, level, ...other } = val
       Object.assign(obj, other)
     }
@@ -41,34 +46,47 @@ export function format (f, args, opts, obj = {}) {
 
     let lastPos = -1
     const flen = (f && f.length) || 0
-    for (let i = 0; i < flen;) {
+    for (let i = 0; i < flen; ) {
       if (f.charCodeAt(i) === 37 && i + 1 < flen) {
         lastPos = lastPos > -1 ? lastPos : 0
         switch (f.charCodeAt(i + 1)) {
           case 100: // 'd'
           case 102: // 'f'
-            if (a >= argLen) { break }
-            if (lastPos < i) { str += f.slice(lastPos, i) }
+            if (a >= argLen) {
+              break
+            }
+            if (lastPos < i) {
+              str += f.slice(lastPos, i)
+            }
             if (args[a] == null) break
             str += Number(args[a])
             lastPos = i = i + 2
             break
           case 105: // 'i'
-            if (a >= argLen) { break }
-            if (lastPos < i) { str += f.slice(lastPos, i) }
+            if (a >= argLen) {
+              break
+            }
+            if (lastPos < i) {
+              str += f.slice(lastPos, i)
+            }
             if (args[a] == null) break
             str += Math.floor(Number(args[a]))
             lastPos = i = i + 2
             break
           case 79: // 'O'
           case 111: // 'o'
-          case 106: { // 'j'
-            if (a >= argLen) { break }
-            if (lastPos < i) { str += f.slice(lastPos, i) }
+          case 106: {
+            // 'j'
+            if (a >= argLen) {
+              break
+            }
+            if (lastPos < i) {
+              str += f.slice(lastPos, i)
+            }
             if (args[a] === undefined) break
             const type = typeof args[a]
             if (type === 'string') {
-              str += '\'' + args[a] + '\''
+              str += "'" + args[a] + "'"
               lastPos = i + 2
               i++
               break
@@ -85,14 +103,20 @@ export function format (f, args, opts, obj = {}) {
             break
           }
           case 115: // 's'
-            if (a >= argLen) { break }
-            if (lastPos < i) { str += f.slice(lastPos, i) }
+            if (a >= argLen) {
+              break
+            }
+            if (lastPos < i) {
+              str += f.slice(lastPos, i)
+            }
             str += String(args[a])
             lastPos = i + 2
             i++
             break
           case 37: // '%'
-            if (lastPos < i) { str += f.slice(lastPos, i) }
+            if (lastPos < i) {
+              str += f.slice(lastPos, i)
+            }
             str += '%'
             lastPos = i + 2
             i++
diff --git a/src/serializers/err.js b/src/serializers/err.js
index 6c240a2..4feb827 100644
--- a/src/serializers/err.js
+++ b/src/serializers/err.js
@@ -5,16 +5,17 @@ const circ = Symbol('circ')
  * @param {object} [err]
  * @returns {object}
  */
-export function errSerializer (err) {
+export function errSerializer(err) {
   if (!(err instanceof Error)) {
     return err
   }
 
   const o = {
     msg: err.message,
-    name: Object.prototype.toString.call(err.constructor) === '[object Function]'
-      ? err.constructor.name
-      : err.name,
+    name:
+      Object.prototype.toString.call(err.constructor) === '[object Function]'
+        ? err.constructor.name
+        : err.name,
     stack: err.stack
   }
   err[circ] = undefined
diff --git a/src/serializers/req.js b/src/serializers/req.js
index 4dc90f7..bdf14ce 100644
--- a/src/serializers/req.js
+++ b/src/serializers/req.js
@@ -5,9 +5,10 @@
  * @param {object} [req]
  * @returns {object}
  */
-export function reqSerializer (req) {
+export function reqSerializer(req) {
   if (typeof req !== 'object' || !req) return
 
+  // eslint-disable-next-line no-unused-vars
   const { authorization, cookie, ...headers } = req.headers || {}
 
   const logReq = {
@@ -31,7 +32,7 @@ export function reqSerializer (req) {
  * @param {object} [req]
  * @returns {object}
  */
-export function reqMaskSerializer (req) {
+export function reqMaskSerializer(req) {
   const logReq = reqSerializer(req)
 
   if (!logReq) return
@@ -57,7 +58,7 @@ export function reqMaskSerializer (req) {
  * @param {string} cookie
  * @returns {string}
  */
-function maskCookieVal (cookie) {
+function maskCookieVal(cookie) {
   let masked = ''
   const len = cookie.length
   let mask = false
diff --git a/src/serializers/res.js b/src/serializers/res.js
index d87fe17..7167ba9 100644
--- a/src/serializers/res.js
+++ b/src/serializers/res.js
@@ -10,14 +10,16 @@ const PROXY_AUTHENTICATE = 'proxy-authenticate'
  * @param {object} [res]
  * @returns {object}
  */
-export function resSerializer (res) {
+export function resSerializer(res) {
   if (typeof res !== 'object' || !res) return
 
+  /* eslint-disable no-unused-vars */
   const {
     [SET_COOKIE]: _1,
     [PROXY_AUTHENTICATE]: _2,
     ...headers
   } = res.getHeaders() || {}
+  /* eslint-enable no-unused-vars */
 
   const logRes = {
     statusCode: res.statusCode
@@ -39,7 +41,7 @@ export function resSerializer (res) {
  * @param {object} [res]
  * @returns {object}
  */
-export function resMaskSerializer (res) {
+export function resMaskSerializer(res) {
   const logRes = resSerializer(res)
 
   if (!logRes) return
@@ -67,7 +69,7 @@ export function resMaskSerializer (res) {
  * @param {string} cookie
  * @returns {string}
  */
-function maskCookieVal (cookie) {
+function maskCookieVal(cookie) {
   let masked = ''
   const len = cookie.length
   let mask = false
diff --git a/src/utils.js b/src/utils.js
index ca02bd8..63eeebc 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -33,16 +33,43 @@ export const LEVELS = {
 }
 
 export const COLORS = [
-  '#6600FF', '#3333FF', '#3333CC', '#0066FF',
-  '#0066CC', '#0066FF',
-  '#006633', '#006666', '#006600',
-  '#00CC00', '#00CC33', '#00CC66', '#00CC99',
-  '#009900', '#009933', '#009966', '#009999',
-  '#00CCFF', '#00CCCC',
-  '#FF9900', '#FF9933', '#FF6600', '#FF6633',
-  '#FF0000', '#FF0033', '#FF3300', '#FF3300', '#FF3333',
-  '#CC0000', '#CC0033', '#CC0066', '#FF0066', '#FF3366',
-  '#FF00FF', '#FF33FF', '#CC00CC', '#990099'
+  '#6600FF',
+  '#3333FF',
+  '#3333CC',
+  '#0066FF',
+  '#0066CC',
+  '#0066FF',
+  '#006633',
+  '#006666',
+  '#006600',
+  '#00CC00',
+  '#00CC33',
+  '#00CC66',
+  '#00CC99',
+  '#009900',
+  '#009933',
+  '#009966',
+  '#009999',
+  '#00CCFF',
+  '#00CCCC',
+  '#FF9900',
+  '#FF9933',
+  '#FF6600',
+  '#FF6633',
+  '#FF0000',
+  '#FF0033',
+  '#FF3300',
+  '#FF3300',
+  '#FF3333',
+  '#CC0000',
+  '#CC0033',
+  '#CC0066',
+  '#FF0066',
+  '#FF3366',
+  '#FF00FF',
+  '#FF33FF',
+  '#CC00CC',
+  '#990099'
 ]
 
 export const LEVEL_COLORS = {
@@ -96,40 +123,44 @@ export const fromNumLevel = (level) => {
  * @copyright debug contributors
  * @see https://github.com/visionmedia/debug
  */
-export const inspectOpts = (obj) => Object.keys(obj)
-  .filter((key) => /^debug_/i.test(key))
-  .reduce((opts, key) => {
-    // camel-case
-    const prop = key
-      .substring(6)
-      .toLowerCase()
-      .replace(/_([a-z])/g, function (_, k) { return k.toUpperCase() })
-
-    // coerce string value into JS value
-    let val = obj[key]
-    if (/^(yes|on|true|enabled)$/i.test(val)) val = true
-    else if (/^(no|off|false|disabled)$/i.test(val)) val = false
-    else if (val === 'null') val = null
-    else val = Number(val)
-
-    if (prop === 'stream' || prop === 'formatters') {
-      // do nothing
-    } else if (prop === 'level') {
-      val = adjustLevel(obj[key])
-      if (val) opts[prop] = val
-    } else if (prop === 'url' || prop === 'timestamp') {
-      opts[prop] = obj[key]
-    } else {
-      opts[prop] = val
-    }
+export const inspectOpts = (obj) =>
+  Object.keys(obj)
+    .filter((key) => /^debug_/i.test(key))
+    .reduce((opts, key) => {
+      // camel-case
+      const prop = key
+        .substring(6)
+        .toLowerCase()
+        .replace(/_([a-z])/g, function (_, k) {
+          return k.toUpperCase()
+        })
+
+      // coerce string value into JS value
+      let val = obj[key]
+      if (/^(yes|on|true|enabled)$/i.test(val)) val = true
+      else if (/^(no|off|false|disabled)$/i.test(val)) val = false
+      else if (val === 'null') val = null
+      else val = Number(val)
+
+      if (prop === 'stream' || prop === 'formatters') {
+        // do nothing
+      } else if (prop === 'level') {
+        val = adjustLevel(obj[key])
+        if (val) opts[prop] = val
+      } else if (prop === 'url' || prop === 'timestamp') {
+        opts[prop] = obj[key]
+      } else {
+        opts[prop] = val
+      }
 
-    return opts
-  }, {})
+      return opts
+    }, {})
 
 export const saveOpts = (obj, options) => {
   Object.keys(options).forEach((prop) => {
     if (['stream', 'serializers', 'toJson'].includes(prop)) return // do not safe stream option
-    let key = 'DEBUG_' + prop.replace(/([A-Z])/g, (_, prop) => '_' + prop.toLowerCase())
+    let key =
+      'DEBUG_' + prop.replace(/([A-Z])/g, (_, prop) => '_' + prop.toLowerCase())
     if (prop === 'namespaces') key = 'DEBUG'
     key = key.toUpperCase()
     obj[key] = options[prop]
@@ -140,7 +171,7 @@ export const selectColor = (namespace, fn) => {
   let hash = 0
 
   for (const i in namespace) {
-    hash = ((hash << 5) - hash) + namespace.charCodeAt(i)
+    hash = (hash << 5) - hash + namespace.charCodeAt(i)
     hash |= 0 // Convert to 32bit integer
   }
 
@@ -150,11 +181,10 @@ export const selectColor = (namespace, fn) => {
 }
 
 export const levelColors = (fn) => {
-  const colors = Object.keys(LEVEL_COLORS)
-    .reduce((colors, level) => {
-      colors[level] = fn(LEVEL_COLORS[level])
-      return colors
-    }, {})
+  const colors = Object.keys(LEVEL_COLORS).reduce((colors, level) => {
+    colors[level] = fn(LEVEL_COLORS[level])
+    return colors
+  }, {})
   return colors
 }
 
@@ -163,4 +193,5 @@ export const inspectNamespaces = (obj) => {
   if (namespaces) return { namespaces }
 }
 
-export const random = (len) => Math.random().toString(16).toLowerCase().slice(2, len)
+export const random = (len) =>
+  Math.random().toString(16).toLowerCase().slice(2, len)
diff --git a/src/wrapConsole.js b/src/wrapConsole.js
index 96ba700..3ce4e1d 100644
--- a/src/wrapConsole.js
+++ b/src/wrapConsole.js
@@ -6,7 +6,7 @@ let wrapped = null
 
 const unwrap = () => {
   if (wrapped) {
-    LEVELS.forEach(level => {
+    LEVELS.forEach((level) => {
       console[level] = wrapped[level]
     })
     wrapped = null
@@ -18,21 +18,21 @@ const unwrap = () => {
  * console.log, console.info, console.warn, console.error
  * @return unwrap function
  */
-export function wrapConsole (log, { level4log = 'LOG' } = {}) {
+export function wrapConsole(log, { level4log = 'LOG' } = {}) {
   if (wrapped) return unwrap
   wrapped = {}
 
   const _level4log = adjustLevel(level4log, 'LOG').toLowerCase()
 
-  const render = level => (...args) => {
-    log[level](...args)
-  }
+  const render =
+    (level) =>
+    (...args) => {
+      log[level](...args)
+    }
 
-  LEVELS.map(l => l.toLowerCase()).forEach(level => {
+  LEVELS.map((l) => l.toLowerCase()).forEach((level) => {
     wrapped[level] = console[level]
-    const renderLevel = level === 'log'
-      ? _level4log
-      : level
+    const renderLevel = level === 'log' ? _level4log : level
     console[level] = render(renderLevel)
   })
 
diff --git a/src/wrapDebug.js b/src/wrapDebug.js
index f526603..ae7dcc7 100644
--- a/src/wrapDebug.js
+++ b/src/wrapDebug.js
@@ -4,21 +4,21 @@ let wrapped = null
 
 const unwrap = () => {
   if (wrapped) {
-    Object.keys(wrapped).forEach(key => {
+    Object.keys(wrapped).forEach((key) => {
       debug[key] = wrapped[key]
     })
     wrapped = null
   }
 }
 
-export function wrapDebug (Log) {
+export function wrapDebug(Log) {
   if (wrapped) return unwrap
   class Loggers {
-    constructor () {
+    constructor() {
       this.cache = {}
     }
 
-    get (namespace) {
+    get(namespace) {
       let logger = this.cache[namespace]
       if (!logger) {
         logger = this.cache[namespace] = new Log(namespace)
diff --git a/test/LogEcs.test.js b/test/LogEcs.test.js
index 6f5882e..a2a1479 100644
--- a/test/LogEcs.test.js
+++ b/test/LogEcs.test.js
@@ -110,6 +110,7 @@ describe('LogEcs', function () {
       })
 
       it('shall serialize a request with originalUrl', function () {
+        // eslint-disable-next-line no-unused-vars
         const { host, ...headers } = req.headers
         const _req = {
           ...req,
@@ -235,7 +236,12 @@ describe('LogEcs', function () {
 
       before(() => {
         clock = sinon.useFakeTimers()
-        LogEcs.options({ level: 'error', json: false, colors: false, namespaces: 'test*' })
+        LogEcs.options({
+          level: 'error',
+          json: false,
+          colors: false,
+          namespaces: 'test*'
+        })
         log = new LogEcs('test', { timestamp: 'iso' })
       })
 
diff --git a/test/Sonic.test.js b/test/Sonic.test.js
index 0e3752b..6b742e6 100644
--- a/test/Sonic.test.js
+++ b/test/Sonic.test.js
@@ -27,7 +27,7 @@ describe('Sonic', function () {
 
   it('shall throw if no stream is setup', function () {
     assert.throws(() => {
-      new Sonic() // eslint-disable-line no-new
+      new Sonic()
     }, /TypeError: Cannot destructure property/)
   })
 
@@ -60,7 +60,8 @@ describe('Sonic', function () {
   })
 
   it('broken pipe', async function () {
-    const sleep = (ms = 1) => new Promise((resolve) => setTimeout(() => resolve(), ms))
+    const sleep = (ms = 1) =>
+      new Promise((resolve) => setTimeout(() => resolve(), ms))
 
     const fsStream = fs.createWriteStream('/dev/null')
     const stream = new Sonic(fsStream)
diff --git a/test/browser.test.js b/test/browser.test.js
index 599656f..d546779 100644
--- a/test/browser.test.js
+++ b/test/browser.test.js
@@ -46,7 +46,12 @@ bdescribe('#Log', function () {
     })
 
     it('should set options', function () {
-      Log.options({ level: 'error', colors: false, url: 'http://localhost:3000/log', namespaces: 'foo*,bar' })
+      Log.options({
+        level: 'error',
+        colors: false,
+        url: 'http://localhost:3000/log',
+        namespaces: 'foo*,bar'
+      })
       const res = Log.options()
       assert.deepStrictEqual(res, {
         level: 'error',
@@ -57,7 +62,12 @@ bdescribe('#Log', function () {
     })
 
     it('should save options', function () {
-      Log.options({ level: 'ERROR', url: undefined, colors: true, namespaces: 'foo*,bar' })
+      Log.options({
+        level: 'ERROR',
+        url: undefined,
+        colors: true,
+        namespaces: 'foo*,bar'
+      })
       Log.save()
       const store = window.localStorage
       const res = Object.keys(store)
@@ -80,12 +90,12 @@ bdescribe('#Log', function () {
 
     const tests = [
       [undefined, { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      ['DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      ['INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-      ['WARN',    { fatal: 1, error: 1, warn: 1 }],
-      ['ERROR',   { fatal: 1, error: 1 }],
-      ['FATAL',   { fatal: 1 }],
-      ['OFF',     {}]
+      ['DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+      ['INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+      ['WARN', { fatal: 1, error: 1, warn: 1 }],
+      ['ERROR', { fatal: 1, error: 1 }],
+      ['FATAL', { fatal: 1 }],
+      ['OFF', {}]
     ]
     tests.forEach(([level, expects]) => {
       it('shall display logs for level ' + level, function () {
@@ -116,12 +126,12 @@ bdescribe('#Log', function () {
 
       const tests = [
         [undefined, {}],
-        ['DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-        ['INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-        ['WARN',    { fatal: 1, error: 1, warn: 1 }],
-        ['ERROR',   { fatal: 1, error: 1 }],
-        ['FATAL',   { fatal: 1 }],
-        ['OFF',     {}]
+        ['DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+        ['INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+        ['WARN', { fatal: 1, error: 1, warn: 1 }],
+        ['ERROR', { fatal: 1, error: 1 }],
+        ['FATAL', { fatal: 1 }],
+        ['OFF', {}]
       ]
       tests.forEach(([level, expects]) => {
         it('shall display logs for level ' + level, function () {
@@ -152,20 +162,24 @@ bdescribe('#Log', function () {
 
     const tests = [
       // level,   nsLevel,   expects
-      [undefined, undefined, { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      [undefined, 'DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      [undefined, 'INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-      [undefined, 'WARN',    { fatal: 1, error: 1, warn: 1 }],
-      [undefined, 'ERROR',   { fatal: 1, error: 1 }],
-      [undefined, 'FATAL',   { fatal: 1 }],
-      [undefined, 'OFF',     {}],
-      ['ERROR',   undefined, { fatal: 1, error: 1 }],
-      ['ERROR',   'DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      ['ERROR',   'INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-      ['ERROR',   'WARN',    { fatal: 1, error: 1, warn: 1 }],
-      ['ERROR',   'ERROR',   { fatal: 1, error: 1 }],
-      ['FATAL',   'FATAL',   { fatal: 1 }],
-      ['ERROR',   'OFF',     {}]
+      [
+        undefined,
+        undefined,
+        { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }
+      ],
+      [undefined, 'DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+      [undefined, 'INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+      [undefined, 'WARN', { fatal: 1, error: 1, warn: 1 }],
+      [undefined, 'ERROR', { fatal: 1, error: 1 }],
+      [undefined, 'FATAL', { fatal: 1 }],
+      [undefined, 'OFF', {}],
+      ['ERROR', undefined, { fatal: 1, error: 1 }],
+      ['ERROR', 'DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+      ['ERROR', 'INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+      ['ERROR', 'WARN', { fatal: 1, error: 1, warn: 1 }],
+      ['ERROR', 'ERROR', { fatal: 1, error: 1 }],
+      ['FATAL', 'FATAL', { fatal: 1 }],
+      ['ERROR', 'OFF', {}]
     ]
     tests.forEach(([level, nsLevel, expects]) => {
       it(`shall display logs for level ${level} using namespaced-level ${nsLevel}`, function () {
@@ -197,12 +211,30 @@ bdescribe('#Log', function () {
     after(reset)
 
     const tests = [
-      ['DEBUG', { fatal: true,  error: true,  warn: true,  info: true,  debug: true }],
-      ['INFO',  { fatal: true,  error: true,  warn: true,  info: true,  debug: false }],
-      ['WARN',  { fatal: true,  error: true,  warn: true,  info: false, debug: false }],
-      ['ERROR', { fatal: true,  error: true,  warn: false, info: false, debug: false }],
-      ['FATAL', { fatal: true,  error: false, warn: false, info: false, debug: false }],
-      ['OFF',   { fatal: false, error: false, warn: false, info: false, debug: false }]
+      [
+        'DEBUG',
+        { fatal: true, error: true, warn: true, info: true, debug: true }
+      ],
+      [
+        'INFO',
+        { fatal: true, error: true, warn: true, info: true, debug: false }
+      ],
+      [
+        'WARN',
+        { fatal: true, error: true, warn: true, info: false, debug: false }
+      ],
+      [
+        'ERROR',
+        { fatal: true, error: true, warn: false, info: false, debug: false }
+      ],
+      [
+        'FATAL',
+        { fatal: true, error: false, warn: false, info: false, debug: false }
+      ],
+      [
+        'OFF',
+        { fatal: false, error: false, warn: false, info: false, debug: false }
+      ]
     ]
     tests.forEach(([level, exp]) => {
       it('shall check if enabled for level ' + level, function () {
@@ -223,12 +255,13 @@ bdescribe('#Log', function () {
   describe('formats', function () {
     after(reset)
 
-    const fixErr = (args) => args.map(v => {
-      if (typeof v === 'object' && v.err) {
-        v.err = { name: 'Error' }
-      }
-      return v
-    })
+    const fixErr = (args) =>
+      args.map((v) => {
+        if (typeof v === 'object' && v.err) {
+          v.err = { name: 'Error' }
+        }
+        return v
+      })
 
     describe('debug like', function () {
       const f = fixtures.browser
@@ -252,14 +285,20 @@ bdescribe('#Log', function () {
       after(() => {
         clock.restore()
         if (WRITE) inspect(exp)
-        Object.keys(window.localStorage).forEach((i) => window.localStorage.removeItem(i))
+        Object.keys(window.localStorage).forEach((i) =>
+          window.localStorage.removeItem(i)
+        )
       })
 
       testcases.forEach(({ name, args }, idx) => {
         it(name, function () {
           const res = log.error(...args)
           if (WRITE) exp.push(res)
-          assert.deepStrictEqual(fixErr(res), fixErr(f[idx]), '[' + idx + '] ' + res + ' !== ' + f[idx])
+          assert.deepStrictEqual(
+            fixErr(res),
+            fixErr(f[idx]),
+            '[' + idx + '] ' + res + ' !== ' + f[idx]
+          )
         })
       })
     })
@@ -285,7 +324,11 @@ bdescribe('#Log', function () {
         it(name, function () {
           const res = log.error(...args)
           if (WRITE) exp.push(res)
-          assert.deepStrictEqual(fixErr(res), fixErr(f[idx]), '[' + idx + '] ' + res + ' !== ' + f[idx])
+          assert.deepStrictEqual(
+            fixErr(res),
+            fixErr(f[idx]),
+            '[' + idx + '] ' + res + ' !== ' + f[idx]
+          )
         })
       })
     })
@@ -325,12 +368,12 @@ bdescribe('#Log', function () {
     describe('namespace *', function () {
       const tests = [
         [undefined, { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-        ['DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-        ['INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-        ['WARN',    { fatal: 1, error: 1, warn: 1 }],
-        ['ERROR',   { fatal: 1, error: 1 }],
-        ['FATAL',   { fatal: 1 }],
-        ['OFF',     {}]
+        ['DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+        ['INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+        ['WARN', { fatal: 1, error: 1, warn: 1 }],
+        ['ERROR', { fatal: 1, error: 1 }],
+        ['FATAL', { fatal: 1 }],
+        ['OFF', {}]
       ]
       tests.forEach(([level, expects]) => {
         it(`shall ${level === 'OFF' ? 'never' : 'always'} log for level ${level}`, function () {
diff --git a/test/fixtures/Format.js b/test/fixtures/Format.js
index 7779c1b..903ed23 100644
--- a/test/fixtures/Format.js
+++ b/test/fixtures/Format.js
@@ -1,5 +1,6 @@
 const err = new TypeError('error message')
-err.stack = 'TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile' // shortened stack
+err.stack =
+  'TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile' // shortened stack
 err.status = 500
 
 export default {
diff --git a/test/fixtures/browser.js b/test/fixtures/browser.js
index 803e5ee..ad9d6ad 100644
--- a/test/fixtures/browser.js
+++ b/test/fixtures/browser.js
@@ -1,15 +1,12 @@
-import {
-  circular,
-  quotes,
-  custom
-} from './testcases.js'
+import { circular, quotes, custom } from './testcases.js'
 import { ua } from '../helpers/ua.js'
 
 const err = {
   err: {
     name: 'TypeError',
     message: 'error message',
-    stack: 'TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile',
+    stack:
+      'TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile',
     status: 500
   }
 }
@@ -44,11 +41,17 @@ export default {
     ['ERROR test obj {"object":{"test":1},"msg":"the message"} +0ms'],
     ['ERROR test obj [1,2,3] +0ms'],
     ua === 'firefox'
-      ? ['ERROR test error {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} +0ms']
+      ? [
+          'ERROR test error {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} +0ms'
+        ]
       : ['ERROR test error {"status":500} +0ms'],
     ua === 'firefox'
-      ? ['ERROR test mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} +0ms']
-      : ['ERROR test mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"status":500} +0ms'],
+      ? [
+          'ERROR test mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} +0ms'
+        ]
+      : [
+          'ERROR test mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"status":500} +0ms'
+        ],
     ['ERROR test error message %s %% %d string 1.1 %O +0ms', err],
     ['ERROR test the message %O +0ms', { ...err, ...obj }],
     ['ERROR test the message %O +0ms', { ...err, ...obj }],
@@ -57,39 +60,307 @@ export default {
     ['ERROR test with level +0ms']
   ],
   colors: [
-    ['%cERROR%c %ctest%c string %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c 1 %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c false %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c the message %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', obj, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c error message %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', err, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c string %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c 1 %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c false %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c the message %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', obj, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c the message %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', obj, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c  %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', { arr: [1, 2, 3] }, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c error message %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', err, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c  %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', circular, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c null %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c undefined %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c %d %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c %d %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c hello world %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c digit 42.7 %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c json {"object":{"test":1},"msg":"the message"} %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c obj {"object":{"test":1},"msg":"the message"} %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c obj [1,2,3] %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
+    [
+      '%cERROR%c %ctest%c string %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c 1 %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c false %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c the message %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      obj,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c error message %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      err,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c string %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c 1 %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c false %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c the message %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      obj,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c the message %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      obj,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c  %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      { arr: [1, 2, 3] },
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c error message %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      err,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c  %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      circular,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c null %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c undefined %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c %d %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c %d %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c hello world %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c digit 42.7 %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c json {"object":{"test":1},"msg":"the message"} %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c obj {"object":{"test":1},"msg":"the message"} %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c obj [1,2,3] %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ],
     ua === 'firefox'
-      ? ['%cERROR%c %ctest%c error {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit']
-      : ['%cERROR%c %ctest%c error {"status":500} %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
+      ? [
+          '%cERROR%c %ctest%c error {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} %c+0ms%c',
+          'color:#CC0000',
+          'color:inherit',
+          'color:#FF6600;font-weight:bold',
+          'color:inherit',
+          'color:#FF6600',
+          'color:inherit'
+        ]
+      : [
+          '%cERROR%c %ctest%c error {"status":500} %c+0ms%c',
+          'color:#CC0000',
+          'color:inherit',
+          'color:#FF6600;font-weight:bold',
+          'color:inherit',
+          'color:#FF6600',
+          'color:inherit'
+        ],
     ua === 'firefox'
-      ? ['%cERROR%c %ctest%c mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit']
-      : ['%cERROR%c %ctest%c mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"status":500} %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c error message %s %% %d string 1.1 %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', err, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c the message %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', { ...err, ...obj }, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c the message %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', { ...err, ...obj }, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c  %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', quotes, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c  %O %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', { req: custom }, 'color:#FF6600', 'color:inherit'],
-    ['%cERROR%c %ctest%c with level %c+0ms%c', 'color:#CC0000', 'color:inherit', 'color:#FF6600;font-weight:bold', 'color:inherit', 'color:#FF6600', 'color:inherit']
+      ? [
+          '%cERROR%c %ctest%c mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"stack":"TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile","status":500} %c+0ms%c',
+          'color:#CC0000',
+          'color:inherit',
+          'color:#FF6600;font-weight:bold',
+          'color:inherit',
+          'color:#FF6600',
+          'color:inherit'
+        ]
+      : [
+          '%cERROR%c %ctest%c mixed % string 1.1 2.2 3.33 {"object":{"test":1},"msg":"the message"} {"status":500} %c+0ms%c',
+          'color:#CC0000',
+          'color:inherit',
+          'color:#FF6600;font-weight:bold',
+          'color:inherit',
+          'color:#FF6600',
+          'color:inherit'
+        ],
+    [
+      '%cERROR%c %ctest%c error message %s %% %d string 1.1 %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      err,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c the message %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      { ...err, ...obj },
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c the message %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      { ...err, ...obj },
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c  %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      quotes,
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c  %O %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      { req: custom },
+      'color:#FF6600',
+      'color:inherit'
+    ],
+    [
+      '%cERROR%c %ctest%c with level %c+0ms%c',
+      'color:#CC0000',
+      'color:inherit',
+      'color:#FF6600;font-weight:bold',
+      'color:inherit',
+      'color:#FF6600',
+      'color:inherit'
+    ]
   ]
 }
diff --git a/test/fixtures/logEcs.js b/test/fixtures/logEcs.js
index 3807515..f55c0ec 100644
--- a/test/fixtures/logEcs.js
+++ b/test/fixtures/logEcs.js
@@ -4,81 +4,81 @@ export default {
     '  ERROR test 1970-01-01T00:00:00.001Z 1 +0ms',
     '  ERROR test 1970-01-01T00:00:00.002Z false +1ms',
     '  ERROR test 1970-01-01T00:00:00.003Z the message {\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "object": {\n' +
-    '  ERROR test         "test": 1\n' +
-    '  ERROR test       }\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "object": {\n' +
+      '  ERROR test         "test": 1\n' +
+      '  ERROR test       }\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.004Z error message {\n' +
-    '  ERROR test   "error": {\n' +
-    '  ERROR test     "type": "TypeError",\n' +
-    '  ERROR test     "message": "error message",\n' +
-    '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "error": {\n' +
+      '  ERROR test     "type": "TypeError",\n' +
+      '  ERROR test     "message": "error message",\n' +
+      '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.005Z string +1ms',
     '  ERROR test 1970-01-01T00:00:00.006Z 1 +1ms',
     '  ERROR test 1970-01-01T00:00:00.007Z false +1ms',
     '  ERROR test 1970-01-01T00:00:00.008Z the message {\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "object": {\n' +
-    '  ERROR test         "test": 1\n' +
-    '  ERROR test       }\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "object": {\n' +
+      '  ERROR test         "test": 1\n' +
+      '  ERROR test       }\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.009Z the message {\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "object": {\n' +
-    '  ERROR test         "test": 1\n' +
-    '  ERROR test       }\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "object": {\n' +
+      '  ERROR test         "test": 1\n' +
+      '  ERROR test       }\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.010Z {\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "arr": [\n' +
-    '  ERROR test         1,\n' +
-    '  ERROR test         2,\n' +
-    '  ERROR test         3\n' +
-    '  ERROR test       ]\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "arr": [\n' +
+      '  ERROR test         1,\n' +
+      '  ERROR test         2,\n' +
+      '  ERROR test         3\n' +
+      '  ERROR test       ]\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.011Z error message {\n' +
-    '  ERROR test   "error": {\n' +
-    '  ERROR test     "type": "TypeError",\n' +
-    '  ERROR test     "message": "error message",\n' +
-    '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "error": {\n' +
+      '  ERROR test     "type": "TypeError",\n' +
+      '  ERROR test     "message": "error message",\n' +
+      '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.012Z {\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "a": {\n' +
-    '  ERROR test         "b": {\n' +
-    '  ERROR test           "c": 1\n' +
-    '  ERROR test         },\n' +
-    '  ERROR test         "e": "[Circular]"\n' +
-    '  ERROR test       },\n' +
-    '  ERROR test       "d": {\n' +
-    '  ERROR test         "a": {\n' +
-    '  ERROR test           "b": {\n' +
-    '  ERROR test             "c": 1\n' +
-    '  ERROR test           },\n' +
-    '  ERROR test           "e": "[Circular]"\n' +
-    '  ERROR test         },\n' +
-    '  ERROR test         "d": "[Circular]"\n' +
-    '  ERROR test       }\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "a": {\n' +
+      '  ERROR test         "b": {\n' +
+      '  ERROR test           "c": 1\n' +
+      '  ERROR test         },\n' +
+      '  ERROR test         "e": "[Circular]"\n' +
+      '  ERROR test       },\n' +
+      '  ERROR test       "d": {\n' +
+      '  ERROR test         "a": {\n' +
+      '  ERROR test           "b": {\n' +
+      '  ERROR test             "c": 1\n' +
+      '  ERROR test           },\n' +
+      '  ERROR test           "e": "[Circular]"\n' +
+      '  ERROR test         },\n' +
+      '  ERROR test         "d": "[Circular]"\n' +
+      '  ERROR test       }\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.013Z null +1ms',
     '  ERROR test 1970-01-01T00:00:00.014Z undefined +1ms',
     '  ERROR test 1970-01-01T00:00:00.015Z %d +1ms',
@@ -86,89 +86,89 @@ export default {
     '  ERROR test 1970-01-01T00:00:00.017Z hello world +1ms',
     '  ERROR test 1970-01-01T00:00:00.018Z digit 42.7 +1ms',
     '  ERROR test 1970-01-01T00:00:00.019Z json {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "msg": "the message"\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "msg": "the message"\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.020Z obj {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "msg": "the message"\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "msg": "the message"\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.021Z obj [\n' +
-    '  ERROR test   1,\n' +
-    '  ERROR test   2,\n' +
-    '  ERROR test   3\n' +
-    '  ERROR test ] +1ms',
+      '  ERROR test   1,\n' +
+      '  ERROR test   2,\n' +
+      '  ERROR test   3\n' +
+      '  ERROR test ] +1ms',
     '  ERROR test 1970-01-01T00:00:00.022Z error {\n' +
-    '  ERROR test   "status": 500\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "status": 500\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.023Z mixed % string 1.1 2.2 3.33 {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "msg": "the message"\n' +
-    '  ERROR test } {\n' +
-    '  ERROR test   "status": 500\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "msg": "the message"\n' +
+      '  ERROR test } {\n' +
+      '  ERROR test   "status": 500\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.024Z error message %s %% %d string 1.1 {\n' +
-    '  ERROR test   "error": {\n' +
-    '  ERROR test     "type": "TypeError",\n' +
-    '  ERROR test     "message": "error message",\n' +
-    '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "error": {\n' +
+      '  ERROR test     "type": "TypeError",\n' +
+      '  ERROR test     "message": "error message",\n' +
+      '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.025Z the message {\n' +
-    '  ERROR test   "error": {\n' +
-    '  ERROR test     "type": "TypeError",\n' +
-    '  ERROR test     "message": "error message",\n' +
-    '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "object": {\n' +
-    '  ERROR test         "test": 1\n' +
-    '  ERROR test       }\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "error": {\n' +
+      '  ERROR test     "type": "TypeError",\n' +
+      '  ERROR test     "message": "error message",\n' +
+      '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "object": {\n' +
+      '  ERROR test         "test": 1\n' +
+      '  ERROR test       }\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.026Z the message {\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "object": {\n' +
-    '  ERROR test         "test": 1\n' +
-    '  ERROR test       }\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "error": {\n' +
-    '  ERROR test     "type": "TypeError",\n' +
-    '  ERROR test     "message": "error message",\n' +
-    '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "object": {\n' +
+      '  ERROR test         "test": 1\n' +
+      '  ERROR test       }\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "error": {\n' +
+      '  ERROR test     "type": "TypeError",\n' +
+      '  ERROR test     "message": "error message",\n' +
+      '  ERROR test     "stack_trace": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile"\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.027Z {\n' +
-    '  ERROR test   "extra": {\n' +
-    '  ERROR test     "test": {\n' +
-    '  ERROR test       "7123000": 7123000,\n' +
-    '  ERROR test       "_abcdEF$01": "abcdef",\n' +
-    '  ERROR test       "0.1234": 0.1234,\n' +
-    '  ERROR test       "s p-a c e": "space",\n' +
-    '  ERROR test       "\\"\'``\\"": "\\"\'``\\"",\n' +
-    '  ERROR test       "\\"": "\\"",\n' +
-    '  ERROR test       "\'": "\'"\n' +
-    '  ERROR test     }\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "extra": {\n' +
+      '  ERROR test     "test": {\n' +
+      '  ERROR test       "7123000": 7123000,\n' +
+      '  ERROR test       "_abcdEF$01": "abcdef",\n' +
+      '  ERROR test       "0.1234": 0.1234,\n' +
+      '  ERROR test       "s p-a c e": "space",\n' +
+      '  ERROR test       "\\"\'``\\"": "\\"\'``\\"",\n' +
+      '  ERROR test       "\\"": "\\"",\n' +
+      '  ERROR test       "\'": "\'"\n' +
+      '  ERROR test     }\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.028Z {\n' +
-    '  ERROR test   "client": {\n' +
-    '  ERROR test     "ip": "10.10.10.10"\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "url": {\n' +
-    '  ERROR test     "path": "/test"\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "client": {\n' +
+      '  ERROR test     "ip": "10.10.10.10"\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "url": {\n' +
+      '  ERROR test     "path": "/test"\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.029Z with level +1ms'
   ],
   json: [
diff --git a/test/fixtures/node.js b/test/fixtures/node.js
index b196d91..83834e8 100644
--- a/test/fixtures/node.js
+++ b/test/fixtures/node.js
@@ -4,63 +4,63 @@ export default {
     '  ERROR test 1970-01-01T00:00:00.001Z 1 +0ms',
     '  ERROR test 1970-01-01T00:00:00.002Z false +1ms',
     '  ERROR test 1970-01-01T00:00:00.003Z the message {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.004Z error message {\n' +
-    '  ERROR test   "err": {\n' +
-    '  ERROR test     "msg": "error message",\n' +
-    '  ERROR test     "name": "TypeError",\n' +
-    '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
-    '  ERROR test     "status": 500\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "err": {\n' +
+      '  ERROR test     "msg": "error message",\n' +
+      '  ERROR test     "name": "TypeError",\n' +
+      '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
+      '  ERROR test     "status": 500\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.005Z string +1ms',
     '  ERROR test 1970-01-01T00:00:00.006Z 1 +1ms',
     '  ERROR test 1970-01-01T00:00:00.007Z false +1ms',
     '  ERROR test 1970-01-01T00:00:00.008Z the message {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.009Z the message {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.010Z {\n' +
-    '  ERROR test   "arr": [\n' +
-    '  ERROR test     1,\n' +
-    '  ERROR test     2,\n' +
-    '  ERROR test     3\n' +
-    '  ERROR test   ]\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "arr": [\n' +
+      '  ERROR test     1,\n' +
+      '  ERROR test     2,\n' +
+      '  ERROR test     3\n' +
+      '  ERROR test   ]\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.011Z error message {\n' +
-    '  ERROR test   "err": {\n' +
-    '  ERROR test     "msg": "error message",\n' +
-    '  ERROR test     "name": "TypeError",\n' +
-    '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
-    '  ERROR test     "status": 500\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "err": {\n' +
+      '  ERROR test     "msg": "error message",\n' +
+      '  ERROR test     "name": "TypeError",\n' +
+      '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
+      '  ERROR test     "status": 500\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.012Z {\n' +
-    '  ERROR test   "a": {\n' +
-    '  ERROR test     "b": {\n' +
-    '  ERROR test       "c": 1\n' +
-    '  ERROR test     },\n' +
-    '  ERROR test     "e": "[Circular]"\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "d": {\n' +
-    '  ERROR test     "a": {\n' +
-    '  ERROR test       "b": {\n' +
-    '  ERROR test         "c": 1\n' +
-    '  ERROR test       },\n' +
-    '  ERROR test       "e": "[Circular]"\n' +
-    '  ERROR test     },\n' +
-    '  ERROR test     "d": "[Circular]"\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "a": {\n' +
+      '  ERROR test     "b": {\n' +
+      '  ERROR test       "c": 1\n' +
+      '  ERROR test     },\n' +
+      '  ERROR test     "e": "[Circular]"\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "d": {\n' +
+      '  ERROR test     "a": {\n' +
+      '  ERROR test       "b": {\n' +
+      '  ERROR test         "c": 1\n' +
+      '  ERROR test       },\n' +
+      '  ERROR test       "e": "[Circular]"\n' +
+      '  ERROR test     },\n' +
+      '  ERROR test     "d": "[Circular]"\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.013Z null +1ms',
     '  ERROR test 1970-01-01T00:00:00.014Z undefined +1ms',
     '  ERROR test 1970-01-01T00:00:00.015Z %d +1ms',
@@ -68,78 +68,78 @@ export default {
     '  ERROR test 1970-01-01T00:00:00.017Z hello world +1ms',
     '  ERROR test 1970-01-01T00:00:00.018Z digit 42.7 +1ms',
     '  ERROR test 1970-01-01T00:00:00.019Z json {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "msg": "the message"\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "msg": "the message"\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.020Z obj {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "msg": "the message"\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "msg": "the message"\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.021Z obj [\n' +
-    '  ERROR test   1,\n' +
-    '  ERROR test   2,\n' +
-    '  ERROR test   3\n' +
-    '  ERROR test ] +1ms',
+      '  ERROR test   1,\n' +
+      '  ERROR test   2,\n' +
+      '  ERROR test   3\n' +
+      '  ERROR test ] +1ms',
     '  ERROR test 1970-01-01T00:00:00.022Z error {\n' +
-    '  ERROR test   "status": 500\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "status": 500\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.023Z mixed % string 1.1 2.2 3.33 {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "msg": "the message"\n' +
-    '  ERROR test } {\n' +
-    '  ERROR test   "status": 500\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "msg": "the message"\n' +
+      '  ERROR test } {\n' +
+      '  ERROR test   "status": 500\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.024Z error message %s %% %d string 1.1 {\n' +
-    '  ERROR test   "err": {\n' +
-    '  ERROR test     "msg": "error message",\n' +
-    '  ERROR test     "name": "TypeError",\n' +
-    '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
-    '  ERROR test     "status": 500\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "err": {\n' +
+      '  ERROR test     "msg": "error message",\n' +
+      '  ERROR test     "name": "TypeError",\n' +
+      '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
+      '  ERROR test     "status": 500\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.025Z the message {\n' +
-    '  ERROR test   "err": {\n' +
-    '  ERROR test     "msg": "error message",\n' +
-    '  ERROR test     "name": "TypeError",\n' +
-    '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
-    '  ERROR test     "status": 500\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "err": {\n' +
+      '  ERROR test     "msg": "error message",\n' +
+      '  ERROR test     "name": "TypeError",\n' +
+      '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
+      '  ERROR test     "status": 500\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.026Z the message {\n' +
-    '  ERROR test   "object": {\n' +
-    '  ERROR test     "test": 1\n' +
-    '  ERROR test   },\n' +
-    '  ERROR test   "err": {\n' +
-    '  ERROR test     "msg": "error message",\n' +
-    '  ERROR test     "name": "TypeError",\n' +
-    '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
-    '  ERROR test     "status": 500\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "object": {\n' +
+      '  ERROR test     "test": 1\n' +
+      '  ERROR test   },\n' +
+      '  ERROR test   "err": {\n' +
+      '  ERROR test     "msg": "error message",\n' +
+      '  ERROR test     "name": "TypeError",\n' +
+      '  ERROR test     "stack": "TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile",\n' +
+      '  ERROR test     "status": 500\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.027Z {\n' +
-    '  ERROR test   "7123000": 7123000,\n' +
-    '  ERROR test   "_abcdEF$01": "abcdef",\n' +
-    '  ERROR test   "0.1234": 0.1234,\n' +
-    '  ERROR test   "s p-a c e": "space",\n' +
-    '  ERROR test   "\\"\'``\\"": "\\"\'``\\"",\n' +
-    '  ERROR test   "\\"": "\\"",\n' +
-    '  ERROR test   "\'": "\'"\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "7123000": 7123000,\n' +
+      '  ERROR test   "_abcdEF$01": "abcdef",\n' +
+      '  ERROR test   "0.1234": 0.1234,\n' +
+      '  ERROR test   "s p-a c e": "space",\n' +
+      '  ERROR test   "\\"\'``\\"": "\\"\'``\\"",\n' +
+      '  ERROR test   "\\"": "\\"",\n' +
+      '  ERROR test   "\'": "\'"\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.028Z {\n' +
-    '  ERROR test   "req": {\n' +
-    '  ERROR test     "url": "/test",\n' +
-    '  ERROR test     "ip": "10.10.10.10"\n' +
-    '  ERROR test   }\n' +
-    '  ERROR test } +1ms',
+      '  ERROR test   "req": {\n' +
+      '  ERROR test     "url": "/test",\n' +
+      '  ERROR test     "ip": "10.10.10.10"\n' +
+      '  ERROR test   }\n' +
+      '  ERROR test } +1ms',
     '  ERROR test 1970-01-01T00:00:00.029Z with level +1ms'
   ],
   json: [
diff --git a/test/fixtures/testcases.js b/test/fixtures/testcases.js
index a191f64..69dda7e 100644
--- a/test/fixtures/testcases.js
+++ b/test/fixtures/testcases.js
@@ -1,11 +1,16 @@
 export const obj = { object: { test: 1 }, msg: 'the message' }
 
-export const objEnsure = { name: { test: 1 }, msg: 'with level', level: 'NONESENSE' }
+export const objEnsure = {
+  name: { test: 1 },
+  msg: 'with level',
+  level: 'NONESENSE'
+}
 
 export const arr = [1, 2, 3]
 
 export const err = new TypeError('error message')
-err.stack = 'TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile' // shortened stack
+err.stack =
+  'TypeError: error message at Object.<anonymous> (./test/node.test.js:9:13) at Module._compile' // shortened stack
 err.status = 500
 
 export const circular = { a: { b: { c: 1 } } }
@@ -19,11 +24,11 @@ export const quotes = {
   's p-a c e': 'space',
   '"\'``"': '"\'``"',
   '"': '"',
-  '\'': '\''
+  "'": "'"
 }
 
 class Custom {
-  constructor (url) {
+  constructor(url) {
     Object.assign(this, {
       url,
       ip: '10.10.10.10',
@@ -32,7 +37,7 @@ class Custom {
     })
   }
 
-  toJSON () {
+  toJSON() {
     const { url, ip } = this
     return { url, ip }
   }
@@ -64,7 +69,10 @@ export const testcases = [
   { name: 'obj %o', args: ['obj %o', obj] },
   { name: 'obj %O', args: ['obj %O', arr] },
   { name: 'error %O', args: ['error %O', err] },
-  { name: 'mixed %', args: ['mixed %% %s %d %d %d %j %O', 'string', 1.1, 2.2, 3.33, obj, err] },
+  {
+    name: 'mixed %',
+    args: ['mixed %% %s %d %d %d %j %O', 'string', 1.1, 2.2, 3.33, obj, err]
+  },
   { name: 'error %s %d', args: [err, '%s %% %d', 'string', 1.1] },
   { name: 'error obj %s %d', args: [err, obj, '%s %% %d', 'string', 1.1] },
   { name: '%s %d obj err', args: ['%s %% %d', 'string', 1.1, obj, err] },
diff --git a/test/helpers/describeBool.js b/test/helpers/describeBool.js
index 5e0a807..8680967 100644
--- a/test/helpers/describeBool.js
+++ b/test/helpers/describeBool.js
@@ -4,10 +4,10 @@
 
 const noop = () => {}
 
-export const describeBool = (trueish) => trueish ? describe : describe.skip
-describeBool.only = (trueish) => trueish ? describe.only : noop
-describeBool.skip = (trueish) => describe.skip
+export const describeBool = (trueish) => (trueish ? describe : describe.skip)
+describeBool.only = (trueish) => (trueish ? describe.only : noop)
+describeBool.skip = (_trueish) => describe.skip
 
-export const itBool = (trueish) => trueish ? it : it.skip
-itBool.only = (trueish) => trueish ? it.only : noop
-itBool.skip = (trueish) => it.skip
+export const itBool = (trueish) => (trueish ? it : it.skip)
+itBool.only = (trueish) => (trueish ? it.only : noop)
+itBool.skip = (_trueish) => it.skip
diff --git a/test/helpers/karma-test-middleware.cjs b/test/helpers/karma-test-middleware.cjs
index 477013e..562ce08 100644
--- a/test/helpers/karma-test-middleware.cjs
+++ b/test/helpers/karma-test-middleware.cjs
@@ -1,7 +1,7 @@
 const { browserLogs } = require('../..')
 const loggerMw = browserLogs()
 
-function factory () {
+function factory() {
   return function (req, res, next) {
     if (/^\/logger/.test(req.url)) {
       req.ip = req.ip || req.connection.remoteAddress
diff --git a/test/helpers/ua.js b/test/helpers/ua.js
index b93dc85..7c23acf 100644
--- a/test/helpers/ua.js
+++ b/test/helpers/ua.js
@@ -1,9 +1,7 @@
 export const ua = (() => {
   if (typeof globalThis.navigator !== 'undefined') {
     const ua = navigator.userAgent
-    return /firefox/i.test(ua)
-      ? 'firefox'
-      : 'chrome'
+    return /firefox/i.test(ua) ? 'firefox' : 'chrome'
   }
 })()
 
diff --git a/test/httpLog.test.js b/test/httpLog.test.js
index ad89247..f939296 100644
--- a/test/httpLog.test.js
+++ b/test/httpLog.test.js
@@ -19,7 +19,7 @@ describe('#httpLogs', function () {
       httpLogs()(req, res, () => {})
       res.end()
     }
-    return request(app, '/').then(res => {
+    return request(app, '/').then((res) => {
       assert.equal(res.statusCode, 200)
     })
   })
@@ -30,7 +30,7 @@ describe('#httpLogs', function () {
       res.statusCode = 400
       res.end()
     }
-    return request(app, '/400').then(res => {
+    return request(app, '/400').then((res) => {
       assert.equal(res.statusCode, 400)
     })
   })
@@ -41,7 +41,7 @@ describe('#httpLogs', function () {
       res.statusCode = 500
       res.end()
     }
-    return request(app, '/500').then(res => {
+    return request(app, '/500').then((res) => {
       assert.equal(res.statusCode, 500)
     })
   })
@@ -52,7 +52,7 @@ describe('#httpLogs', function () {
       res.writeHead(200)
       res.write(Array(10000).fill('...').join(''))
     }
-    request(app, '/abort').then(res => {
+    request(app, '/abort').then((res) => {
       res.on('data', () => {
         res.destroy()
         done()
@@ -61,7 +61,8 @@ describe('#httpLogs', function () {
   })
 
   it('log with custom req.id', function (done) {
-    const customGenerateRequestId = () => Date.now().toString(36) + Math.random().toString(36).slice(2, 6)
+    const customGenerateRequestId = () =>
+      Date.now().toString(36) + Math.random().toString(36).slice(2, 6)
     const mw = httpLogs('my-module:http', { customGenerateRequestId })
     const app = (req, res) => {
       mw(req, res, () => {})
@@ -73,19 +74,22 @@ describe('#httpLogs', function () {
   })
 })
 
-function request (app, path) {
+function request(app, path) {
   return new Promise((resolve) => {
     const server = http.createServer(app).listen(() => {
       const { port } = server.address()
-      const req = http.request({
-        method: 'GET',
-        hostname: 'localhost',
-        port,
-        path
-      }, (res) => {
-        resolve(res)
-        server.close()
-      })
+      const req = http.request(
+        {
+          method: 'GET',
+          hostname: 'localhost',
+          port,
+          path
+        },
+        (res) => {
+          resolve(res)
+          server.close()
+        }
+      )
       req.end()
     })
   })
diff --git a/test/node.test.js b/test/node.test.js
index dce236e..493bbf4 100644
--- a/test/node.test.js
+++ b/test/node.test.js
@@ -26,6 +26,7 @@ describe('Log node', function () {
     after(reset)
 
     it('should get default options', function () {
+      // eslint-disable-next-line no-unused-vars
       const { stream, serializers, toJson, ...res } = Log.options()
       assert.deepStrictEqual(res, {
         level: 'INFO',
@@ -44,7 +45,13 @@ describe('Log node', function () {
     })
 
     it('should set options', function () {
-      Log.options({ level: 'error', json: true, colors: false, namespaces: 'foo*,bar' })
+      Log.options({
+        level: 'error',
+        json: true,
+        colors: false,
+        namespaces: 'foo*,bar'
+      })
+      // eslint-disable-next-line no-unused-vars
       const { stream, serializers, toJson, ...res } = Log.options()
       assert.deepStrictEqual(res, {
         level: 'error',
@@ -63,7 +70,12 @@ describe('Log node', function () {
     })
 
     it('should save options', function () {
-      Log.options({ level: 'ERROR', json: true, colors: false, namespaces: 'foo*,bar' })
+      Log.options({
+        level: 'ERROR',
+        json: true,
+        colors: false,
+        namespaces: 'foo*,bar'
+      })
       Log.save()
       const res = Object.keys(process.env)
         .filter((env) => /^DEBUG/.test(env))
@@ -97,25 +109,44 @@ describe('Log node', function () {
       clock.restore()
     })
     it('should log no time', function () {
-      const log = new Log('test', { timestamp: false, colors: false, namespaces: '*' })
+      const log = new Log('test', {
+        timestamp: false,
+        colors: false,
+        namespaces: '*'
+      })
       const res = log.log('a log line')
       assert.strictEqual(res, '  LOG test a log line +0ms')
     })
 
     it('should log in iso time', function () {
-      const log = new Log('test', { timestamp: 'iso', colors: false, namespaces: '*' })
+      const log = new Log('test', {
+        timestamp: 'iso',
+        colors: false,
+        namespaces: '*'
+      })
       const res = log.log('a log line')
-      assert.strictEqual(res, '  LOG test 1970-01-01T00:01:26.000Z a log line +0ms')
+      assert.strictEqual(
+        res,
+        '  LOG test 1970-01-01T00:01:26.000Z a log line +0ms'
+      )
     })
 
     it('should log in epoch time', function () {
-      const log = new Log('test', { timestamp: 'epoch', colors: false, namespaces: '*' })
+      const log = new Log('test', {
+        timestamp: 'epoch',
+        colors: false,
+        namespaces: '*'
+      })
       const res = log.log('a log line')
       assert.strictEqual(res, '  LOG test 86000 a log line +0ms')
     })
 
     it('should log in unix time', function () {
-      const log = new Log('test', { timestamp: 'unix', colors: false, namespaces: '*' })
+      const log = new Log('test', {
+        timestamp: 'unix',
+        colors: false,
+        namespaces: '*'
+      })
       const res = log.log('a log line')
       assert.strictEqual(res, '  LOG test 86 a log line +0ms')
     })
@@ -126,13 +157,13 @@ describe('Log node', function () {
 
     const tests = [
       [undefined, { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      ['TRACE',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
-      ['DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      ['INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-      ['WARN',    { fatal: 1, error: 1, warn: 1 }],
-      ['ERROR',   { fatal: 1, error: 1 }],
-      ['FATAL',   { fatal: 1 }],
-      ['OFF',     {}]
+      ['TRACE', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
+      ['DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+      ['INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+      ['WARN', { fatal: 1, error: 1, warn: 1 }],
+      ['ERROR', { fatal: 1, error: 1 }],
+      ['FATAL', { fatal: 1 }],
+      ['OFF', {}]
     ]
     tests.forEach(([level, expects]) => {
       it('shall display logs for level ' + level, function () {
@@ -165,17 +196,22 @@ describe('Log node', function () {
 
       const tests = [
         [undefined, {}],
-        ['TRACE',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
-        ['DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-        ['INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-        ['WARN',    { fatal: 1, error: 1, warn: 1 }],
-        ['ERROR',   { fatal: 1, error: 1 }],
-        ['FATAL',   { fatal: 1 }],
-        ['OFF',     {}]
+        ['TRACE', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
+        ['DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+        ['INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+        ['WARN', { fatal: 1, error: 1, warn: 1 }],
+        ['ERROR', { fatal: 1, error: 1 }],
+        ['FATAL', { fatal: 1 }],
+        ['OFF', {}]
       ]
       tests.forEach(([level, expects]) => {
         it('shall display logs for level ' + level, function () {
-          Log.options({ level, namespaces: undefined, json: false, colors: true })
+          Log.options({
+            level,
+            namespaces: undefined,
+            json: false,
+            colors: true
+          })
           const log = new Log('test:' + (level || 'undefined').toLowerCase())
           const res = {
             trace: log.trace('test') ? 1 : undefined,
@@ -211,7 +247,12 @@ describe('Log node', function () {
 
       tests.forEach(([level, exp]) => {
         it('shall write levels as numbers for ' + level, function () {
-          const log = new Log('test', { levelNumbers: true, level: 'trace', json: true, colors: false })
+          const log = new Log('test', {
+            levelNumbers: true,
+            level: 'trace',
+            json: true,
+            colors: false
+          })
           const res = log[level]('test')
           assert.strictEqual(res, exp)
         })
@@ -224,22 +265,34 @@ describe('Log node', function () {
 
     const tests = [
       // level,   nsLevel,   expects
-      [undefined, undefined, { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      [undefined, 'TRACE',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
-      [undefined, 'DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      [undefined, 'INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-      [undefined, 'WARN',    { fatal: 1, error: 1, warn: 1 }],
-      [undefined, 'ERROR',   { fatal: 1, error: 1 }],
-      [undefined, 'FATAL',   { fatal: 1 }],
-      [undefined, 'OFF',     {}],
-      ['ERROR',   undefined, { fatal: 1, error: 1 }],
-      ['ERROR',   'TRACE',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
-      ['ERROR',   'DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-      ['ERROR',   'INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-      ['ERROR',   'WARN',    { fatal: 1, error: 1, warn: 1 }],
-      ['ERROR',   'ERROR',   { fatal: 1, error: 1 }],
-      ['FATAL',   'FATAL',   { fatal: 1 }],
-      ['ERROR',   'OFF',     {}]
+      [
+        undefined,
+        undefined,
+        { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }
+      ],
+      [
+        undefined,
+        'TRACE',
+        { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }
+      ],
+      [undefined, 'DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+      [undefined, 'INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+      [undefined, 'WARN', { fatal: 1, error: 1, warn: 1 }],
+      [undefined, 'ERROR', { fatal: 1, error: 1 }],
+      [undefined, 'FATAL', { fatal: 1 }],
+      [undefined, 'OFF', {}],
+      ['ERROR', undefined, { fatal: 1, error: 1 }],
+      [
+        'ERROR',
+        'TRACE',
+        { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }
+      ],
+      ['ERROR', 'DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+      ['ERROR', 'INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+      ['ERROR', 'WARN', { fatal: 1, error: 1, warn: 1 }],
+      ['ERROR', 'ERROR', { fatal: 1, error: 1 }],
+      ['FATAL', 'FATAL', { fatal: 1 }],
+      ['ERROR', 'OFF', {}]
     ]
     tests.forEach(([level, nsLevel, expects]) => {
       it(`shall display logs for level ${level} using namespaced-level ${nsLevel}`, function () {
@@ -276,13 +329,83 @@ describe('Log node', function () {
     after(reset)
 
     const tests = [
-      ['TRACE', { fatal: true,  error: true,  warn: true,  info: true,  debug: true, trace: true }],
-      ['DEBUG', { fatal: true,  error: true,  warn: true,  info: true,  debug: true, trace: false }],
-      ['INFO',  { fatal: true,  error: true,  warn: true,  info: true,  debug: false, trace: false }],
-      ['WARN',  { fatal: true,  error: true,  warn: true,  info: false, debug: false, trace: false }],
-      ['ERROR', { fatal: true,  error: true,  warn: false, info: false, debug: false, trace: false }],
-      ['FATAL', { fatal: true,  error: false, warn: false, info: false, debug: false, trace: false }],
-      ['OFF',   { fatal: false, error: false, warn: false, info: false, debug: false, trace: false }]
+      [
+        'TRACE',
+        {
+          fatal: true,
+          error: true,
+          warn: true,
+          info: true,
+          debug: true,
+          trace: true
+        }
+      ],
+      [
+        'DEBUG',
+        {
+          fatal: true,
+          error: true,
+          warn: true,
+          info: true,
+          debug: true,
+          trace: false
+        }
+      ],
+      [
+        'INFO',
+        {
+          fatal: true,
+          error: true,
+          warn: true,
+          info: true,
+          debug: false,
+          trace: false
+        }
+      ],
+      [
+        'WARN',
+        {
+          fatal: true,
+          error: true,
+          warn: true,
+          info: false,
+          debug: false,
+          trace: false
+        }
+      ],
+      [
+        'ERROR',
+        {
+          fatal: true,
+          error: true,
+          warn: false,
+          info: false,
+          debug: false,
+          trace: false
+        }
+      ],
+      [
+        'FATAL',
+        {
+          fatal: true,
+          error: false,
+          warn: false,
+          info: false,
+          debug: false,
+          trace: false
+        }
+      ],
+      [
+        'OFF',
+        {
+          fatal: false,
+          error: false,
+          warn: false,
+          info: false,
+          debug: false,
+          trace: false
+        }
+      ]
     ]
     tests.forEach(([level, exp]) => {
       it('shall check if enabled for level ' + level, function () {
@@ -312,7 +435,12 @@ describe('Log node', function () {
 
       before(() => {
         clock = sinon.useFakeTimers()
-        Log.options({ level: 'error', json: false, colors: false, namespaces: 'test*' })
+        Log.options({
+          level: 'error',
+          json: false,
+          colors: false,
+          namespaces: 'test*'
+        })
         log = new Log('test', { timestamp: 'iso' })
       })
 
@@ -342,14 +470,25 @@ describe('Log node', function () {
         const log = new Log('test:multiple', { level: 'DEBUG' })
         const msg = '1 test\n2 test\n3 test'
         const res = log.error(msg)
-        assert.strictEqual(res, '  ERROR test:multiple 1 test\n  ERROR test:multiple 2 test\n  ERROR test:multiple 3 test +0ms')
+        assert.strictEqual(
+          res,
+          '  ERROR test:multiple 1 test\n  ERROR test:multiple 2 test\n  ERROR test:multiple 3 test +0ms'
+        )
       })
 
       it('should not log over multiple lines', function () {
-        const log = new Log('test:multiple', { json: false, splitLine: false, level: 'DEBUG', time: false })
+        const log = new Log('test:multiple', {
+          json: false,
+          splitLine: false,
+          level: 'DEBUG',
+          time: false
+        })
         const msg = '1 test\n2 test\n3 test'
         const res = log.error(msg)
-        assert.strictEqual(res, '  ERROR test:multiple 1 test\\n2 test\\n3 test +0ms')
+        assert.strictEqual(
+          res,
+          '  ERROR test:multiple 1 test\\n2 test\\n3 test +0ms'
+        )
       })
     })
 
@@ -359,7 +498,13 @@ describe('Log node', function () {
 
       before(() => {
         clock = sinon.useFakeTimers()
-        Log.options({ level: 'error', namespaces: 'test*', json: true, colors: true, serverinfo: false })
+        Log.options({
+          level: 'error',
+          namespaces: 'test*',
+          json: true,
+          colors: true,
+          serverinfo: false
+        })
         log = new Log('test', { timestamp: 'epoch' })
       })
 
@@ -367,7 +512,7 @@ describe('Log node', function () {
         clock.restore()
       })
 
-      testcases.forEach(({ name, args }, idx) => {
+      testcases.forEach(({ name, args }, _idx) => {
         it(name, function () {
           const res = log.error(...args)
           clock.tick(1)
@@ -385,7 +530,13 @@ describe('Log node', function () {
 
       before(() => {
         clock = sinon.useFakeTimers()
-        Log.options({ level: 'error', namespaces: 'test*', json: true, colors: false, serverinfo: false })
+        Log.options({
+          level: 'error',
+          namespaces: 'test*',
+          json: true,
+          colors: false,
+          serverinfo: false
+        })
         log = new Log('test', { timestamp: 'epoch' })
       })
 
@@ -407,13 +558,23 @@ describe('Log node', function () {
       it('should NOT remove object only formatters', function () {
         const log = new Log('*')
         const res = log.error('%j ', { a: { b: 'c' } })
-        assert.strictEqual(res, '{"level":"ERROR","name":"*","msg":"{\\"a\\":{\\"b\\":\\"c\\"}} ","diff":0}')
+        assert.strictEqual(
+          res,
+          '{"level":"ERROR","name":"*","msg":"{\\"a\\":{\\"b\\":\\"c\\"}} ","diff":0}'
+        )
       })
 
       it('should log serverinfo and pid', function () {
-        const log = new Log('*', { level: undefined, serverinfo: true, json: true })
+        const log = new Log('*', {
+          level: undefined,
+          serverinfo: true,
+          json: true
+        })
         const res = log.error('test')
-        assert(res.indexOf('"hostname":"' + os.hostname()) !== -1, 'missing hostname')
+        assert(
+          res.indexOf('"hostname":"' + os.hostname()) !== -1,
+          'missing hostname'
+        )
         assert(res.indexOf('"pid":' + process.pid) !== -1, 'missing pid')
       })
 
@@ -424,18 +585,27 @@ describe('Log node', function () {
         err.stack = err.stack.substring(0, 20)
         const log = new Log('all')
         const res = log.log(err)
-        assert.strictEqual(res, '{"level":"LOG","name":"all","msg":"Baam","diff":0,"err":{"msg":"Baam","name":"Error","stack":"TEST_NAME: Baam\\n    ","level":"TEST_LEVEL"}}')
+        assert.strictEqual(
+          res,
+          '{"level":"LOG","name":"all","msg":"Baam","diff":0,"err":{"msg":"Baam","name":"Error","stack":"TEST_NAME: Baam\\n    ","level":"TEST_LEVEL"}}'
+        )
       })
 
       it('should stringify large string', function () {
         const largeString = new Array(150).fill('1').join('')
         const res = log.error({ largeString })
-        assert.strictEqual(res, '{"level":"ERROR","time":30,"name":"test","diff":1,"largeString":"111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111"}')
+        assert.strictEqual(
+          res,
+          '{"level":"ERROR","time":30,"name":"test","diff":1,"largeString":"111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111"}'
+        )
       })
 
       it('should remove infinite number and function', function () {
         const res = log.error({ number: Infinity, fn: () => {} })
-        assert.strictEqual(res, '{"level":"ERROR","time":30,"name":"test","diff":0}')
+        assert.strictEqual(
+          res,
+          '{"level":"ERROR","time":30,"name":"test","diff":0}'
+        )
       })
     })
   })
@@ -446,13 +616,13 @@ describe('Log node', function () {
     describe('namespace *', function () {
       const tests = [
         [undefined, { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-        ['TRACE',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
-        ['DEBUG',   { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
-        ['INFO',    { fatal: 1, error: 1, warn: 1, info: 1 }],
-        ['WARN',    { fatal: 1, error: 1, warn: 1 }],
-        ['ERROR',   { fatal: 1, error: 1 }],
-        ['FATAL',   { fatal: 1 }],
-        ['OFF',     {}]
+        ['TRACE', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1, trace: 1 }],
+        ['DEBUG', { fatal: 1, error: 1, warn: 1, info: 1, debug: 1 }],
+        ['INFO', { fatal: 1, error: 1, warn: 1, info: 1 }],
+        ['WARN', { fatal: 1, error: 1, warn: 1 }],
+        ['ERROR', { fatal: 1, error: 1 }],
+        ['FATAL', { fatal: 1 }],
+        ['OFF', {}]
       ]
       tests.forEach(([level, expects]) => {
         it('shall always log for level ' + level, function () {
@@ -496,7 +666,10 @@ describe('Log node', function () {
       const err = new Error('baamm')
       err.stack = 'Error: baam\n    at Context.<anonymous>'
       const res = log.error({ msg: 'boom', err })
-      assert.strictEqual(res, '{"level":"ERROR","name":"serialize","msg":"boom","diff":0,"err":{"msg":"baamm","name":"Error","stack":"Error: baam\\n    at Context.<anonymous>"}}')
+      assert.strictEqual(
+        res,
+        '{"level":"ERROR","name":"serialize","msg":"boom","diff":0,"err":{"msg":"baamm","name":"Error","stack":"Error: baam\\n    at Context.<anonymous>"}}'
+      )
     })
 
     it('shall log with custom serializer', function () {
@@ -505,11 +678,18 @@ describe('Log node', function () {
         const { foo } = val
         return foo
       }
-      const log = new Log('serialize', { json: true, colors: false, serializers: { my } })
+      const log = new Log('serialize', {
+        json: true,
+        colors: false,
+        serializers: { my }
+      })
       const err = new Error('baamm')
       err.stack = 'Error: baam\n    at Context.<anonymous>'
       const res = log.error({ msg: 'boom', my: { foo: 'bar', level: 42 }, err })
-      assert.strictEqual(res, '{"level":"ERROR","name":"serialize","msg":"boom","diff":0,"my":"bar","err":{"msg":"baamm","name":"Error","stack":"Error: baam\\n    at Context.<anonymous>"}}')
+      assert.strictEqual(
+        res,
+        '{"level":"ERROR","name":"serialize","msg":"boom","diff":0,"my":"bar","err":{"msg":"baamm","name":"Error","stack":"Error: baam\\n    at Context.<anonymous>"}}'
+      )
     })
   })
 
@@ -526,7 +706,12 @@ describe('Log node', function () {
   describe('wrap console', function () {
     let unwrap
     before(function () {
-      Log.options({ level: 'trace', namespaces: 'test', json: true, colors: true })
+      Log.options({
+        level: 'trace',
+        namespaces: 'test',
+        json: true,
+        colors: true
+      })
       unwrap = Log.wrapConsole('test')
     })
     after(function () {
diff --git a/test/quick-format.test.js b/test/quick-format.test.js
index 7719ba8..d59fb6b 100644
--- a/test/quick-format.test.js
+++ b/test/quick-format.test.js
@@ -57,7 +57,10 @@ describe('quick-format', function () {
     assert.strictEqual(format('%s', [undefined]), 'undefined')
     assert.strictEqual(format('%s', ['foo']), 'foo')
     assert.strictEqual(format('%s', ['"quoted"']), '"quoted"')
-    assert.strictEqual(format('%j', [{ s: '"quoted"' }]), '{"s":"\\"quoted\\""}')
+    assert.strictEqual(
+      format('%j', [{ s: '"quoted"' }]),
+      '{"s":"\\"quoted\\""}'
+    )
     assert.strictEqual(format('%s:%s', []), '%s:%s')
     assert.strictEqual(format('%s:%s', [undefined]), 'undefined:%s')
     assert.strictEqual(format('%s:%s', ['foo']), 'foo:%s')
@@ -74,13 +77,23 @@ describe('quick-format', function () {
     assert.strictEqual(format('foo %o', [{ foo: 'foo' }]), 'foo {"foo":"foo"}')
     assert.strictEqual(format('foo %O', [{ foo: 'foo' }]), 'foo {"foo":"foo"}')
     assert.strictEqual(format('foo %j', [{ foo: 'foo' }]), 'foo {"foo":"foo"}')
-    assert.strictEqual(format('foo %j %j', [{ foo: 'foo' }]), 'foo {"foo":"foo"} %j')
-    assert.strictEqual(format('foo %j', ['foo']), 'foo \'foo\'') // TODO: isn't this wrong?
-    assert.strictEqual(format('foo %j', [function foo () {}]), 'foo foo()')
+    assert.strictEqual(
+      format('foo %j %j', [{ foo: 'foo' }]),
+      'foo {"foo":"foo"} %j'
+    )
+    assert.strictEqual(format('foo %j', ['foo']), "foo 'foo'") // TODO: isn't this wrong?
+    assert.strictEqual(format('foo %j', [function foo() {}]), 'foo foo()')
     assert.strictEqual(format('foo %j', [function () {}]), 'foo <anonymous>()')
-    assert.strictEqual(format('foo %j', [{ foo: 'foo' }, 'not-printed']), 'foo {"foo":"foo"} not-printed')
     assert.strictEqual(
-      format('foo %j', [{ foo: 'foo' }], { stringify () { return 'REPLACED' } }),
+      format('foo %j', [{ foo: 'foo' }, 'not-printed']),
+      'foo {"foo":"foo"} not-printed'
+    )
+    assert.strictEqual(
+      format('foo %j', [{ foo: 'foo' }], {
+        stringify() {
+          return 'REPLACED'
+        }
+      }),
       'foo REPLACED'
     )
     const circularObject = {}
@@ -95,24 +108,38 @@ describe('quick-format', function () {
     assert.strictEqual(format('%%%s%%%%', ['hi']), '%hi%%')
   })
   it('functions', function () {
-    function test () {}
+    function test() {}
 
     assert.strictEqual(format(test, []), 'test()')
-    assert.strictEqual(format('%s', [test]), 'function test () {}')
+    assert.strictEqual(format('%s', [test]), 'function test() {}')
     assert.strictEqual(format('%s', ['hi', test]), 'hi test()')
 
-    assert.strictEqual(format(() => {}, []), '<anonymous>()')
+    assert.strictEqual(
+      format(() => {}, []),
+      '<anonymous>()'
+    )
     assert.strictEqual(format('%s', [() => {}]), '() => {}')
     assert.strictEqual(format('%s', ['hi', () => {}]), 'hi <anonymous>()')
   })
   it('object assignment', function () {
     const obj = {}
-    assert.strictEqual(format('%s%%%s', ['foo', 'bar', { hello: 'object' }, { test: 1 }], {}, obj), 'foo%bar')
+    assert.strictEqual(
+      format(
+        '%s%%%s',
+        ['foo', 'bar', { hello: 'object' }, { test: 1 }],
+        {},
+        obj
+      ),
+      'foo%bar'
+    )
     assert.deepStrictEqual(obj, { hello: 'object', test: 1 })
   })
   it('no formatter', function () {
     const obj = {}
-    assert.strictEqual(format({ hello: 'object' }, ['foo', 'bar', { test: 1 }], {}, obj), ' foo bar')
+    assert.strictEqual(
+      format({ hello: 'object' }, ['foo', 'bar', { test: 1 }], {}, obj),
+      ' foo bar'
+    )
     assert.deepStrictEqual(obj, { hello: 'object', test: 1 })
   })
   it('error', function () {
diff --git a/test/utils.test.js b/test/utils.test.js
index 4ef4b16..413025e 100644
--- a/test/utils.test.js
+++ b/test/utils.test.js
@@ -68,13 +68,25 @@ describe('#utils', function () {
 
   describe('numbered levels', function () {
     it('shall convert to numbered levels', function () {
-      const res = LEVELS.TRACE.concat(LOG, '##').map(l => toNumLevel(l))
+      const res = LEVELS.TRACE.concat(LOG, '##').map((l) => toNumLevel(l))
       assert.deepStrictEqual(res, [60, 50, 40, 30, 20, 10, 30, 20])
     })
 
     it('shall convert back to readable levels', function () {
-      const res = [101, 60, 51, 50, 40, 30, 20, 10, 0].map(l => fromNumLevel(l))
-      assert.deepStrictEqual(res, ['FATAL', 'FATAL', 'FATAL', 'ERROR', 'WARN', 'INFO', 'DEBUG', 'TRACE', 'TRACE'])
+      const res = [101, 60, 51, 50, 40, 30, 20, 10, 0].map((l) =>
+        fromNumLevel(l)
+      )
+      assert.deepStrictEqual(res, [
+        'FATAL',
+        'FATAL',
+        'FATAL',
+        'ERROR',
+        'WARN',
+        'INFO',
+        'DEBUG',
+        'TRACE',
+        'TRACE'
+      ])
     })
   })
 })
diff --git a/types/Format.d.ts b/types/Format.d.ts
index 06b77a1..3a2733c 100644
--- a/types/Format.d.ts
+++ b/types/Format.d.ts
@@ -6,7 +6,7 @@ export class Format {
     /**
      * @param {FormatOption} [opts]
      */
-    constructor(opts?: FormatOption | undefined);
+    constructor(opts?: FormatOption);
     opts: {
         spaces: number | undefined;
     };
diff --git a/types/LogBase.d.ts b/types/LogBase.d.ts
index bfa9ad4..b832981 100644
--- a/types/LogBase.d.ts
+++ b/types/LogBase.d.ts
@@ -32,19 +32,19 @@ export class LogBase {
     _timeF: any;
     _time: any;
     /** always logs */
-    log: (...args: any[]) => void;
+    log: (..._args: any[]) => void;
     /** log with level FATAL */
-    fatal: (...args: any[]) => void;
+    fatal: (..._args: any[]) => void;
     /** log with level ERROR */
-    error: (...args: any[]) => void;
+    error: (..._args: any[]) => void;
     /** log with level WARN */
-    warn: (...args: any[]) => void;
+    warn: (..._args: any[]) => void;
     /** log with level INFO */
-    info: (...args: any[]) => void;
+    info: (..._args: any[]) => void;
     /** log with level DEBUG */
-    debug: (...args: any[]) => void;
+    debug: (..._args: any[]) => void;
     /** log with level TRACE */
-    trace: (...args: any[]) => void;
+    trace: (..._args: any[]) => void;
     /** @type {number|undefined} */
     pid: number | undefined;
     /** @type {string|undefined} */
@@ -52,7 +52,7 @@ export class LogBase {
     /**
      * @param {string} [namespaces]
      */
-    enable(namespaces?: string | undefined): void;
+    enable(namespaces?: string): void;
     get enabled(): any;
     diff(): number;
     _prev: number | undefined;
@@ -65,7 +65,7 @@ export class LogBase {
     /**
      * @protected
      */
-    protected _log(nlevel: any, fmt: any, args: any): void;
+    protected _log(_nlevel: any, _fmt: any, _args: any): void;
 }
 export type Timestamp = "epoch" | "unix" | "iso";
 export type Level = import("./utils.js").Level;
diff --git a/types/Sonic.d.ts b/types/Sonic.d.ts
index 6316769..32b0e6b 100644
--- a/types/Sonic.d.ts
+++ b/types/Sonic.d.ts
@@ -34,7 +34,7 @@ export class SonicStreams extends Map<any, any> {
      * @param {SonicOptions} [opts]
      * @returns {Sonic}
      */
-    use(stream: NodeJS.WriteStream, opts?: SonicOptions | undefined): Sonic;
+    use(stream: NodeJS.WriteStream, opts?: SonicOptions): Sonic;
 }
 export const sonicStreams: SonicStreams;
 export type SonicOptions = {
diff --git a/types/browser.d.ts b/types/browser.d.ts
index 22caf61..44ee2e6 100644
--- a/types/browser.d.ts
+++ b/types/browser.d.ts
@@ -7,7 +7,7 @@ export class Log extends LogBase {
      * @param {LogOptionsBrowser} [opts] changed options
      * @return {object} global options
      */
-    static options(opts?: LogOptionsBrowser | undefined): object;
+    static options(opts?: LogOptionsBrowser): object;
     /**
      * save options in `localStorage`
      */
@@ -29,9 +29,9 @@ export class Log extends LogBase {
      * @param {LogOptionWrapConsole} [opts]
      * @return {function} unwrap function
      */
-    static wrapConsole(name?: string | undefined, opts?: (import("./Format.js").FormatOption & import("./LogBase.js").ExtLogBaseOptions & ExtLogOptionsBrowser & {
+    static wrapConsole(name?: string, opts?: import("./Format.js").FormatOption & import("./LogBase.js").ExtLogBaseOptions & ExtLogOptionsBrowser & {
         level4log?: import("./utils.js").Level | undefined;
-    }) | undefined): Function;
+    }): Function;
     /**
      * @param {string} name namespace of Logger
      * @param {LogOptionsBrowser} opts
@@ -86,17 +86,17 @@ export class Log extends LogBase {
      * render arguments to console.log
      * @public
      * @param {any[]} args console.log arguments
-     * @param {Level} level level of log line (might be used for custom Logger which uses different streams per level)
+     * @param {Level} [_level] level of log line (might be used for custom Logger which uses different streams per level)
      * @return {any[]}
      */
-    public render(args: any[], level: Level): any[];
+    public render(args: any[], _level?: Level): any[];
     /**
      * send log to server
      * @param {Level|object} level log level
      * @param {string} [fmt] formatter
      * @param {any[]} [args] log arguments
      */
-    send(level: Level | object, fmt?: string | undefined, args?: any[] | undefined): void;
+    send(level: Level | object, fmt?: string, args?: any[]): void;
     /**
      * format log arguments
      * @protected
@@ -105,7 +105,7 @@ export class Log extends LogBase {
     /**
      * format arguments for console.log
      * @private
-     * @param {object} param0
+     * @param {object} options
      * @return {Array} args for console.log
      */
     private _format;
@@ -114,7 +114,7 @@ export class Log extends LogBase {
      * @param {string} str
      * @param {Function} [cb]
      */
-    _sendLog(str: string, cb?: Function | undefined): void;
+    _sendLog(str: string, cb?: Function): void;
     /**
      * Add colors, style to string
      * @private
diff --git a/types/browserLogs.d.ts b/types/browserLogs.d.ts
index 729a2f4..5ee163c 100644
--- a/types/browserLogs.d.ts
+++ b/types/browserLogs.d.ts
@@ -16,7 +16,7 @@
  * @param {MwLogOption} [options]
  * @return {function} connect middleware
  */
-export function browserLogs(options?: MwLogOption | undefined): Function;
+export function browserLogs(options?: MwLogOption): Function;
 /**
  * - [maxSize=100] max number of different name loggers
  * - [logAll=false] log everything even strings
diff --git a/types/httpLogs.d.ts b/types/httpLogs.d.ts
index 6a3f68a..ed74eb5 100644
--- a/types/httpLogs.d.ts
+++ b/types/httpLogs.d.ts
@@ -18,7 +18,7 @@
  * @param {LogOptionsHttpLog} [opts]
  * @returns {(req: IncomingMessageWithId, res: ServerResponse, next: Function) => void} connect middleware
  */
-export function httpLogs(namespace?: string | undefined, opts?: LogOptionsHttpLog | undefined): (req: IncomingMessageWithId, res: ServerResponse, next: Function) => void;
+export function httpLogs(namespace?: string, opts?: LogOptionsHttpLog): (req: IncomingMessageWithId, res: ServerResponse, next: Function) => void;
 export type IncomingMessage = import("node:http").IncomingMessage;
 export type ServerResponse = import("node:http").ServerResponse;
 export type LogOptions = import("./node.js").LogOptions;
diff --git a/types/logger.d.ts b/types/logger.d.ts
index 8b5c9c1..a2bf18c 100644
--- a/types/logger.d.ts
+++ b/types/logger.d.ts
@@ -5,5 +5,5 @@
  * @param {string} namespace
  * @param {LogOptions} [opts]
  */
-export function logger(namespace: string, opts?: import("./index.js").LogOptions | undefined): any;
+export function logger(namespace: string, opts?: LogOptions): any;
 export type LogOptions = import("./index.js").LogOptions;
diff --git a/types/node.d.ts b/types/node.d.ts
index cac72e6..2eaa1d8 100644
--- a/types/node.d.ts
+++ b/types/node.d.ts
@@ -3,7 +3,7 @@
  * @param {number} [spaces]
  * @returns {string}
  */
-export function stringify(any: any, spaces?: number | undefined): string;
+export function stringify(any: any, spaces?: number): string;
 export class Log extends LogBase {
     /**
      * Apply (and get) global options
@@ -26,21 +26,21 @@ export class Log extends LogBase {
      * @param {LogOptionWrapConsole} [opts] options
      * @return {function} unwrap function
      */
-    static wrapConsole(name?: string | undefined, opts?: LogOptionWrapConsole | undefined): Function;
+    static wrapConsole(name?: string, opts?: LogOptionWrapConsole): Function;
     /**
      * log exit events like 'unhandledRejection', 'uncaughtException'
      * and then let the process die
      * @param {string} [name='exit']
      * @param {LogOptionHandleExitEvents} [opts] options
      */
-    static handleExitEvents(name?: string | undefined, opts?: LogOptionHandleExitEvents): void;
+    static handleExitEvents(name?: string, opts?: LogOptionHandleExitEvents): void;
     static wrapDebug(): () => void;
     /**
      * creates a new logger
      * @param {String} name - namespace of Logger
      * @param {LogOptions} [opts] - see Log.options
      */
-    constructor(name: string, opts?: LogOptions | undefined);
+    constructor(name: string, opts?: LogOptions);
     color: any;
     levColors: {};
     opts: {
@@ -112,10 +112,10 @@ export class Log extends LogBase {
      * render string to output stream
      * @public
      * @param {String} str string to render
-     * @param {String} level level of log line (might be used for custom Logger which uses different streams per level)
+     * @param {String} [_level] level of log line (might be used for custom Logger which uses different streams per level)
      * @return {String}
      */
-    public render(str: string, level: string): string;
+    public render(str: string, _level?: string): string;
     flush(): void;
     /**
      * format object to json
@@ -178,7 +178,7 @@ import { LogBase } from './LogBase.js';
  * @param {number} [spaces]
  * @returns {string}
  */
-declare function toJson(obj: object, serializers: object, spaces?: number | undefined): string;
+declare function toJson(obj: object, serializers: object, spaces?: number): string;
 import { Sonic } from './Sonic.js';
 declare const isDevEnv: boolean;
 import { errSerializer } from './serializers/index.js';