diff --git a/.eslintrc.yml b/.eslintrc.yml
index 8abc126b..b327b9bf 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -1,173 +1 @@
-env:
-  es6: true
-  node: true
-extends: 'eslint:recommended'
-globals:
-  metatests: false
-rules:
-  indent:
-    - error
-    - 2
-    - SwitchCase: 1
-      VariableDeclarator:
-        var: 2
-        let: 2
-        const: 3
-      MemberExpression: 1
-  linebreak-style:
-    - error
-    - unix
-  quotes:
-    - error
-    - single
-  semi:
-    - error
-    - always
-  eqeqeq:
-    - error
-    - always
-  no-loop-func:
-    - error
-  strict:
-    - error
-    - global
-  block-spacing:
-    - error
-    - always
-  brace-style:
-    - error
-    - 1tbs
-    - allowSingleLine: true
-  camelcase:
-    - error
-  comma-style:
-    - error
-    - last
-  comma-spacing:
-    - error
-    - before: false
-      after: true
-  eol-last:
-    - error
-  func-call-spacing:
-    - error
-    - never
-  key-spacing:
-    - error
-    - beforeColon: false
-      afterColon: true
-      mode: minimum
-  keyword-spacing:
-    - error
-    - before: true
-      after: true
-      overrides:
-        function:
-          after: false
-  max-len:
-    - error
-    - code: 80
-      ignoreUrls: true
-  max-nested-callbacks:
-    - error
-    - max: 7
-  new-cap:
-    - error
-    - newIsCap: true
-      capIsNew: true
-      properties: true
-  new-parens:
-    - error
-  no-lonely-if:
-    - error
-  no-trailing-spaces:
-    - error
-  no-unneeded-ternary:
-    - error
-  no-whitespace-before-property:
-    - error
-  object-curly-spacing:
-    - error
-    - always
-  operator-assignment:
-    - error
-    - always
-  operator-linebreak:
-    - error
-    - after
-  semi-spacing:
-    - error
-    - before: false
-      after: true
-  space-before-blocks:
-    - error
-    - always
-  space-before-function-paren:
-    - error
-    - never
-  space-in-parens:
-    - error
-    - never
-  space-infix-ops:
-    - error
-  space-unary-ops:
-    - error
-    - words: true
-      nonwords: false
-      overrides:
-        typeof: false
-  no-unreachable:
-    - error
-  no-global-assign:
-    - error
-  no-self-compare:
-    - error
-  no-unmodified-loop-condition:
-    - error
-  no-constant-condition:
-    - error
-    - checkLoops: false
-  no-console:
-    - off
-  no-useless-concat:
-    - error
-  no-useless-escape:
-    - error
-  no-shadow-restricted-names:
-    - error
-  no-use-before-define:
-    - error
-    - functions: false
-  arrow-body-style:
-    - error
-    - as-needed
-  arrow-spacing:
-    - error
-  no-confusing-arrow:
-    - error
-    - allowParens: true
-  no-useless-computed-key:
-    - error
-  no-useless-rename:
-    - error
-  no-var:
-    - error
-  object-shorthand:
-    - error
-    - always
-  prefer-arrow-callback:
-    - error
-  prefer-const:
-    - error
-  prefer-numeric-literals:
-    - error
-  prefer-rest-params:
-    - error
-  prefer-spread:
-    - error
-  rest-spread-spacing:
-    - error
-    - never
-  template-curly-spacing:
-    - error
-    - never
+extends: 'metarhia'
diff --git a/benchmarks/speed.js b/benchmarks/speed.js
index 85ced52c..d03a1900 100644
--- a/benchmarks/speed.js
+++ b/benchmarks/speed.js
@@ -17,7 +17,7 @@ const defineArrayOfNumber = () => [100500, 100500, 100500];
 const defineObject = () => ({
   hello: 'world',
   size: 100500,
-  flag: true
+  flag: true,
 });
 
 const mixinObject = () => {
@@ -77,5 +77,5 @@ metatests.speed('Benchmark example', 2000000, [
   newClass,
   newObject,
   objectCreate,
-  callFactory
+  callFactory,
 ]);
diff --git a/bin/cli.js b/bin/cli.js
index b1d8a6de..082d21e9 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -20,7 +20,7 @@ const cliOptions = [
   [ '--browsers <values>',       'Browsers to run', splitOpts, [] ],
   [ '-l, --browser-log <value>', 'Browser log level' ],
   [ '-p, --browser-port <n>',    'Browser port' ],
-  [ '-c, --config <value>',      'Config file' ]
+  [ '-c, --config <value>',      'Config file' ],
 ];
 
 const karmaLogLevels = {
@@ -28,7 +28,7 @@ const karmaLogLevels = {
   'error':   [ 'LOG_ERROR', 'errors-only' ],
   'warn':    [ 'LOG_WARN', 'minimal' ],
   'info':    [ 'LOG_INFO', 'normal' ],
-  'debug':   [ 'LOG_DEBUG', 'verbose' ]
+  'debug':   [ 'LOG_DEBUG', 'verbose' ],
 };
 
 const browserLaunchers = {
@@ -37,17 +37,17 @@ const browserLaunchers = {
   'IE':        'karma-ie-launcher',
   'Opera':     'karma-opera-launcher',
   'PhantomJS': 'karma-phantomjs-launcher',
-  'Safari':    'karma-safari-launcher'
+  'Safari':    'karma-safari-launcher',
 };
 
 const merge = (arr1 = [], arr2 = []) => common.merge(arr1, arr2);
 
-const exclude = (files, filterArr) =>
-  filterArr.map(path => path.replace('.', '\\.')
+const exclude = (files, filterArr) => filterArr.map(
+  path => path.replace('.', '\\.')
     .replace('*', '.+')
     .replace('?', '.'))
-    .map(path => new RegExp(path))
-    .reduce((files, regexp) => files.filter(file => !regexp.test(file)), files);
+  .map(path => new RegExp(path))
+  .reduce((files, regexp) => files.filter(file => !regexp.test(file)), files);
 
 const parseFile = file => {
   const data = fs.readFileSync(path.resolve(file), 'utf8');
@@ -73,6 +73,7 @@ const loadFiles = files => {
       } else {
         console.error('File does not exist:', file);
         process.exit(1);
+        return '';
       }
     })
     .forEach(file => {
@@ -133,20 +134,20 @@ const getReporter = () => {
   return reporter;
 };
 
-const getBrowserConfig = (conf) => {
+const getBrowserConfig = conf => {
   const config = {
     preprocessors: {},
     files: [],
     plugins: [
       'karma-webpack',
-      { 'reporter:meta': ['type', getReporter()] }
+      { 'reporter:meta': ['type', getReporter()] },
     ],
     reporters: [ 'meta' ],
     basePath: process.env.PWD,
     port: conf.browser.port,
     autoWatch: false,
     singleRun: true,
-    concurrency: 1
+    concurrency: 1,
   };
 
   const adapter = path.resolve('./build/adapter.js');
@@ -168,8 +169,9 @@ const getEnvironment = (config, program) => {
     if (program.browser) config.environments.push('browser');
     return;
   }
-  if (!config.environments || config.environments.length === 0)
+  if (!config.environments || config.environments.length === 0) {
     config.environments = [ 'node' ];
+  }
   config.environments = Array.from(new Set(config.environments));
 
   const environments = ['node', 'browser'];
diff --git a/lib/declarative-test.js b/lib/declarative-test.js
index 249ce63a..7cbbc2f1 100644
--- a/lib/declarative-test.js
+++ b/lib/declarative-test.js
@@ -106,7 +106,7 @@ class DeclarativeTest extends Test {
           actual: sResult,
           expected: sExpected,
           message: msg,
-          stack: new Error().stack
+          stack: new Error().stack,
         });
       }
     }
diff --git a/lib/imperative-test.js b/lib/imperative-test.js
index 477452ba..73790799 100644
--- a/lib/imperative-test.js
+++ b/lib/imperative-test.js
@@ -44,7 +44,7 @@ class ImperativeTest extends Test {
   }
 
   _setupSubtestCallbacks() {
-    const subtestCallbackEnd = (test) => {
+    const subtestCallbackEnd = test => {
       if (this.subtestQueue.length > 0 && test.id === this.subtestQueue[0].id) {
         this.subtestQueue.shift();
         if (this.subtestQueue.length > 0) {
@@ -66,7 +66,7 @@ class ImperativeTest extends Test {
       }
     };
 
-    this._subtestCallback = (test) => {
+    this._subtestCallback = test => {
       this.subtests.delete(test.id);
       this.results.push({
         type: 'subtest',
@@ -132,7 +132,7 @@ class ImperativeTest extends Test {
     test.on('done', this._subtestCallback);
     test.on('error', this._subtestErrorCallback);
     if (this.beforeEachFunc) {
-      this.beforeEachFunc(test, (context) => {
+      this.beforeEachFunc(test, context => {
         Object.assign(test.context, context);
         test.run();
       });
@@ -231,7 +231,7 @@ class ImperativeTest extends Test {
   error(err, message) {
     this._check(
       'error',
-      (err) => !(err instanceof Error),
+      err => !(err instanceof Error),
       err,
       null,
       message
@@ -389,7 +389,7 @@ const test = (
   runner = runnerInstance
 ) => {
   if (!runner.options.runTodo && options.todo) {
-    return;
+    return null;
   }
   const test = new ImperativeTest(caption, func, options);
   runner.addTest(test);
diff --git a/lib/report.js b/lib/report.js
index c09827e0..15170d58 100644
--- a/lib/report.js
+++ b/lib/report.js
@@ -68,7 +68,7 @@ class ConciseReporter extends Reporter {
     if (test.metadata.filename) message += `  ${test.metadata.filename}`;
 
     let firstFailure = true;
-    test.results.forEach((res) => {
+    test.results.forEach(res => {
       if (res.type === 'subtest') {
         const t = res.test;
         if (!t.success) {
diff --git a/lib/runner.js b/lib/runner.js
index fbe4dd24..ec86a972 100644
--- a/lib/runner.js
+++ b/lib/runner.js
@@ -11,7 +11,7 @@ class Runner extends EventEmitter {
     this.reporter = new ConciseReporter();
     this.hasFailures = false;
     this.testsCount = 0;
-    this._testDoneCallback = (test) => {
+    this._testDoneCallback = test => {
       if (!test.success) this.hasFailures = true;
       if (this.reporter) this.reporter.record(test);
       if (--this.testsCount === 0) {
diff --git a/lib/speed.js b/lib/speed.js
index e0a5e398..dd67fec5 100644
--- a/lib/speed.js
+++ b/lib/speed.js
@@ -8,7 +8,7 @@ const speed = (
   count,
   tests
 ) => {
-  const times = tests.map((fn) => {
+  const times = tests.map(fn => {
     const result = [];
     const begin = process.hrtime();
     for (let i = 0; i < count; i++) result.push(fn());
@@ -19,8 +19,8 @@ const speed = (
   });
   const top = times.sort((t1, t2) => (t1.time - t2.time));
   const best = top[0].time;
-  const relative = (time) => (time * 100 / best);
-  top.forEach((test) => {
+  const relative = time => (time * 100 / best);
+  top.forEach(test => {
     test.percent = Math.round(
       Math.round(relative(test.time) * 100) / 100
     ) - 100;
diff --git a/metatests.js b/metatests.js
index 9976c918..89ec5a76 100644
--- a/metatests.js
+++ b/metatests.js
@@ -19,7 +19,7 @@ const metatests = {
   ImperativeTest,
   test,
   testSync,
-  testAsync
+  testAsync,
 };
 
 if (process.browser) {
diff --git a/package-lock.json b/package-lock.json
index 0f0b638d..29626e53 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,26 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
     "@webassemblyjs/ast": {
       "version": "1.5.13",
       "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.5.13.tgz",
@@ -201,20 +221,12 @@
       }
     },
     "acorn-jsx": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
-      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-4.1.1.tgz",
+      "integrity": "sha512-JY+iV6r+cO21KtntVvFkD+iqjtdpRUpGqKWgfkCdZq1R+kbreEl8EcdcJR4SmiIgsIQT33s6QzheQ9a275Q8xw==",
       "dev": true,
       "requires": {
-        "acorn": "^3.0.4"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
-        }
+        "acorn": "^5.0.3"
       }
     },
     "after": {
@@ -226,6 +238,7 @@
       "version": "5.5.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
       "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "optional": true,
       "requires": {
         "co": "^4.6.0",
         "fast-deep-equal": "^1.0.0",
@@ -233,12 +246,6 @@
         "json-schema-traverse": "^0.3.0"
       }
     },
-    "ajv-keywords": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
-      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
-      "dev": true
-    },
     "ansi-escapes": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
@@ -246,15 +253,9 @@
       "dev": true
     },
     "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
-    },
-    "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
       "dev": true
     },
     "anymatch": {
@@ -429,41 +430,6 @@
       "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
       "optional": true
     },
-    "babel-code-frame": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
-      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
-      "dev": true,
-      "requires": {
-        "chalk": "^1.1.3",
-        "esutils": "^2.0.2",
-        "js-tokens": "^3.0.2"
-      },
-      "dependencies": {
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^2.2.1",
-            "escape-string-regexp": "^1.0.2",
-            "has-ansi": "^2.0.0",
-            "strip-ansi": "^3.0.0",
-            "supports-color": "^2.0.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^2.0.0"
-          }
-        }
-      }
-    },
     "babel-runtime": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
@@ -770,6 +736,12 @@
       "resolved": "https://registry.npmjs.org/buffer-xor/-/buffer-xor-1.0.3.tgz",
       "integrity": "sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk="
     },
+    "builtin-modules": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
+      "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
+      "dev": true
+    },
     "builtin-status-codes": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/builtin-status-codes/-/builtin-status-codes-3.0.0.tgz",
@@ -871,9 +843,9 @@
       }
     },
     "chardet": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.4.2.tgz",
-      "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
     "chokidar": {
@@ -963,7 +935,8 @@
     "co": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
-      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ="
+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
+      "optional": true
     },
     "collection-visit": {
       "version": "1.0.0",
@@ -1083,6 +1056,12 @@
       "resolved": "https://registry.npmjs.org/constants-browserify/-/constants-browserify-1.0.0.tgz",
       "integrity": "sha1-wguW2MYXdIqvHBYCF2DNJ/y4y3U="
     },
+    "contains-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/contains-path/-/contains-path-0.1.0.tgz",
+      "integrity": "sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=",
+      "dev": true
+    },
     "content-type": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
@@ -1156,12 +1135,14 @@
       }
     },
     "cross-spawn": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
-      "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
+      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
       "dev": true,
       "requires": {
-        "lru-cache": "^4.0.1",
+        "nice-try": "^1.0.4",
+        "path-key": "^2.0.1",
+        "semver": "^5.5.0",
         "shebang-command": "^1.2.0",
         "which": "^1.2.9"
       }
@@ -1491,6 +1472,15 @@
         "prr": "~1.0.1"
       }
     },
+    "error-ex": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
+      "integrity": "sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==",
+      "dev": true,
+      "requires": {
+        "is-arrayish": "^0.2.1"
+      }
+    },
     "es5-ext": {
       "version": "0.10.46",
       "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.46.tgz",
@@ -1537,61 +1527,223 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
     "eslint": {
-      "version": "4.19.1",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-4.19.1.tgz",
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-    "supports-color": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-      "dev": true
-    },
     "table": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/table/-/table-4.0.2.tgz",
-      "integrity": "sha512-UUkEAPdSGxtRpiV9ozJ5cMTtYiqz7Ni1OGqLXRCynrvzdtR1p+cfOWe2RJLwvUG8hNanaSRjecIqwOjqeatDsA==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.1.0.tgz",
+      "integrity": "sha512-e542in22ZLhD/fOIuXs/8yDZ9W61ltF8daM88rkRNtgTIct+vI2fTnAyu/Db2TCfEcI8i7mjZz6meLq0nW7TYg==",
       "dev": true,
       "requires": {
-        "ajv": "^5.2.3",
-        "ajv-keywords": "^2.1.0",
-        "chalk": "^2.1.0",
-        "lodash": "^4.17.4",
+        "ajv": "^6.5.3",
+        "lodash": "^4.17.10",
         "slice-ansi": "1.0.0",
         "string-width": "^2.1.1"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "6.5.4",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.4.tgz",
+          "integrity": "sha512-4Wyjt8+t6YszqaXnLDfMmG/8AlO5Zbcsy3ATHncCzjW/NoPzAId8AK6749Ybjmdt+kUY1gP60fCu46oDxPv/mg==",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^2.0.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        },
+        "fast-deep-equal": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
+          "integrity": "sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=",
+          "dev": true
+        },
+        "json-schema-traverse": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+          "dev": true
+        }
       }
     },
     "tapable": {
@@ -4902,7 +5230,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
     },
@@ -5245,6 +5573,16 @@
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
     },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
     "verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
diff --git a/package.json b/package.json
index 11370322..bfea607f 100644
--- a/package.json
+++ b/package.json
@@ -49,6 +49,8 @@
     "karma-safari-launcher": "^1.0.0"
   },
   "devDependencies": {
-    "eslint": "^4.19.1"
+    "eslint": "^5.7.0",
+    "eslint-config-metarhia": "^5.0.0",
+    "eslint-plugin-import": "^2.14.0"
   }
 }
diff --git a/test/declarative.js b/test/declarative.js
index c6774142..d74481bc 100644
--- a/test/declarative.js
+++ b/test/declarative.js
@@ -17,5 +17,5 @@ metatests.case('Declarative example', namespace, {
     [1, 4],
     [2, 5],
     [3, 6],
-  ]
+  ],
 });
diff --git a/test/imperative.js b/test/imperative.js
index 2970ec13..a81ac4a9 100644
--- a/test/imperative.js
+++ b/test/imperative.js
@@ -2,39 +2,39 @@
 
 const metatests = require('..');
 
-metatests.testSync('strictSame', (test) => {
+metatests.testSync('strictSame', test => {
   test.strictSame(1, 1);
 });
 
-metatests.testSync('assert', (test) => {
+metatests.testSync('assert', test => {
   test.assert(1);
 });
 
-metatests.testSync('assertNot', (test) => {
+metatests.testSync('assertNot', test => {
   test.assertNot(0);
 });
 
-metatests.testSync('same', (test) => {
+metatests.testSync('same', test => {
   test.same(1, '1');
 });
 
-metatests.testSync('error', (test) => {
+metatests.testSync('error', test => {
   test.error({}, 'that\'s ok');
 });
 
-metatests.testSync('type', (test) => {
+metatests.testSync('type', test => {
   test.type(new Date(), 'Date');
   test.type(new Date(), 'object');
 });
 
-metatests.testAsync('sequential tests 1', (test) => {
+metatests.testAsync('sequential tests 1', test => {
   setTimeout(() => {
     test.ok(true);
     test.end();
   }, 1000);
 });
 
-metatests.testSync('sequential, must be possible to call end', (test) => {
+metatests.testSync('sequential, must be possible to call end', test => {
   test.end();
 });
 
@@ -50,29 +50,29 @@ metatests.testSync('sequential tests must be ordered and sequential', test => {
   })));
 });
 
-metatests.test('test plan', (test) => {
+metatests.test('test plan', test => {
   test.plan(2);
   test.type(new Date(), 'Date');
   test.type(new Date(), 'object');
 });
 
-metatests.test('test must be async', (test) => {
+metatests.test('test must be async', test => {
   // this will throw if test is sync as it will end it on nextTick
   setTimeout(() => test.end(), 100);
 });
 
-metatests.testSync('test sync explicit', (test) => {
+metatests.testSync('test sync explicit', test => {
   let i = 0;
   test.strictSame(++i, 1);
-  test.testSync('nested sync explicit', (test) => {
+  test.testSync('nested sync explicit', test => {
     test.strictSame(++i, 2);
   });
 });
 
-metatests.test('nested test', (t1) => {
+metatests.test('nested test', t1 => {
   t1.strictSame(123, 123);
   t1.endAfterSubtests();
-  t1.test('Delayed subtest', (t2) => {
+  t1.test('Delayed subtest', t2 => {
     process.nextTick(() => {
       t2.strictSame(123, 123);
       t2.end();
@@ -80,17 +80,17 @@ metatests.test('nested test', (t1) => {
   });
 });
 
-metatests.testAsync('nested test that ends after each subtest', (t1) => {
+metatests.testAsync('nested test that ends after each subtest', t1 => {
   let i = 0;
   t1.strictSame(++i, 1);
-  t1.testSync('sequential subtest', (t2) => {
+  t1.testSync('sequential subtest', t2 => {
     t2.strictSame(++i, 2);
   });
   setTimeout(() => {
     t1.strictSame(++i, 3);
     t1.endAfterSubtests();
   }, 2);
-  t1.testAsync('delayed subtest', (t3) => {
+  t1.testAsync('delayed subtest', t3 => {
     setTimeout(() => {
       t3.strictSame(++i, 4);
       t3.end();
@@ -98,7 +98,7 @@ metatests.testAsync('nested test that ends after each subtest', (t1) => {
   });
 });
 
-metatests.testSync('todo must not fail', (test) => {
+metatests.testSync('todo must not fail', test => {
   test.strictSame(13, 42);
 }, { todo: true });
 
@@ -108,7 +108,7 @@ metatests.testSync('must not be todo by default', test => {
   t.end();
 });
 
-metatests.testSync('test nested parallel', (test) => {
+metatests.testSync('test nested parallel', test => {
   let i = 0;
   test.strictSame(++i, 1);
   test.testSync('nested parallel 1', test => test.strictSame(++i, 2));
@@ -120,7 +120,7 @@ metatests.testSync('test nested parallel', (test) => {
   })));
 }, { parallelSubtests: true });
 
-metatests.testSync('beforeEach', (test) => {
+metatests.testSync('beforeEach', test => {
   let i = 0;
   test.beforeEach((t, callback) => {
     i = 42;
@@ -129,20 +129,20 @@ metatests.testSync('beforeEach', (test) => {
   test.testSync(t => t.strictSame(i, 42));
 });
 
-metatests.testSync('passes options context', (test) => {
+metatests.testSync('passes options context', test => {
   const context = { a: 'a', b: 'b', c: 'c' };
   test.testSync('check passed args',
     (t, args) => t.strictSame(args, context),
     { context });
 });
 
-metatests.testSync('beforeEach parameters', (test) => {
+metatests.testSync('beforeEach parameters', test => {
   const context = { a: 'a', b: 'b', c: 'c' };
   test.beforeEach((t, callback) => callback(context));
   test.testSync((t, args) => t.strictSame(args, context));
 });
 
-metatests.test('afterEach', (test) => {
+metatests.test('afterEach', test => {
   test.plan(3);
   let i = 0;
   test.afterEach((t, callback) => {
@@ -173,16 +173,16 @@ metatests.testSync('test must not fail if no assertion failed', test => {
   test.end();
 });
 
-metatests.testSync('throw with empty error', (test) => {
+metatests.testSync('throw with empty error', test => {
   test.throws(() => { throw new Error(); });
 });
 
-metatests.testSync('throw with message error', (test) => {
+metatests.testSync('throw with message error', test => {
   const message = 'message';
   test.throws(() => { throw new Error(message); }, new Error(message));
 });
 
-metatests.testSync('throw with type error (compare to Error)', (test) => {
+metatests.testSync('throw with type error (compare to Error)', test => {
   const message = 'message';
   test.throws(() => { throw new TypeError(message); }, new Error(message));
 });
@@ -203,29 +203,29 @@ metatests.testSync('doesNotThrow success', test => {
   test.assert(t.success);
 });
 
-metatests.testSync('isError no error provided', (test) => {
+metatests.testSync('isError no error provided', test => {
   const actual = new Error();
   test.isError(actual);
 });
 
-metatests.testSync('isError with error provided', (test) => {
+metatests.testSync('isError with error provided', test => {
   const actual = new TypeError();
   test.isError(actual, new TypeError());
 });
 
-metatests.testSync('testSync must return a test', (test) => {
+metatests.testSync('testSync must return a test', test => {
   const t = metatests.testSync();
   test.ok(t);
   t.end();
 });
 
-metatests.testSync('testAsync must return a test', (test) => {
+metatests.testSync('testAsync must return a test', test => {
   const t = metatests.testAsync();
   test.ok(t);
   t.end();
 });
 
-metatests.test('must catch unhandledExeptions', (test) => {
+metatests.test('must catch unhandledExeptions', test => {
   const error = new Error('Error');
   const t = new metatests.ImperativeTest('Throwing test', () => {
     throw error;
diff --git a/test/no-reporter-test.js b/test/no-reporter-test.js
index 64ac8cde..195cc3e9 100644
--- a/test/no-reporter-test.js
+++ b/test/no-reporter-test.js
@@ -23,7 +23,7 @@ if (process.argv[2] === 'child-success') {
   test.plan(2);
   ['child-success', 'child-failure'].forEach(name => {
     const child = spawn(process.execPath, [__filename, name], {
-      stdio: 'inherit'
+      stdio: 'inherit',
     });
     child.on('exit', code => {
       test.strictSame(code, 0, `must not fail for ${name}`);