diff --git a/tools/doc/addon-verify.js b/tools/doc/addon-verify.js
index 2ff61c21f5c22e..c4dfdba9c4d3ad 100644
--- a/tools/doc/addon-verify.js
+++ b/tools/doc/addon-verify.js
@@ -81,7 +81,7 @@ ${files[name].replace(
           target_name: 'addon',
           sources: files.map(({ name }) => name),
           includes: ['../common.gypi'],
-        }
+        },
       ]
     })
   });
diff --git a/tools/doc/generate.js b/tools/doc/generate.js
index dd213a35a6bbc4..8e3e733e52a1a1 100644
--- a/tools/doc/generate.js
+++ b/tools/doc/generate.js
@@ -41,7 +41,7 @@ let nodeVersion = null;
 let outputDir = null;
 let apilinks = {};
 
-args.forEach(function(arg) {
+args.forEach((arg) => {
   if (!arg.startsWith('--')) {
     filename = arg;
   } else if (arg.startsWith('--node-version=')) {
diff --git a/tools/doc/html.js b/tools/doc/html.js
index 00077569d8a85d..ef15cbded87f6a 100644
--- a/tools/doc/html.js
+++ b/tools/doc/html.js
@@ -413,7 +413,7 @@ function altDocs(filename, docCreated) {
     { num: '5.x' },
     { num: '4.x' },
     { num: '0.12.x' },
-    { num: '0.10.x' }
+    { num: '0.10.x' },
   ];
 
   const getHref = (versionNum) =>
diff --git a/tools/eslint-rules/required-modules.js b/tools/eslint-rules/required-modules.js
index a7a87662ac21e6..a0511e0579d911 100644
--- a/tools/eslint-rules/required-modules.js
+++ b/tools/eslint-rules/required-modules.js
@@ -71,11 +71,9 @@ module.exports = function(context) {
     'Program:exit'(node) {
       if (foundModules.length < requiredModules.length) {
         var missingModules = requiredModules.filter(
-          function(module) {
-            return foundModules.indexOf(module) === -1;
-          }
+          (module) => foundModules.indexOf(module) === -1
         );
-        missingModules.forEach(function(moduleName) {
+        missingModules.forEach((moduleName) => {
           context.report(
             node,
             'Mandatory module "{{moduleName}}" must be loaded.',
diff --git a/tools/eslint-rules/rules-utils.js b/tools/eslint-rules/rules-utils.js
index 315e7ca0adf2ef..c64b16479920dd 100644
--- a/tools/eslint-rules/rules-utils.js
+++ b/tools/eslint-rules/rules-utils.js
@@ -69,7 +69,7 @@ module.exports.inSkipBlock = function(node) {
       node.test.operator === '!') {
     const consequent = node.consequent;
     if (consequent.body) {
-      consequent.body.some(function(expressionStatement) {
+      consequent.body.some((expressionStatement) => {
         if (hasSkip(expressionStatement.expression)) {
           return hasSkipBlock = true;
         }
diff --git a/tools/license2rtf.js b/tools/license2rtf.js
index e08cf1e5c25be6..817da81d7a6ada 100644
--- a/tools/license2rtf.js
+++ b/tools/license2rtf.js
@@ -222,20 +222,12 @@ function rtfEscape(string) {
   }
 
   return string
-    .replace(/[\\{}]/g, function(m) {
-      return `\\${m}`;
-    })
-    .replace(/\t/g, function() {
-      return '\\tab ';
-    })
+    .replace(/[\\{}]/g, (m) => `\\${m}`)
+    .replace(/\t/g, () => '\\tab ')
     // eslint-disable-next-line no-control-regex
-    .replace(/[\x00-\x1f\x7f-\xff]/g, function(m) {
-      return `\\'${toHex(m.charCodeAt(0), 2)}`;
-    })
+    .replace(/[\x00-\x1f\x7f-\xff]/g, (m) => `\\'${toHex(m.charCodeAt(0), 2)}`)
     .replace(/\ufeff/g, '')
-    .replace(/[\u0100-\uffff]/g, function(m) {
-      return `\\u${toHex(m.charCodeAt(0), 4)}?`;
-    });
+    .replace(/[\u0100-\uffff]/g, (m) => `\\u${toHex(m.charCodeAt(0), 4)}?`);
 }
 
 /*
diff --git a/tools/lint-js.js b/tools/lint-js.js
index 4a7c2f08c324c8..807c7d9d85f62b 100644
--- a/tools/lint-js.js
+++ b/tools/lint-js.js
@@ -86,9 +86,7 @@ if (cluster.isMaster) {
     outFn = function(str) {
       fs.writeSync(fd, str, 'utf8');
     };
-    process.on('exit', function() {
-      fs.closeSync(fd);
-    });
+    process.on('exit', () => { fs.closeSync(fd); });
   } else {
     outFn = function(str) {
       process.stdout.write(str);
@@ -117,20 +115,20 @@ if (cluster.isMaster) {
 
   if (showProgress) {
     // Start the progress display update timer when the first worker is ready
-    cluster.once('online', function() {
+    cluster.once('online', () => {
       startTime = process.hrtime();
       setInterval(printProgress, 1000).unref();
       printProgress();
     });
   }
 
-  cluster.on('online', function(worker) {
+  cluster.on('online', (worker) => {
     // Configure worker and give it some initial work to do
     worker.send(workerConfig);
     sendWork(worker);
   });
 
-  process.on('exit', function(code) {
+  process.on('exit', (code) => {
     if (showProgress) {
       curPath = 'Done';
       printProgress();
@@ -232,7 +230,7 @@ if (cluster.isMaster) {
   // Worker
 
   var config = {};
-  process.on('message', function(files) {
+  process.on('message', (files) => {
     if (files instanceof Array) {
       // Lint some files
       const report = cli.executeOnFiles(files);
diff --git a/tools/node-lint-md-cli-rollup/src/cli-entry.js b/tools/node-lint-md-cli-rollup/src/cli-entry.js
index 0d204b15a99954..616ac357742aee 100644
--- a/tools/node-lint-md-cli-rollup/src/cli-entry.js
+++ b/tools/node-lint-md-cli-rollup/src/cli-entry.js
@@ -14,7 +14,7 @@ const args = {
   description: cli.description,
   version: [
     proc.name + ': ' + proc.version,
-    cli.name + ': ' + cli.version
+    cli.name + ': ' + cli.version,
   ].join(', '),
   ignoreName: '.' + proc.name + 'ignore',
   extensions: extensions
@@ -23,7 +23,7 @@ const config = options(process.argv.slice(2), args);
 config.detectConfig = false;
 config.plugins = plugins;
 
-engine(config, function done(err, code) {
+engine(config, (err, code) => {
   if (err) console.error(err);
   process.exit(code);
 });