lib: remove env: node in eslint config for lib files

This patch removes the redundant `require-globals` custom
eslint rule by removing `env: node` in the eslint config
and whitelist the globals that can be accessed in native
modules instead of black listing them. This makes sense
for our `lib/` files because here we are creating the
Node.js environment instead of running in a normal user
land Node.js environment.

PR-URL: nodejs/node#27082
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

.eslintrc.js

@@ -1,5 +1,7 @@
 'use strict';
 
+/* eslint-env node */
+
 const Module = require('module');
 const path = require('path');
 
@@ -31,7 +33,6 @@ Module._findPath = (request, paths, isMain) => {
 module.exports = {
   root: true,
   plugins: ['markdown', 'node-core'],
-  env: { node: true, es6: true },
   parser: 'babel-eslint',
   parserOptions: { sourceType: 'script' },
   overrides: [

benchmark/.eslintrc.yaml

@@ -1,5 +1,9 @@
 ## Benchmark-specific linter rules
 
+env:
+  node: true
+  es6: true
+
 rules:
   comma-dangle:
     - error

lib/.eslintrc.yaml

@@ -1,3 +1,6 @@
+env:
+  es6: true
+
 rules:
   prefer-object-spread: error
   no-buffer-constructor: error
@@ -19,10 +22,11 @@ rules:
     - selector: "CallExpression[callee.object.name='Error'][callee.property.name='captureStackTrace']"
       message: "Please use `require('internal/errors').hideStackFrames()` instead."
   # Custom rules in tools/eslint-rules
-  node-core/require-globals: error
   node-core/lowercase-name-for-primitive: error
   node-core/non-ascii-character: error
 globals:
+  Intl: false
+  # Assertions
   CHECK: false
   CHECK_EQ: false
   CHECK_GE: false
@@ -37,5 +41,21 @@ globals:
   DCHECK_LE: false
   DCHECK_LT: false
   DCHECK_NE: false
+  # Parameters passed to internal modules
+  global: false
+  require: false
+  process: false
+  exports: false
+  module: false
   internalBinding: false
   primordials: false
+  # Globals
+  # TODO(joyeecheung): if possible, get these in native modules
+  # through `require` instead of grabbing them from the global proxy.
+  clearTimeout: false
+  setTimeout: false
+  clearInterval: false
+  setInterval: false
+  setImmediate: false
+  clearImmediate: false
+  console: false

lib/buffer.js

@@ -655,9 +655,10 @@ Buffer.prototype.equals = function equals(otherBuffer) {
   return _compare(this, otherBuffer) === 0;
 };
 
+let INSPECT_MAX_BYTES = 50;
 // Override how buffers are presented by util.inspect().
 Buffer.prototype[customInspectSymbol] = function inspect(recurseTimes, ctx) {
-  const max = exports.INSPECT_MAX_BYTES;
+  const max = INSPECT_MAX_BYTES;
   const actualMax = Math.min(max, this.length);
   const remaining = this.length - max;
   let str = this.hexSlice(0, actualMax).replace(/(.{2})/g, '$1 ').trim();
@@ -1090,19 +1091,25 @@ if (internalBinding('config').hasIntl) {
   };
 }
 
-module.exports = exports = {
+module.exports = {
   Buffer,
   SlowBuffer,
   transcode,
-  INSPECT_MAX_BYTES: 50,
-
   // Legacy
   kMaxLength,
   kStringMaxLength
 };
 
-Object.defineProperty(exports, 'constants', {
-  configurable: false,
-  enumerable: true,
-  value: constants
+Object.defineProperties(module.exports, {
+  constants: {
+    configurable: false,
+    enumerable: true,
+    value: constants
+  },
+  INSPECT_MAX_BYTES: {
+    configurable: true,
+    enumerable: true,
+    get() { return INSPECT_MAX_BYTES; },
+    set(val) { INSPECT_MAX_BYTES = val; }
+  }
 });

lib/crypto.js

@@ -145,7 +145,7 @@ function createVerify(algorithm, options) {
   return new Verify(algorithm, options);
 }
 
-module.exports = exports = {
+module.exports = {
   // Methods
   createCipheriv,
   createDecipheriv,
@@ -218,7 +218,7 @@ function getFipsForced() {
   return 1;
 }
 
-Object.defineProperties(exports, {
+Object.defineProperties(module.exports, {
   createCipher: {
     enumerable: false,
     value: deprecate(createCipher,

lib/internal/bootstrap/loaders.js

@@ -124,6 +124,7 @@ const internalBindingWhitelist = new SafeSet([
 let internalBinding;
 {
   const bindingObj = Object.create(null);
+  // eslint-disable-next-line no-global-assign
   internalBinding = function internalBinding(module) {
     let mod = bindingObj[module];
     if (typeof mod !== 'object') {

lib/internal/modules/cjs/helpers.js

@@ -129,7 +129,7 @@ function normalizeReferrerURL(referrer) {
   return new URL(referrer).href;
 }
 
-module.exports = exports = {
+module.exports = {
   addBuiltinLibsToObject,
   builtinLibs,
   makeRequireFunction,

lib/util.js

@@ -113,8 +113,8 @@ function timestamp() {
 }
 
 // Log is just a thin wrapper to console.log that prepends a timestamp
-function log() {
-  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
+function log(...args) {
+  console.log('%s - %s', timestamp(), format(...args));
 }
 
 /**
@@ -218,7 +218,7 @@ function getSystemErrorName(err) {
 }
 
 // Keep the `exports =` so that various functions can still be monkeypatched
-module.exports = exports = {
+module.exports = {
   _errnoException: errnoException,
   _exceptionWithHostPort: exceptionWithHostPort,
   _extend,

test/.eslintrc.yaml

@@ -1,5 +1,9 @@
 ## Test-specific linter rules
 
+env:
+  node: true
+  es6: true
+
 rules:
   # ECMAScript 6
   # http://eslint.org/docs/rules/#ecmascript-6

tools/.eslintrc.yaml

@@ -1,3 +1,7 @@
+env:
+  node: true
+  es6: true
+
 rules:
   comma-dangle:
     - error