nodejs · aduh95 · Nov 7, 2020
diff --git a/lib/internal/modules/cjs/helpers.js b/lib/internal/modules/cjs/helpers.js
@@ -1,11 +1,16 @@
 'use strict';
 
 const {
+  ArrayPrototypeForEach,
   ArrayPrototypeJoin,
   ObjectDefineProperty,
   ObjectPrototypeHasOwnProperty,
   SafeMap,
   SafeSet,
+  StringPrototypeCharCodeAt,
+  StringPrototypeIncludes,
+  StringPrototypeSlice,
+  StringPrototypeStartsWith,
 } = primordials;
 const {
   ERR_MANIFEST_DEPENDENCY_MISSING,
@@ -15,8 +20,7 @@ const { NativeModule } = require('internal/bootstrap/loaders');
 
 const { validateString } = require('internal/validators');
 const path = require('path');
-const { pathToFileURL, fileURLToPath } = require('internal/url');
-const { URL } = require('url');
+const { pathToFileURL, fileURLToPath, URL } = require('internal/url');
 
 const { getOptionValue } = require('internal/options');
 const userConditions = getOptionValue('--conditions');
@@ -119,20 +123,20 @@ function makeRequireFunction(mod, redirects) {
  * translates it to FEFF, the UTF-16 BOM.
  */
 function stripBOM(content) {
-  if (content.charCodeAt(0) === 0xFEFF) {
-    content = content.slice(1);
+  if (StringPrototypeCharCodeAt(content) === 0xFEFF) {
+    content = StringPrototypeSlice(content, 1);
   }
   return content;
 }
 
 function addBuiltinLibsToObject(object) {
   // Make built-in modules available directly (loaded lazily).
   const { builtinModules } = require('internal/modules/cjs/loader').Module;
-  builtinModules.forEach((name) => {
+  ArrayPrototypeForEach(builtinModules, (name) => {
     // Neither add underscored modules, nor ones that contain slashes (e.g.,
     // 'fs/promises') or ones that are already defined.
-    if (name.startsWith('_') ||
-        name.includes('/') ||
+    if (StringPrototypeStartsWith(name, '_') ||
+        StringPrototypeIncludes(name, '/') ||
         ObjectPrototypeHasOwnProperty(object, name)) {
       return;
     }

diff --git a/lib/internal/modules/cjs/loader.js b/lib/internal/modules/cjs/loader.js
@@ -23,10 +23,17 @@
 
 const {
   ArrayIsArray,
+  ArrayPrototypeConcat,
+  ArrayPrototypeFilter,
+  ArrayPrototypeIncludes,
+  ArrayPrototypeIndexOf,
   ArrayPrototypeJoin,
+  ArrayPrototypePush,
+  ArrayPrototypeSlice,
+  ArrayPrototypeSplice,
+  Boolean,
   Error,
   JSONParse,
-  Map,
   ObjectCreate,
   ObjectDefineProperty,
   ObjectFreeze,
@@ -36,16 +43,20 @@ const {
   ObjectPrototype,
   ObjectPrototypeHasOwnProperty,
   ObjectSetPrototypeOf,
+  ReflectApply,
   ReflectSet,
   RegExpPrototypeTest,
   SafeMap,
   SafeWeakMap,
   String,
+  StringPrototypeCharAt,
+  StringPrototypeCharCodeAt,
   StringPrototypeEndsWith,
   StringPrototypeLastIndexOf,
   StringPrototypeIndexOf,
   StringPrototypeMatch,
   StringPrototypeSlice,
+  StringPrototypeSplit,
   StringPrototypeStartsWith,
 } = primordials;
 
@@ -142,8 +153,8 @@ function stat(filename) {
 
 function updateChildren(parent, child, scan) {
   const children = parent && parent.children;
-  if (children && !(scan && children.includes(child)))
-    children.push(child);
+  if (children && !(scan && ArrayPrototypeIncludes(children, child)))
+    ArrayPrototypePush(children, child);
 }
 
 const moduleParentCache = new SafeWeakMap();
@@ -161,7 +172,7 @@ function Module(id = '', parent) {
 const builtinModules = [];
 for (const [id, mod] of NativeModule.map) {
   if (mod.canBeRequiredByUsers) {
-    builtinModules.push(id);
+    ArrayPrototypePush(builtinModules, id);
   }
 }
 
@@ -349,7 +360,7 @@ function tryPackage(requestPath, exts, isMain, originalPath) {
 // In order to minimize unnecessary lstat() calls,
 // this cache is a list of known-real paths.
 // Set to an empty Map to reset.
-const realpathCache = new Map();
+const realpathCache = new SafeMap();
 
 // Check if the file exists and is not a directory
 // if using --preserve-symlinks and isMain is false,
@@ -389,10 +400,10 @@ function findLongestRegisteredExtension(filename) {
   let currentExtension;
   let index;
   let startIndex = 0;
-  while ((index = name.indexOf('.', startIndex)) !== -1) {
+  while ((index = StringPrototypeIndexOf(name, '.', startIndex)) !== -1) {
     startIndex = index + 1;
     if (index === 0) continue; // Skip dotfiles like .gitignore
-    currentExtension = name.slice(index);
+    currentExtension = StringPrototypeSlice(name, index);
     if (Module._extensions[currentExtension]) return currentExtension;
   }
   return '.js';
@@ -473,15 +484,15 @@ Module._findPath = function(request, paths, isMain) {
     return false;
   }
 
-  const cacheKey = request + '\x00' +
-                (paths.length === 1 ? paths[0] : paths.join('\x00'));
+  const cacheKey = request + '\x00' + ArrayPrototypeJoin(paths, '\x00');
   const entry = Module._pathCache[cacheKey];
   if (entry)
     return entry;
 
   let exts;
   let trailingSlash = request.length > 0 &&
-    request.charCodeAt(request.length - 1) === CHAR_FORWARD_SLASH;
+    StringPrototypeCharCodeAt(request, request.length - 1) ===
+    CHAR_FORWARD_SLASH;
   if (!trailingSlash) {
     trailingSlash = RegExpPrototypeTest(trailingSlashRegex, request);
   }
@@ -564,13 +575,14 @@ if (isWindows) {
 
     // return root node_modules when path is 'D:\\'.
     // path.resolve will make sure from.length >=3 in Windows.
-    if (from.charCodeAt(from.length - 1) === CHAR_BACKWARD_SLASH &&
-        from.charCodeAt(from.length - 2) === CHAR_COLON)
+    if (StringPrototypeCharCodeAt(from, from.length - 1) ===
+          CHAR_BACKWARD_SLASH &&
+        StringPrototypeCharCodeAt(from, from.length - 2) === CHAR_COLON)
       return [from + 'node_modules'];
 
     const paths = [];
     for (let i = from.length - 1, p = 0, last = from.length; i >= 0; --i) {
-      const code = from.charCodeAt(i);
+      const code = StringPrototypeCharCodeAt(from, i);
       // The path segment separator check ('\' and '/') was used to get
       // node_modules path for every path segment.
       // Use colon as an extra condition since we can get node_modules
@@ -580,7 +592,10 @@ if (isWindows) {
           code === CHAR_FORWARD_SLASH ||
           code === CHAR_COLON) {
         if (p !== nmLen)
-          paths.push(from.slice(0, last) + '\\node_modules');
+          ArrayPrototypePush(
+            paths,
+            StringPrototypeSlice(from, 0, last) + '\\node_modules'
+          );
         last = i;
         p = 0;
       } else if (p !== -1) {
@@ -609,10 +624,13 @@ if (isWindows) {
     // that works on both Windows and Posix is non-trivial.
     const paths = [];
     for (let i = from.length - 1, p = 0, last = from.length; i >= 0; --i) {
-      const code = from.charCodeAt(i);
+      const code = StringPrototypeCharCodeAt(from, i);
       if (code === CHAR_FORWARD_SLASH) {
         if (p !== nmLen)
-          paths.push(from.slice(0, last) + '/node_modules');
+          ArrayPrototypePush(
+            paths,
+            StringPrototypeSlice(from, 0, last) + '/node_modules'
+          );
         last = i;
         p = 0;
       } else if (p !== -1) {
@@ -625,7 +643,7 @@ if (isWindows) {
     }
 
     // Append /node_modules to handle root paths.
-    paths.push('/node_modules');
+    ArrayPrototypePush(paths, '/node_modules');
 
     return paths;
   };
@@ -638,15 +656,15 @@ Module._resolveLookupPaths = function(request, parent) {
   }
 
   // Check for node modules paths.
-  if (request.charAt(0) !== '.' ||
+  if (StringPrototypeCharAt(request, 0) !== '.' ||
       (request.length > 1 &&
-      request.charAt(1) !== '.' &&
-      request.charAt(1) !== '/' &&
-      (!isWindows || request.charAt(1) !== '\\'))) {
+      StringPrototypeCharAt(request, 1) !== '.' &&
+      StringPrototypeCharAt(request, 1) !== '/' &&
+      (!isWindows || StringPrototypeCharAt(request, 1) !== '\\'))) {
 
     let paths = modulePaths;
     if (parent != null && parent.paths && parent.paths.length) {
-      paths = parent.paths.concat(paths);
+      paths = ArrayPrototypeConcat(parent.paths, paths);
     }
 
     debug('looking for %j in %j', request, paths);
@@ -796,9 +814,9 @@ Module._load = function(request, parent, isMain) {
         delete relativeResolveCache[relResolveCacheIdentifier];
         const children = parent && parent.children;
         if (ArrayIsArray(children)) {
-          const index = children.indexOf(module);
+          const index = ArrayPrototypeIndexOf(children, module);
           if (index !== -1) {
-            children.splice(index, 1);
+            ArrayPrototypeSplice(children, index, 1);
           }
         }
       }
@@ -822,10 +840,10 @@ Module._resolveFilename = function(request, parent, isMain, options) {
 
   if (typeof options === 'object' && options !== null) {
     if (ArrayIsArray(options.paths)) {
-      const isRelative = request.startsWith('./') ||
-          request.startsWith('../') ||
-          ((isWindows && request.startsWith('.\\')) ||
-          request.startsWith('..\\'));
+      const isRelative = StringPrototypeStartsWith(request, './') ||
+          StringPrototypeStartsWith(request, '../') ||
+          ((isWindows && StringPrototypeStartsWith(request, '.\\')) ||
+          StringPrototypeStartsWith(request, '..\\'));
 
       if (isRelative) {
         paths = options.paths;
@@ -840,8 +858,8 @@ Module._resolveFilename = function(request, parent, isMain, options) {
           const lookupPaths = Module._resolveLookupPaths(request, fakeParent);
 
           for (let j = 0; j < lookupPaths.length; j++) {
-            if (!paths.includes(lookupPaths[j]))
-              paths.push(lookupPaths[j]);
+            if (!ArrayPrototypeIncludes(paths, lookupPaths[j]))
+              ArrayPrototypePush(paths, lookupPaths[j]);
           }
         }
       }
@@ -890,11 +908,12 @@ Module._resolveFilename = function(request, parent, isMain, options) {
   for (let cursor = parent;
     cursor;
     cursor = moduleParentCache.get(cursor)) {
-    requireStack.push(cursor.filename || cursor.id);
+    ArrayPrototypePush(requireStack, cursor.filename || cursor.id);
   }
   let message = `Cannot find module '${request}'`;
   if (requireStack.length > 0) {
-    message = message + '\nRequire stack:\n- ' + requireStack.join('\n- ');
+    message = message + '\nRequire stack:\n- ' +
+              ArrayPrototypeJoin(requireStack, '\n- ');
   }
   // eslint-disable-next-line no-restricted-syntax
   const err = new Error(message);
@@ -905,7 +924,7 @@ Module._resolveFilename = function(request, parent, isMain, options) {
 
 function finalizeEsmResolution(match, request, parentPath, pkgPath) {
   const { resolved, exact } = match;
-  if (StringPrototypeMatch(resolved, encodedSepRegEx))
+  if (RegExpPrototypeTest(encodedSepRegEx, resolved))
     throw new ERR_INVALID_MODULE_SPECIFIER(
       resolved, 'must not include encoded "/" or "\\" characters', parentPath);
   const filename = fileURLToPath(resolved);
@@ -942,9 +961,9 @@ Module.prototype.load = function(filename) {
 
   const extension = findLongestRegisteredExtension(filename);
   // allow .mjs to be overridden
-  if (filename.endsWith('.mjs') && !Module._extensions['.mjs']) {
+  if (StringPrototypeEndsWith(filename, '.mjs') && !Module._extensions['.mjs'])
     throw new ERR_REQUIRE_ESM(filename);
-  }
+
   Module._extensions[extension](this, filename);
   this.loaded = true;
 
@@ -1075,13 +1094,13 @@ Module.prototype._compile = function(content, filename) {
   const exports = this.exports;
   const thisValue = exports;
   const module = this;
-  if (requireDepth === 0) statCache = new Map();
+  if (requireDepth === 0) statCache = new SafeMap();
   if (inspectorWrapper) {
     result = inspectorWrapper(compiledWrapper, thisValue, exports,
                               require, module, filename, dirname);
   } else {
-    result = compiledWrapper.call(thisValue, exports, require, module,
-                                  filename, dirname);
+    result = ReflectApply(compiledWrapper, thisValue,
+                          [exports, require, module, filename, dirname]);
   }
   hasLoadedAnyUserCJSModule = true;
   if (requireDepth === 0) statCache = null;
@@ -1090,7 +1109,7 @@ Module.prototype._compile = function(content, filename) {
 
 // Native extension for .js
 Module._extensions['.js'] = function(module, filename) {
-  if (filename.endsWith('.js')) {
+  if (StringPrototypeEndsWith(filename, '.js')) {
     const pkg = readPackageScope(filename);
     // Function require shouldn't be used in ES modules.
     if (pkg && pkg.data && pkg.data.type === 'module') {
@@ -1145,7 +1164,8 @@ Module._extensions['.node'] = function(module, filename) {
 function createRequireFromPath(filename) {
   // Allow a directory to be passed as the filename
   const trailingSlash =
-    filename.endsWith('/') || (isWindows && filename.endsWith('\\'));
+    StringPrototypeEndsWith(filename, '/') ||
+    (isWindows && StringPrototypeEndsWith(filename, '\\'));
 
   const proxyPath = trailingSlash ?
     path.join(filename, 'noop.js') :
@@ -1207,15 +1227,16 @@ Module._initPaths = function() {
   }
 
   if (nodePath) {
-    paths = nodePath.split(path.delimiter).filter(function pathsFilterCB(path) {
-      return !!path;
-    }).concat(paths);
+    paths = ArrayPrototypeConcat(ArrayPrototypeFilter(
+      StringPrototypeSplit(nodePath, path.delimiter),
+      Boolean
+    ), paths);
   }
 
   modulePaths = paths;
 
   // Clone as a shallow copy, for introspection.
-  Module.globalPaths = modulePaths.slice(0);
+  Module.globalPaths = ArrayPrototypeSlice(modulePaths);
 };
 
 Module._preloadModules = function(requests) {

diff --git a/lib/internal/modules/run_main.js b/lib/internal/modules/run_main.js
@@ -1,5 +1,9 @@
 'use strict';
 
+const {
+  PromisePrototypeFinally,
+  StringPrototypeEndsWith,
+} = primordials;
 const CJSLoader = require('internal/modules/cjs/loader');
 const { Module, toRealPath, readPackageScope } = CJSLoader;
 const { getOptionValue } = require('internal/options');
@@ -29,9 +33,9 @@ function shouldUseESMLoader(mainPath) {
   if (esModuleSpecifierResolution === 'node')
     return true;
   // Determine the module format of the main
-  if (mainPath && mainPath.endsWith('.mjs'))
+  if (mainPath && StringPrototypeEndsWith(mainPath, '.mjs'))
     return true;
-  if (!mainPath || mainPath.endsWith('.cjs'))
+  if (!mainPath || StringPrototypeEndsWith(mainPath, '.cjs'))
     return false;
   const pkg = readPackageScope(mainPath);
   return pkg && pkg.data.type === 'module';
@@ -56,7 +60,7 @@ function handleMainPromise(promise) {
       process.exitCode = 13;
   }
   process.on('exit', handler);
-  return promise.finally(() => process.off('exit', handler));
+  return PromisePrototypeFinally(promise, () => process.off('exit', handler));
 }
 
 // For backwards compatibility, we have to run a bunch of