Update dev dependencies and fix linting errors (#10228)

* chore: Uppate dev dependencies

* chore: Fix lint errors

* chore: Format options.json files

* chore: Fix stupid flow errors

* Update test262 whitelist

Seems test262-stream was updated and now these tests work.

package.json

@@ -32,13 +32,13 @@
     "derequire": "^2.0.2",
     "duplicate-package-checker-webpack-plugin": "^2.1.0",
     "enhanced-resolve": "^3.0.0",
-    "eslint": "^5.16.0",
+    "eslint": "^6.0.1",
     "eslint-config-babel": "^9.0.0",
     "eslint-plugin-flowtype": "^3.8.2",
     "eslint-plugin-import": "^2.17.2",
     "eslint-plugin-prettier": "^3.1.0",
     "fancy-log": "^1.3.3",
-    "flow-bin": "^0.94.0",
+    "flow-bin": "^0.102.0",
     "graceful-fs": "^4.1.15",
     "gulp": "^4.0.2",
     "gulp-babel": "^8.0.0",
@@ -48,11 +48,11 @@
     "gulp-rename": "^1.4.0",
     "gulp-uglify": "^3.0.2",
     "gulp-watch": "^5.0.1",
-    "husky": "^2.3.0",
+    "husky": "^3.0.0",
     "jest": "^24.8.0",
     "lerna": "^3.14.2",
     "lerna-changelog": "^0.5.0",
-    "lint-staged": "^8.1.7",
+    "lint-staged": "^9.2.0",
     "lodash": "^4.17.13",
     "merge-stream": "^1.0.1",
     "output-file-sync": "^2.0.0",

packages/babel-cli/test/index.js

@@ -92,7 +92,7 @@ const assertTest = function(stdout, stderr, opts, cwd) {
       if (
         // saveInFiles always creates an empty .babelrc, so lets exclude for now
         filename !== ".babelrc" &&
-        !opts.inFiles.hasOwnProperty(filename)
+        !Object.prototype.hasOwnProperty.call(opts.inFiles, filename)
       ) {
         const expected = opts.outFiles[filename];
         const actual = actualFiles[filename];

packages/babel-core/src/config/config-chain.js

@@ -268,13 +268,11 @@ function babelrcLoadEnabled(
   });
 }
 
-const validateConfigFile = makeWeakCache(
+const validateConfigFile = makeWeakCache((file: ConfigFile): ValidatedFile => ({
-  (file: ConfigFile): ValidatedFile => ({
   filepath: file.filepath,
   dirname: file.dirname,
   options: validate("configfile", file.options),
-  }),
+}));
-);
 
 const validateBabelrcFile = makeWeakCache(
   (file: ConfigFile): ValidatedFile => ({
@@ -284,13 +282,11 @@ const validateBabelrcFile = makeWeakCache(
   }),
 );
 
-const validateExtendFile = makeWeakCache(
+const validateExtendFile = makeWeakCache((file: ConfigFile): ValidatedFile => ({
-  (file: ConfigFile): ValidatedFile => ({
   filepath: file.filepath,
   dirname: file.dirname,
   options: validate("extendsfile", file.options),
-  }),
+}));
-);
 
 /**
  * Build a config chain for just the programmatic options passed into Babel.
@@ -549,7 +545,7 @@ function normalizeOptions(opts: ValidatedOptions): ValidatedOptions {
 
   // "sourceMap" is just aliased to sourceMap, so copy it over as
   // we merge the options together.
-  if (options.hasOwnProperty("sourceMap")) {
+  if (Object.prototype.hasOwnProperty.call(options, "sourceMap")) {
     options.sourceMaps = options.sourceMap;
     delete options.sourceMap;
   }

packages/babel-core/src/config/validation/option-assertions.js

@@ -278,7 +278,7 @@ export function assertConfigFileSearch(
   ) {
     throw new Error(
       `${msg(loc)} must be a undefined, a boolean, a string, ` +
-        `got ${JSON.stringify(value)}`,
+        `got ${JSON.stringify((value: any))}`,
     );
   }
 
@@ -302,7 +302,7 @@ export function assertBabelrcSearch(
   } else if (!checkValidTest(value)) {
     throw new Error(
       `${msg(loc)} must be a undefined, a boolean, a string/Function/RegExp ` +
-        `or an array of those, got ${JSON.stringify(value)}`,
+        `or an array of those, got ${JSON.stringify((value: any))}`,
     );
   }
   return (value: any);

packages/babel-core/src/transformation/file/generate.js

@@ -1,7 +1,7 @@
 // @flow
 
 import type { PluginPasses } from "../../config";
-import convertSourceMap, { type SourceMap } from "convert-source-map";
+import convertSourceMap, { typeof SourceMap } from "convert-source-map";
 import generate from "@babel/generator";
 
 import type File from "./file";

packages/babel-core/src/transformation/file/merge-map.js

@@ -1,6 +1,6 @@
 // @flow
 
-import type { SourceMap } from "convert-source-map";
+import typeof { SourceMap } from "convert-source-map";
 import sourceMap from "source-map";
 
 export default function mergeSourceMap(

packages/babel-core/src/transformation/index.js

@@ -1,6 +1,6 @@
 // @flow
 import traverse from "@babel/traverse";
-import type { SourceMap } from "convert-source-map";
+import typeof { SourceMap } from "convert-source-map";
 
 import type { ResolvedConfig, PluginPasses } from "../config";
 

packages/babel-generator/test/fixtures/comments/create-parenthesized-expressions/options.json

@@ -1,3 +1,3 @@
 {
-  "parserOpts": {"createParenthesizedExpressions": true}
+  "parserOpts": { "createParenthesizedExpressions": true }
 }

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/options.json

@@ -1,5 +1,3 @@
 {
-  "plugins": [
+  "plugins": [["proposal-private-methods", { "loose": false }]]
-    ["proposal-private-methods", { "loose": false }]
-  ]
 }

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/options.json

@@ -1,5 +1,3 @@
 {
-  "plugins": [
+  "plugins": [["proposal-private-methods", { "loose": true }]]
-    ["proposal-private-methods", { "loose": true }]
-  ]
 }

packages/babel-helper-fixtures/src/index.js

@@ -169,9 +169,7 @@ export default function get(entryLoc): Array<Suite> {
 
         if (minimumVersion == null) {
           throw new Error(
-            `'minNodeVersion' has invalid semver format: ${
+            `'minNodeVersion' has invalid semver format: ${taskOpts.minNodeVersion}`,
-              taskOpts.minNodeVersion
-            }`,
           );
         }
 

packages/babel-node/test/index.js

@@ -77,7 +77,7 @@ const assertTest = function(stdout, stderr, opts) {
     const actualFiles = readDir(path.join(tmpLoc));
 
     Object.keys(actualFiles).forEach(function(filename) {
-      if (!opts.inFiles.hasOwnProperty(filename)) {
+      if (!Object.prototype.hasOwnProperty.call(opts.inFiles, filename)) {
         const expected = opts.outFiles[filename];
         const actual = actualFiles[filename];
 

packages/babel-parser/src/parser/expression.js

@@ -1137,9 +1137,7 @@ export default class ExpressionParser extends LValParser {
     if (node.property.name !== propertyName || containsEsc) {
       this.raise(
         node.property.start,
-        `The only valid meta property for ${meta.name} is ${
+        `The only valid meta property for ${meta.name} is ${meta.name}.${propertyName}`,
-          meta.name
-        }.${propertyName}`,
       );
     }
 

packages/babel-parser/src/plugins/typescript/index.js

@@ -369,9 +369,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         ) {
           throw this.unexpected(
             pattern.start,
-            `Name in a signature must be an Identifier, ObjectPattern or ArrayPattern, instead got ${
+            "Name in a signature must be an Identifier, ObjectPattern or ArrayPattern," +
-              pattern.type
+              `instead got ${pattern.type}`,
-            }`,
           );
         }
         return pattern;

packages/babel-parser/test/fixtures/core/scope/dupl-bind-func-module/options.json

@@ -1,4 +1,4 @@
 {
   "sourceType": "module",
-  "throws":"Identifier 'foo' has already been declared (2:9)"
+  "throws": "Identifier 'foo' has already been declared (2:9)"
 }

packages/babel-parser/test/fixtures/placeholders/export/default-default-from/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": ["placeholders"],
-    "placeholders"
-  ],
   "sourceType": "module",
   "throws": "This experimental syntax requires enabling the parser plugin: 'exportDefaultFrom' (1:7)"
 }

packages/babel-parser/test/fixtures/placeholders/export/default-named-from-2/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": ["placeholders"],
-    "placeholders"
-  ],
   "sourceType": "module",
   "throws": "This experimental syntax requires enabling the parser plugin: 'exportDefaultFrom' (1:16)"
 }

packages/babel-parser/test/fixtures/placeholders/export/default-named-from-3/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": ["placeholders"],
-    "placeholders"
-  ],
   "sourceType": "module",
   "throws": "This experimental syntax requires enabling the parser plugin: 'exportDefaultFrom' (1:16)"
 }

packages/babel-parser/test/fixtures/placeholders/export/default-named-from/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": ["placeholders"],
-    "placeholders"
-  ],
   "sourceType": "module",
   "throws": "This experimental syntax requires enabling the parser plugin: 'exportDefaultFrom' (1:7)"
 }

packages/babel-parser/test/fixtures/placeholders/export/star-from-2/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": ["placeholders"],
-    "placeholders"
-  ],
   "sourceType": "module",
   "throws": "This experimental syntax requires enabling the parser plugin: 'exportNamespaceFrom' (1:9)"
 }

packages/babel-parser/test/fixtures/placeholders/export/star-from-3/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": ["placeholders"],
-    "placeholders"
-  ],
   "sourceType": "module",
   "throws": "This experimental syntax requires enabling the parser plugin: 'exportNamespaceFrom' (1:9)"
 }

packages/babel-parser/test/fixtures/typescript/types/literal-string-2/options.json

@@ -1,7 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
+  "plugins": ["typescript"],
-    "typescript"
-  ],
   "throws": "Template literal types cannot have any substitution (1:14)"
 }

packages/babel-parser/test/fixtures/typescript/types/read-only-2/options.json

@@ -1,7 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
+  "plugins": ["typescript"],
-    "typescript"
-  ],
   "throws": "'readonly' type modifier is only permitted on array and tuple literal types. (1:11)"
 }

packages/babel-parser/test/fixtures/typescript/types/read-only-3/options.json

@@ -1,7 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
+  "plugins": ["typescript"],
-    "typescript"
-  ],
   "throws": "'readonly' type modifier is only permitted on array and tuple literal types. (1:11)"
 }

packages/babel-parser/test/fixtures/typescript/types/read-only-4/options.json

@@ -1,7 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
+  "plugins": ["typescript"],
-    "typescript"
-  ],
   "throws": "'readonly' type modifier is only permitted on array and tuple literal types. (1:11)"
 }

packages/babel-plugin-proposal-pipeline-operator/test/fixtures/fsharp/await/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": [["proposal-pipeline-operator", { "proposal": "fsharp" }]],
-    ["proposal-pipeline-operator", { "proposal": "fsharp" }]
-  ],
   "parserOpts": {
     "allowReturnOutsideFunction": true
   },

packages/babel-plugin-proposal-pipeline-operator/test/fixtures/fsharp/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": [["proposal-pipeline-operator", { "proposal": "fsharp" }]],
-    ["proposal-pipeline-operator", { "proposal": "fsharp" }]
-  ],
   "parserOpts": {
     "allowReturnOutsideFunction": true
   }

packages/babel-plugin-proposal-pipeline-operator/test/fixtures/smart/await/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": [["proposal-pipeline-operator", { "proposal": "smart" }]],
-    ["proposal-pipeline-operator", { "proposal": "smart" }]
-  ],
   "parserOpts": {
     "allowReturnOutsideFunction": true
   },

packages/babel-plugin-proposal-pipeline-operator/test/fixtures/smart/options.json

@@ -1,7 +1,5 @@
 {
-  "plugins": [
+  "plugins": [["proposal-pipeline-operator", { "proposal": "smart" }]],
-    ["proposal-pipeline-operator", { "proposal": "smart" }]
-  ],
   "parserOpts": {
     "allowReturnOutsideFunction": true
   }

packages/babel-plugin-transform-modules-commonjs/test/fixtures/class-properties/options.json

@@ -1,6 +1,10 @@
 {
   "parserOpts": {
-    "plugins": ["classProperties", "classPrivateProperties", "classPrivateMethods"]
+    "plugins": [
+      "classProperties",
+      "classPrivateProperties",
+      "classPrivateMethods"
+    ]
   },
   "plugins": ["transform-modules-commonjs"]
 }

packages/babel-plugin-transform-runtime/src/index.js

@@ -314,9 +314,7 @@ export default declare((api, options, dirname) => {
             node.callee = t.memberExpression(
               t.callExpression(
                 this.addDefaultImport(
-                  `${moduleName}/${corejsRoot}/instance/${
+                  `${moduleName}/${corejsRoot}/instance/${InstanceProperties[propertyName].path}`,
-                    InstanceProperties[propertyName].path
-                  }`,
                   `${propertyName}InstanceProperty`,
                 ),
                 [context2],
@@ -407,9 +405,7 @@ export default declare((api, options, dirname) => {
               path.replaceWith(
                 t.callExpression(
                   this.addDefaultImport(
-                    `${moduleName}/${corejsRoot}/instance/${
+                    `${moduleName}/${corejsRoot}/instance/${InstanceProperties[propertyName].path}`,
-                      InstanceProperties[propertyName].path
-                    }`,
                     `${propertyName}InstanceProperty`,
                   ),
                   [object],
@@ -421,9 +417,7 @@ export default declare((api, options, dirname) => {
 
           path.replaceWith(
             this.addDefaultImport(
-              `${modulePath}/${corejsRoot}/${
+              `${modulePath}/${corejsRoot}/${StaticProperties[objectName][propertyName].path}`,
-                StaticProperties[objectName][propertyName].path
-              }`,
               `${objectName}$${propertyName}`,
             ),
           );

packages/babel-plugin-transform-runtime/test/fixtures/runtime-corejs3/built-in-globals-proposals/options.json

@@ -1,3 +1,5 @@
 {
-  "plugins": [["transform-runtime", { "corejs": { "version": 3, "proposals": true } }]]
+  "plugins": [
+    ["transform-runtime", { "corejs": { "version": 3, "proposals": true } }]
+  ]
 }

packages/babel-plugin-transform-runtime/test/fixtures/runtime-corejs3/built-in-instance-methods-proposals/options.json

@@ -1,3 +1,5 @@
 {
-  "plugins": [["transform-runtime", { "corejs": { "version": 3, "proposals": true } }]]
+  "plugins": [
+    ["transform-runtime", { "corejs": { "version": 3, "proposals": true } }]
+  ]
 }

packages/babel-plugin-transform-runtime/test/fixtures/runtime-corejs3/built-in-static-methods-proposals/options.json

@@ -1,3 +1,5 @@
 {
-  "plugins": [["transform-runtime", { "corejs": { "version": 3, "proposals": true } }]]
+  "plugins": [
+    ["transform-runtime", { "corejs": { "version": 3, "proposals": true } }]
+  ]
 }

packages/babel-preset-env/src/polyfills/regenerator/entry-plugin.js

@@ -34,9 +34,7 @@ export default function() {
     post() {
       if (this.opts.debug && this.regeneratorImportExcluded) {
         console.log(
-          `\n[${
+          `\n[${this.file.opts.filename}] Based on your targets, regenerator-runtime import excluded.`,
-            this.file.opts.filename
-          }] Based on your targets, regenerator-runtime import excluded.`,
         );
       }
     },

packages/babel-preset-env/src/polyfills/regenerator/usage-plugin.js

@@ -22,9 +22,7 @@ export default function() {
     post() {
       if (this.opts.debug && this.usesRegenerator) {
         console.log(
-          `\n[${
+          `\n[${this.file.opts.filename}] Based on your code and targets, added regenerator-runtime.`,
-            this.file.opts.filename
-          }] Based on your code and targets, added regenerator-runtime.`,
         );
       }
     },

packages/babel-standalone/src/index.js

@@ -40,7 +40,7 @@ const isArray =
  */
 function loadBuiltin(builtinTable, name) {
   if (isArray(name) && typeof name[0] === "string") {
-    if (builtinTable.hasOwnProperty(name[0])) {
+    if (Object.prototype.hasOwnProperty.call(builtinTable, name[0])) {
       return [builtinTable[name[0]]].concat(name.slice(1));
     }
     return;
@@ -66,7 +66,7 @@ function processOptions(options) {
       if (
         isArray(preset) &&
         typeof preset[0] === "object" &&
-        preset[0].hasOwnProperty("buildPreset")
+        Object.prototype.hasOwnProperty.call(preset[0], "buildPreset")
       ) {
         preset[0] = { ...preset[0], buildPreset: preset[0].buildPreset };
       }
@@ -112,7 +112,7 @@ export const buildExternalHelpers = babelBuildExternalHelpers;
  * Registers a named plugin for use with Babel.
  */
 export function registerPlugin(name: string, plugin: Object | Function): void {
-  if (availablePlugins.hasOwnProperty(name)) {
+  if (Object.prototype.hasOwnProperty.call(availablePlugins, name)) {
     console.warn(
       `A plugin named "${name}" is already registered, it will be overridden`,
     );
@@ -135,7 +135,7 @@ export function registerPlugins(newPlugins: {
  * Registers a named preset for use with Babel.
  */
 export function registerPreset(name: string, preset: Object | Function): void {
-  if (availablePresets.hasOwnProperty(name)) {
+  if (Object.prototype.hasOwnProperty.call(availablePresets, name)) {
     console.warn(
       `A preset named "${name}" is already registered, it will be overridden`,
     );

packages/babel-template/src/options.js

@@ -149,7 +149,7 @@ export function normalizeReplacements(
       return acc;
     }, {});
   } else if (typeof replacements === "object" || replacements == null) {
-    return replacements || undefined;
+    return (replacements: any) || undefined;
   }
 
   throw new Error(

packages/babel-template/src/populate.js

@@ -45,9 +45,7 @@ export default function populatePlaceholders(
           (replacements && replacements[placeholder.name]) || null,
         );
       } catch (e) {
-        e.message = `@babel/template placeholder "${placeholder.name}": ${
+        e.message = `@babel/template placeholder "${placeholder.name}": ${e.message}`;
-          e.message
-        }`;
         throw e;
       }
     });

packages/babel-traverse/src/index.js

@@ -25,9 +25,7 @@ export default function traverse(
     if (parent.type !== "Program" && parent.type !== "File") {
       throw new Error(
         "You must pass a scope and parentPath unless traversing a Program/File. " +
-          `Instead of that you tried to traverse a ${
+          `Instead of that you tried to traverse a ${parent.type} node without ` +
-            parent.type
-          } node without ` +
           "passing scope and parentPath.",
       );
     }

packages/babel-types/scripts/generators/flow.js

@@ -103,9 +103,7 @@ for (const type in t.NODE_FIELDS) {
 }
 
 for (let i = 0; i < t.TYPES.length; i++) {
-  let decl = `declare function is${
+  let decl = `declare function is${t.TYPES[i]}(node: ?Object, opts?: ?Object): boolean`;
-    t.TYPES[i]
-  }(node: ?Object, opts?: ?Object): boolean`;
 
   if (t.NODE_FIELDS[t.TYPES[i]]) {
     decl += ` %checks (node instanceof ${NODE_PREFIX}${t.TYPES[i]})`;

packages/babel-types/scripts/generators/generateAsserts.js

@@ -18,7 +18,8 @@ import is from "../../validators/is";
 function assert(type: string, node: Object, opts?: Object): void {
   if (!is(type, node, opts)) {
     throw new Error(
-      \`Expected type "\${type}" with option \${JSON.stringify(opts)}, but instead got "\${node.type}".\`,
+      \`Expected type "\${type}" with option \${JSON.stringify((opts: any))}, \` +
+        \`but instead got "\${node.type}".\`,
     );
   }
 }\n\n`;

packages/babel-types/scripts/generators/typescript.js

@@ -104,9 +104,7 @@ for (const type in t.NODE_FIELDS) {
 }
 
 for (let i = 0; i < t.TYPES.length; i++) {
-  let decl = `export function is${
+  let decl = `export function is${t.TYPES[i]}(node: object | null | undefined, opts?: object | null): `;
-    t.TYPES[i]
-  }(node: object | null | undefined, opts?: object | null): `;
 
   if (t.NODE_FIELDS[t.TYPES[i]]) {
     decl += `node is ${t.TYPES[i]};`;

packages/babel-types/src/asserts/assertNode.js

@@ -4,6 +4,6 @@ import isNode from "../validators/isNode";
 export default function assertNode(node?: Object): void {
   if (!isNode(node)) {
     const type = (node && node.type) || JSON.stringify(node);
-    throw new TypeError(`Not a valid node of type "${type}"`);
+    throw new TypeError(`Not a valid node of type "${(type: any)}"`);
   }
 }

packages/babel-types/src/asserts/generated/index.js

@@ -9,7 +9,7 @@ function assert(type: string, node: Object, opts?: Object): void {
   if (!is(type, node, opts)) {
     throw new Error(
       `Expected type "${type}" with option ${JSON.stringify(
-        opts,
+        (opts: any),
       )}, but instead got "${node.type}".`,
     );
   }

packages/babel-types/src/builders/builder.js

@@ -8,9 +8,7 @@ export default function builder(type: string, ...args: Array<any>): Object {
   const countArgs = args.length;
   if (countArgs > keys.length) {
     throw new Error(
-      `${type}: Too many arguments passed. Received ${countArgs} but can receive no more than ${
+      `${type}: Too many arguments passed. Received ${countArgs} but can receive no more than ${keys.length}`,
-        keys.length
-      }`,
     );
   }
 

scripts/tests/test262/test262_whitelist.txt

@@ -282,23 +282,6 @@ built-ins/RegExp/property-escapes/unsupported-property-Line_Break-with-value.js(
 built-ins/RegExp/property-escapes/unsupported-property-Line_Break-with-value.js(strict mode)
 built-ins/RegExp/property-escapes/unsupported-property-Line_Break.js(default)
 built-ins/RegExp/property-escapes/unsupported-property-Line_Break.js(strict mode)
-language/comments/hashbang/escaped-bang-041.js(default)
-language/comments/hashbang/escaped-bang-u0021.js(default)
-language/comments/hashbang/escaped-bang-u21.js(default)
-language/comments/hashbang/escaped-bang-x21.js(default)
-language/comments/hashbang/escaped-hash-043.js(default)
-language/comments/hashbang/escaped-hash-u0023.js(default)
-language/comments/hashbang/escaped-hash-u23.js(default)
-language/comments/hashbang/escaped-hash-x23.js(default)
-language/comments/hashbang/escaped-hashbang.js(default)
-language/comments/hashbang/multi-line-comment.js(default)
-language/comments/hashbang/preceding-directive-prologue-sc.js(default)
-language/comments/hashbang/preceding-directive-prologue.js(default)
-language/comments/hashbang/preceding-empty-statement.js(default)
-language/comments/hashbang/preceding-hashbang.js(default)
-language/comments/hashbang/preceding-line-comment.js(default)
-language/comments/hashbang/preceding-multi-line-comment.js(default)
-language/comments/hashbang/preceding-whitespace.js(default)
 language/expressions/assignment/destructuring/obj-prop-__proto__dup.js(default)
 language/expressions/assignment/destructuring/obj-prop-__proto__dup.js(strict mode)
 language/expressions/async-arrow-function/await-as-param-ident-nested-arrow-parameter-position.js(default)