chore(v2): add ESLint rule to check for Facebook copyright headers in JS files (#1301)

.eslintignore

@@ -7,3 +7,5 @@ jest.transform.js
 website-1.x/
 website/
 scripts
+packages/docusaurus-1.x/lib/core/metadata.js
+packages/docusaurus-1.x/lib/core/MetadataBlog.js

.eslintrc.js

@@ -21,20 +21,36 @@ module.exports = {
     allowImportExportEverywhere: true,
   },
   extends: ['airbnb', 'prettier', 'prettier/react'],
-  plugins: ['react-hooks'],
+  plugins: ['react-hooks', 'header'],
   rules: {
     'class-methods-use-this': OFF, // It's a way of allowing private variables.
-    'no-console': OFF,
     'func-names': OFF,
+    'import/no-unresolved': WARNING, // Because it couldn't resolve webpack alias.
+    'header/header': [
+      ERROR,
+      'block',
+      [
+        '*',
+        {
+          pattern:
+            ' \\* Copyright \\(c\\) \\d{4}-present\\, Facebook\\, Inc\\.',
+          template: ' * Copyright (c) 2017-present, Facebook, Inc.',
+        },
+        ' *',
+        ' * This source code is licensed under the MIT license found in the',
+        ' * LICENSE file in the root directory of this source tree.',
+        ' ',
+      ],
+    ],
     'jsx-a11y/click-events-have-key-events': OFF, // Revisit in future™
     'jsx-a11y/no-noninteractive-element-interactions': OFF, // Revisit in future™
+    'no-console': OFF,
     'react/jsx-closing-bracket-location': OFF, // Conflicts with Prettier.
     'react/jsx-filename-extension': OFF,
     'react/jsx-one-expression-per-line': OFF,
     'react/no-array-index-key': OFF, // Sometimes its ok, e.g. non-changing data.
     'react/prop-types': OFF,
     'react/destructuring-assignment': OFF, // Too many lines.
-    'import/no-unresolved': WARNING, // Because it couldn't resolve webpack alias.
     'react/prefer-stateless-function': WARNING,
     'react-hooks/rules-of-hooks': ERROR,
   },

package.json

@@ -13,30 +13,35 @@
     "test": "jest"
   },
   "devDependencies": {
-    "lerna": "^3.13.1",
-    "husky": "^1.3.1",
-    "lint-staged": "^7.2.0",
-    "prettier": "^1.13.7",
     "babel-core": "^7.0.0-bridge.0",
     "babel-eslint": "8",
     "eslint": "4.x",
     "eslint-config-airbnb": "17.1.0",
     "eslint-config-prettier": "^2.9.0",
+    "eslint-plugin-header": "^3.0.0",
     "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-jsx-a11y": "^6.0.3",
     "eslint-plugin-react": "^7.11.1",
     "eslint-plugin-react-hooks": "^0.0.0",
-    "jest": "^24.1.0",
-    "react": "^16.8.4",
-    "react-dom": "^16.8.4",
     "filepath": "^1.1.0",
     "front-matter": "^2.3.0",
-    "rimraf": "^2.6.2",
-    "glob-promise": "^3.3.0"
+    "glob-promise": "^3.3.0",
+    "husky": "^1.3.1",
+    "jest": "^24.1.0",
+    "lerna": "^3.13.1",
+    "lint-staged": "^7.2.0",
+    "prettier": "^1.13.7",
+    "react": "^16.8.4",
+    "react-dom": "^16.8.4",
+    "rimraf": "^2.6.2"
   },
   "lint-staged": {
     "linters": {
-      "*.js": ["yarn lint --fix", "yarn prettier", "git add"]
+      "*.js": [
+        "yarn lint --fix",
+        "yarn prettier",
+        "git add"
+      ]
     }
   },
   "husky": {

packages/docusaurus-1.x/.eslintignore

@@ -1,4 +0,0 @@
-static/**/*.js
-build
-node_modules
-v2

packages/docusaurus/lib/load/docs/metadata.js

@@ -1,4 +1,4 @@
-/*
+/**
  * Copyright (c) 2017-present, Facebook, Inc.
  *
  * This source code is licensed under the MIT license found in the

yarn.lock

@@ -4915,6 +4915,11 @@ eslint-module-utils@^2.3.0:
     debug "^2.6.8"
     pkg-dir "^2.0.0"
 
+eslint-plugin-header@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-header/-/eslint-plugin-header-3.0.0.tgz#0e048b5f0adfdd9754142d59d551ae6bfdaf90ad"
+  integrity sha512-OIu2ciVW8jK4Ove4JHm1I7X0C98PZuLCyCsoUhAm2HpyGS+zr34qLM6iV06unnDvssvvEh5BkOfaLRF+N7cGoQ==
+
 eslint-plugin-import@^2.14.0:
   version "2.16.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-import/-/eslint-plugin-import-2.16.0.tgz#97ac3e75d0791c4fac0e15ef388510217be7f66f"