feat: Docusaurus ESLint plugin to enforce best Docusaurus practices (#7206)

* feat: add eslint plugin

* refactor

* add tests

* fixups!

* fix(no-dynamic-i18n-messages): make translate() recognize template literals

* refactor: rename rule no-dynamic-i18n-messages --> string-literal-i18n-messages

* feat: add ignoreStrings option and refactor

* docs: migrate docs to /docs/api/plugins

* docs: fix anchor links in README.md

* fix: add some ignored strings

* docs: update eslint-plugin docs

* fix: update README link

* docs: various updates

- Reorder sidebar entries
- Fix title size
- Use Markdown file paths
- Simplify relative links

* address reviews

* wording polish

* add npmignore

* fix all internal warnings

* doc improvements

* fix test

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

.eslintrc.js

@@ -32,6 +32,7 @@ module.exports = {
     'plugin:@typescript-eslint/recommended',
     'plugin:regexp/recommended',
     'prettier',
+    'plugin:@docusaurus/all',
   ],
   settings: {
     'import/resolver': {
@@ -41,7 +42,14 @@ module.exports = {
     },
   },
   reportUnusedDisableDirectives: true,
-  plugins: ['react-hooks', 'header', 'jest', '@typescript-eslint', 'regexp'],
+  plugins: [
+    'react-hooks',
+    'header',
+    'jest',
+    '@typescript-eslint',
+    'regexp',
+    '@docusaurus',
+  ],
   rules: {
     'array-callback-return': WARNING,
     camelcase: WARNING,
@@ -305,6 +313,24 @@ module.exports = {
     // locals must be justified with a disable comment.
     '@typescript-eslint/no-unused-vars': [ERROR, {ignoreRestSiblings: true}],
     '@typescript-eslint/prefer-optional-chain': ERROR,
+    '@docusaurus/no-untranslated-text': [
+      WARNING,
+      {
+        ignoreStrings: [
+          '·',
+          '-',
+          '—',
+          '×',
+          '​', // zwj: ​
+          '@',
+          'WebContainers',
+          'Twitter',
+          'GitHub',
+          'Dev.to',
+          '1.x',
+        ],
+      },
+    ],
   },
   overrides: [
     {
@@ -327,6 +353,7 @@ module.exports = {
         'header/header': OFF,
         'global-require': OFF,
         '@typescript-eslint/no-var-requires': OFF,
+        '@docusaurus/no-untranslated-text': OFF,
       },
     },
     {
@@ -350,6 +377,16 @@ module.exports = {
         '@typescript-eslint/explicit-module-boundary-types': OFF,
       },
     },
+    {
+      files: [
+        '**/__tests__/**',
+        'packages/docusaurus-plugin-debug/**',
+        'website/_dogfooding/**',
+      ],
+      rules: {
+        '@docusaurus/no-untranslated-text': OFF,
+      },
+    },
     {
       // Internal files where extraneous deps don't matter much at long as
       // they run

packages/docusaurus-theme-classic/src/theme/LastUpdated/index.tsx

@@ -82,6 +82,7 @@ export default function LastUpdated({
       </Translate>
       {process.env.NODE_ENV === 'development' && (
         <div>
+          {/* eslint-disable-next-line @docusaurus/no-untranslated-text */}
           <small> (Simulated during dev for better perf)</small>
         </div>
       )}

packages/docusaurus-theme-live-codeblock/src/theme/Playground/index.tsx

@@ -23,6 +23,7 @@ function Header({children}: {children: React.ReactNode}) {
 
 function LivePreviewLoader() {
   // Is it worth improving/translating?
+  // eslint-disable-next-line @docusaurus/no-untranslated-text
   return <div>Loading...</div>;
 }
 

packages/docusaurus/src/client/exports/__tests__/Translate.test.tsx

@@ -67,6 +67,7 @@ describe('<Translate>', () => {
   it('rejects when children is not a string', () => {
     expect(() =>
       renderer.create(
+        // eslint-disable-next-line @docusaurus/string-literal-i18n-messages
         <Translate id="foo">
           {/* @ts-expect-error: for test */}
           <span>aaa</span>

packages/docusaurus/src/client/theme-fallback/Error/index.tsx

@@ -5,6 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+// Should we translate theme-fallback?
+/* eslint-disable @docusaurus/no-untranslated-text */
+
 import React from 'react';
 import Layout from '@theme/Layout';
 import ErrorBoundary from '@docusaurus/ErrorBoundary';

packages/docusaurus/src/client/theme-fallback/Loading/index.tsx

@@ -5,6 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+// Should we translate theme-fallback?
+/* eslint-disable @docusaurus/no-untranslated-text */
+
 import React from 'react';
 import type {LoadingComponentProps} from 'react-loadable';
 

packages/docusaurus/src/client/theme-fallback/NotFound/index.tsx

@@ -5,6 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+// Should we translate theme-fallback?
+/* eslint-disable @docusaurus/no-untranslated-text */
+
 import React from 'react';
 import Layout from '@theme/Layout';
 import Head from '@docusaurus/Head';

packages/eslint-plugin/.eslintrc.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+module.exports = {
+  extends: ['../../.eslintrc.js', 'plugin:eslint-plugin/recommended'],
+};

packages/eslint-plugin/.npmignore

@@ -0,0 +1,6 @@
+copyUntypedFiles.mjs
+.tsbuildinfo
+tsconfig*
+__tests__
+
+.eslintrc.js

packages/eslint-plugin/README.md

@@ -0,0 +1,7 @@
+# `@docusaurus/eslint-plugin`
+
+ESLint plugin to enforce best Docusaurus practices.
+
+## Usage
+
+See [eslint-plugin documentation](https://docusaurus.io/docs/api/misc/@docusaurus/eslint-plugin).

packages/eslint-plugin/lib/index.js

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const requireIndex = require('requireindex');
+
+module.exports = {
+  rules: requireIndex(`${__dirname}/rules`),
+  configs: {
+    recommended: {
+      rules: {
+        '@docusaurus/string-literal-i18n-messages': 'error',
+      },
+    },
+    all: {
+      rules: {
+        '@docusaurus/string-literal-i18n-messages': 'error',
+        '@docusaurus/no-untranslated-text': 'warn',
+      },
+    },
+  },
+};

packages/eslint-plugin/lib/rules/__tests__/no-untranslated-text.test.js

@@ -0,0 +1,147 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const rule = require('../no-untranslated-text');
+const {RuleTester} = require('eslint');
+const {getCommonValidTests} = require('../../util');
+
+const errorsJSX = [{messageId: 'translateChildren', type: 'JSXElement'}];
+const errorsJSXFragment = [
+  {messageId: 'translateChildren', type: 'JSXFragment'},
+];
+
+const ruleTester = new RuleTester({
+  parserOptions: {
+    ecmaVersion: 2022,
+    ecmaFeatures: {jsx: true},
+  },
+});
+ruleTester.run('no-untranslated-text', rule, {
+  valid: [
+    ...getCommonValidTests(),
+    {
+      code: '<Component>·</Component>',
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>· </Component>',
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component> · </Component>',
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>· ·</Component>',
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>· — ×</Component>',
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>{"·"}</Component>',
+      options: [{ignoreStrings: ['·']}],
+    },
+    {
+      code: "<Component>{'·'}</Component>",
+      options: [{ignoreStrings: ['·']}],
+    },
+    {
+      code: '<Component>{`·`}</Component>',
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>Docusaurus</Component>',
+      options: [{ignoreStrings: ['Docusaurus']}],
+    },
+    {
+      code: '<Component>&#8203;</Component>',
+      options: [{ignoreStrings: ['​']}],
+    },
+    {
+      code: `<>
+              {' · '}
+            </>`,
+      options: [{ignoreStrings: ['·', "'"]}],
+    },
+  ],
+
+  invalid: [
+    {
+      code: '<Component>text</Component>',
+      errors: errorsJSX,
+    },
+    {
+      code: '<Component> text </Component>',
+      errors: errorsJSX,
+    },
+    {
+      code: '<Component>"text"</Component>',
+      errors: errorsJSX,
+    },
+    {
+      code: "<Component>'text'</Component>",
+      errors: errorsJSX,
+    },
+    {
+      code: '<Component>`text`</Component>',
+      errors: errorsJSX,
+    },
+    {
+      code: '<Component>{"text"}</Component>',
+      errors: errorsJSX,
+    },
+    {
+      code: "<Component>{'text'}</Component>",
+      errors: errorsJSX,
+    },
+    {
+      code: '<Component>{`text`}</Component>',
+      errors: errorsJSX,
+    },
+    {
+      code: '<>text</>',
+      errors: errorsJSXFragment,
+    },
+    {
+      code: '<Component>· — ×</Component>',
+      errors: errorsJSX,
+      options: [{ignoreStrings: ['·', '—']}],
+    },
+    {
+      code: '<Component>··</Component>',
+      errors: errorsJSX,
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component> ·· </Component>',
+      errors: errorsJSX,
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>"·"</Component>',
+      errors: errorsJSX,
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: "<Component>'·'</Component>",
+      errors: errorsJSX,
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>`·`</Component>',
+      errors: errorsJSX,
+      options: [{ignoreStrings: ['·', '—', '×']}],
+    },
+    {
+      code: '<Component>Docusaurus</Component>',
+      errors: errorsJSX,
+      options: [{ignoreStrings: ['Docu', 'saurus']}],
+    },
+  ],
+});

packages/eslint-plugin/lib/rules/__tests__/string-literal-i18n-messages.test.js

@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const rule = require('../string-literal-i18n-messages');
+const {RuleTester} = require('eslint');
+const {getCommonValidTests} = require('../../util');
+
+const errorsJSX = [{messageId: 'translateChildren', type: 'JSXElement'}];
+const errorsFunc = [{messageId: 'translateArg', type: 'Identifier'}];
+
+const ruleTester = new RuleTester({
+  parserOptions: {
+    ecmaVersion: 2022,
+    ecmaFeatures: {jsx: true},
+  },
+});
+ruleTester.run('string-literal-i18n-messages', rule, {
+  valid: [...getCommonValidTests()],
+
+  invalid: [
+    {
+      code: '<Translate>{text}</Translate>',
+      errors: errorsJSX,
+    },
+    {
+      code: '<Translate>Hi {text} my friend</Translate>',
+      errors: errorsJSX,
+    },
+    {
+      code: '<Translate> {text} </Translate>',
+      errors: errorsJSX,
+    },
+    {
+      code: '<Translate>`{text}`</Translate>',
+      errors: errorsJSX,
+    },
+    {
+      // eslint-disable-next-line no-template-curly-in-string
+      code: '<Translate>{`${text}`}</Translate>',
+      errors: errorsJSX,
+    },
+    {
+      code: 'translate({message: metaTitle})',
+      errors: errorsFunc,
+    },
+  ],
+});

packages/eslint-plugin/lib/rules/no-untranslated-text.js

@@ -0,0 +1,71 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const {isTextLabelChild, report} = require('../util');
+
+/**
+ * @type {import('eslint').Rule.RuleModule}
+ */
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description:
+        'enforce text labels in JSX to be wrapped by translate calls',
+      category: 'Suggestions',
+      url: 'https://docusaurus.io/docs/api/misc/@docusaurus/eslint-plugin/no-untranslated-text',
+    },
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          ignoreStrings: {
+            type: 'array',
+          },
+        },
+        additionalProperties: false,
+      },
+    ],
+    messages: {
+      translateChildren:
+        'All text labels in JSX should be wrapped by translate calls',
+    },
+  },
+
+  create(context) {
+    const stringsToIgnore = context.options[0]?.ignoreStrings ?? [];
+
+    const isParentTranslate = ({child, isParentFragment}) =>
+      !isParentFragment &&
+      child.parent.openingElement.name.name === 'Translate';
+
+    const isChildValid = ({child, isParentFragment}) => {
+      if (!isTextLabelChild({child, ignoreWhitespace: true, stringsToIgnore})) {
+        return true;
+      }
+      return isParentTranslate({child, isParentFragment});
+    };
+
+    const isNodeValid = ({node, isFragment = false} = {}) =>
+      node.children.every((child) =>
+        isChildValid({child, isParentFragment: isFragment}),
+      );
+
+    return {
+      'JSXElement[openingElement.selfClosing=false]': (node) => {
+        if (!isNodeValid({node})) {
+          report(context, node, 'translateChildren');
+        }
+      },
+      'JSXFragment[openingFragment]': (node) => {
+        if (!isNodeValid({node, isFragment: true})) {
+          report(context, node, 'translateChildren');
+        }
+      },
+    };
+  },
+};

packages/eslint-plugin/lib/rules/string-literal-i18n-messages.js

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const {
+  isTextLabelChild,
+  report,
+  isStringWithoutExpressions,
+} = require('../util');
+
+/**
+ * @type {import('eslint').Rule.RuleModule}
+ */
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'enforce translate APIs to be called on plain text labels',
+      category: 'Possible Problems',
+      url: 'https://docusaurus.io/docs/api/misc/@docusaurus/eslint-plugin/string-literal-i18n-messages',
+    },
+    schema: [],
+    messages: {
+      translateChildren:
+        '<Translate> children must be hardcoded strings. You can have in-string dynamic placeholders using the values prop.',
+      translateArg:
+        'translation message must be a hardcoded string. You can have in-string dynamic placeholders using the values argument.',
+    },
+  },
+
+  create(context) {
+    const isNodeValid = (node) =>
+      node.children.every((child) => isTextLabelChild({child}));
+
+    return {
+      "JSXElement[openingElement.name.name='Translate']": (node) => {
+        if (!isNodeValid(node)) {
+          report(context, node, 'translateChildren');
+        }
+      },
+      "CallExpression > Identifier[name='translate']": (node) => {
+        const messageProperty = node.parent.arguments[0].properties.find(
+          (property) => property.key.name === 'message',
+        );
+        if (!messageProperty) {
+          return;
+        }
+
+        if (
+          !isStringWithoutExpressions({
+            text: messageProperty.value,
+          })
+        ) {
+          report(context, node, 'translateArg');
+        }
+      },
+    };
+  },
+};

packages/eslint-plugin/lib/util.js

@@ -0,0 +1,145 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const isMadeOfIgnoredStrings = ({text, stringsToIgnore}) =>
+  text
+    .trim()
+    .split(/\s+/)
+    .every((string) => stringsToIgnore.includes(string));
+
+const isWhitespace = (text) => !text || !text.trim();
+
+const isTextValid = ({text, ignoreWhitespace, stringsToIgnore}) =>
+  !!text &&
+  !(ignoreWhitespace && isWhitespace(text)) &&
+  !isMadeOfIgnoredStrings({
+    text,
+    stringsToIgnore,
+  });
+
+const isStringWithoutExpressions = ({
+  text,
+  ignoreWhitespace = false,
+  stringsToIgnore = [],
+} = {}) => {
+  switch (text.type) {
+    case 'Literal':
+      return isTextValid({text: text.value, ignoreWhitespace, stringsToIgnore});
+    case 'TemplateLiteral':
+      return (
+        !text.expressions.length &&
+        isTextValid({
+          text: text.quasis[0].value.raw,
+          ignoreWhitespace,
+          stringsToIgnore,
+        })
+      );
+    default:
+      return false;
+  }
+};
+
+const isTextLabelChild = ({
+  child,
+  ignoreWhitespace = false,
+  stringsToIgnore = [],
+} = {}) => {
+  switch (child.type) {
+    case 'JSXText':
+      return isTextValid({
+        text: child.value,
+        ignoreWhitespace,
+        stringsToIgnore,
+      });
+    case 'JSXExpressionContainer':
+      return isStringWithoutExpressions({
+        text: child.expression,
+        ignoreWhitespace,
+        stringsToIgnore,
+      });
+    default:
+      return false;
+  }
+};
+
+const report = (context, node, messageId) => {
+  context.report({
+    node,
+    messageId,
+  });
+};
+
+const getCommonValidTests = () => [
+  {
+    code: '<Translate>text</Translate>',
+  },
+  {
+    code: '<Translate> text </Translate>',
+  },
+  {
+    code: '<Translate>"text"</Translate>',
+  },
+  {
+    code: "<Translate>'text'</Translate>",
+  },
+  {
+    code: '<Translate>`text`</Translate>',
+  },
+  {
+    code: '<Translate>{"text"}</Translate>',
+  },
+  {
+    code: "<Translate>{'text'}</Translate>",
+  },
+  {
+    code: '<Translate>{`text`}</Translate>',
+  },
+  {
+    code: '<Component>{text}</Component>',
+  },
+  {
+    code: '<Component> {text} </Component>',
+  },
+  {
+    code: 'translate({message: `My page meta title`})',
+  },
+  {
+    code: `<Translate
+              id="homepage.title"
+              description="The homepage welcome message">
+                Welcome to my website
+            </Translate>`,
+  },
+  {
+    code: `<Translate
+              values={{firstName: 'Sébastien'}}>
+                {'Welcome, {firstName}! How are you?'}
+            </Translate>`,
+  },
+  {
+    code: `<Translate>{'This'} is {\`valid\`}</Translate>`,
+  },
+  {
+    code: "translate({message: 'My page meta title'})",
+  },
+  {
+    code: "translate({message: 'The logo of site {siteName}'}, {siteName: 'Docusaurus'})",
+  },
+  {
+    code: 'translate({otherProp: metaTitle})',
+  },
+  {
+    code: 'translate({otherProp: `My page meta title`})',
+  },
+];
+
+module.exports = {
+  isTextLabelChild,
+  report,
+  getCommonValidTests,
+  isStringWithoutExpressions,
+};

packages/eslint-plugin/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "@docusaurus/eslint-plugin",
+  "version": "2.0.0-beta.18",
+  "description": "ESLint plugin to enforce best Docusaurus practices.",
+  "main": "lib/index.js",
+  "keywords": [
+    "eslint",
+    "eslintplugin",
+    "eslint-plugin"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/docusaurus.git",
+    "directory": "packages/eslint-plugin"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "requireindex": "^1.2.0"
+  },
+  "devDependencies": {
+    "eslint-plugin-eslint-plugin": "^4.1.0"
+  },
+  "peerDependencies": {
+    "eslint": ">=6"
+  },
+  "engines": {
+    "node": ">=14"
+  }
+}

project-words.txt

@@ -245,12 +245,14 @@ refactorings
 regexes
 rehype
 reponame
+requireindex
 retrocompatibility
 retrocompatible
 roadmap
 rocketvalidator
 rtcts
 rtlcss
+saurus
 scaleway
 searchbar
 sebastien

website/docs/api/misc/_category_.yml

@@ -0,0 +1,2 @@
+label: Miscellaneous
+position: 4

website/docs/api/misc/eslint-plugin/README.md

@@ -0,0 +1,74 @@
+---
+sidebar_position: 0
+id: eslint-plugin
+title: '📦 eslint-plugin'
+slug: '/api/misc/@docusaurus/eslint-plugin'
+---
+
+[ESLint](https://eslint.org/) is a tool that statically analyzes your code and reports problems or suggests best practices through editor hints and command line. Docusaurus provides an ESLint plugin to enforce best Docusaurus practices.
+
+## Installation
+
+```bash npm2yarn
+npm install --save-dev @docusaurus/eslint-plugin
+```
+
+## Usage
+
+Add `@docusaurus` to the plugins section of your `.eslintrc` configuration file:
+
+```json title=".eslintrc"
+{
+  "plugins": ["@docusaurus"]
+}
+```
+
+Then, you can extend one of the configs (e.g. the `recommended` config):
+
+```json title=".eslintrc"
+{
+  "extends": ["plugin:@docusaurus/recommended"]
+}
+```
+
+Each config contains a set of rules. For more fine-grained control, you can also configure the rules you want to use directly:
+
+```json title=".eslintrc"
+{
+  "rules": {
+    "@docusaurus/string-literal-i18n-messages": "error",
+    "@docusaurus/no-untranslated-text": "warn"
+  }
+}
+```
+
+## Supported Configs
+
+- Recommended: recommended rule set for most Docusaurus sites that should be extended from.
+- All: **all** rules enabled. This will change between minor versions, so you should not use this if you want to avoid unexpected breaking changes.
+
+## Supported Rules
+
+| Name | Description |  |
+| --- | --- | --- |
+| [`@docusaurus/no-untranslated-text`](./no-untranslated-text.md) | Enforce text labels in JSX to be wrapped by translate calls |  |
+| [`@docusaurus/string-literal-i18n-messages`](./string-literal-i18n-messages.md) | Enforce translate APIs to be called on plain text labels | ✅ |
+
+✅ = recommended
+
+## Example configuration
+
+Here's an example configuration:
+
+```js title=".eslintrc.js"
+module.exports = {
+  extends: ['plugin:@docusaurus/recommended'],
+  plugins: ['@docusaurus'],
+  rules: {
+    '@docusaurus/no-untranslated-text': [
+      'warn',
+      {ignoreStrings: ['·', '—', '×']},
+    ],
+  },
+};
+```

website/docs/api/misc/eslint-plugin/no-untranslated-text.md

@@ -0,0 +1,48 @@
+---
+slug: '/api/misc/@docusaurus/eslint-plugin/no-untranslated-text'
+---
+
+# no-untranslated-text
+
+Enforce text labels in JSX to be wrapped by translate calls.
+
+When the [i18n feature](../../../i18n/i18n-introduction.md) is used, this rule ensures that all labels appearing on the website are translatable, so no string accidentally slips through untranslated.
+
+## Rule Details {#details}
+
+Examples of **incorrect** code for this rule:
+
+```js
+// Hello World is not translated
+<Component>Hello World</Component>
+```
+
+Examples of **correct** code for this rule:
+
+```js
+// Hello World is translated
+<Component>
+  <Translate>Hello World</Translate>
+</Component>
+```
+
+## Rule Configuration {#configuration}
+
+Accepted fields:
+
+<APITable>
+
+| Option | Type | Default | Description |
+| --- | --- | --- | --- |
+| `ignoreStrings` | `string[]` | `[]` | Text labels that only contain strings in this list will not be reported. |
+
+</APITable>
+
+## When Not To Use It {#when-not-to-use}
+
+If you're not using the [i18n feature](../../../i18n/i18n-introduction.md), you can disable this rule. You can also disable this rule where the text is not supposed to be translated.
+
+## Further Reading {#further-reading}
+
+- https://docusaurus.io/docs/docusaurus-core#translate
+- https://docusaurus.io/docs/docusaurus-core#translate-imperative

website/docs/api/misc/eslint-plugin/string-literal-i18n-messages.md

@@ -0,0 +1,50 @@
+---
+slug: '/api/misc/@docusaurus/eslint-plugin/string-literal-i18n-messages'
+---
+
+# string-literal-i18n-messages
+
+Enforce translate APIs to be called on plain text labels.
+
+Docusaurus offers the [`docusaurus write-translations`](../../../cli.md#docusaurus-write-translations-sitedir) API, which statically extracts the text labels marked as translatable. Dynamic values used in `<Translate>` or `translate()` calls will fail to be extracted. This rule will ensure that all translate calls are statically extractable.
+
+## Rule Details {#details}
+
+Examples of **incorrect** code for this rule:
+
+```js
+const text = 'Some text to be translated'
+
+// Invalid <Translate> child
+<Translate>{text}</Translate>
+
+// Invalid message attribute
+translate({message: text})
+```
+
+Examples of **correct** code for this rule:
+
+```js
+// Valid <Translate> child
+<Translate>Some text to be translated</Translate>
+
+// Valid message attribute
+translate({message: 'Some text to be translated'})
+
+// Valid <Translate> child using values object as prop
+<Translate values={{firstName: 'Sébastien'}}>
+  {'Welcome, {firstName}! How are you?'}
+</Translate>
+
+// Valid message attribute using values object as second argument
+translate({message: 'The logo of site {siteName}'}, {siteName: 'Docusaurus'})
+```
+
+## When Not To Use It {#when-not-to-use}
+
+If you're not using the [i18n feature](../../../i18n/i18n-introduction.md), you can disable this rule.
+
+## Further Reading {#further-reading}
+
+- https://docusaurus.io/docs/docusaurus-core#translate
+- https://docusaurus.io/docs/docusaurus-core#translate-imperative

website/docs/docusaurus-core.md

@@ -621,7 +621,7 @@ import {interpolate} from '@docusaurus/Interpolate';
 const message = interpolate('Welcome {firstName}', {firstName: 'Sébastien'});
 ```
 
-### `translate` {#translate-1}
+### `translate` {#translate-imperative}
 
 The imperative counterpart of the [`<Translate>`](#translate) component. Also supporting [placeholders interpolation](#interpolate).
 

website/package.json

@@ -80,6 +80,7 @@
   },
   "devDependencies": {
     "@tsconfig/docusaurus": "^1.0.5",
+    "@docusaurus/eslint-plugin": "2.0.0-beta.18",
     "@types/jest": "^27.4.1",
     "cross-env": "^7.0.3",
     "rimraf": "^3.0.2"

website/src/components/ColorGenerator/index.tsx

@@ -279,6 +279,7 @@ export default function ColorGenerator(): JSX.Element {
       <p>
         <Translate
           id="colorGenerator.text"
+          // eslint-disable-next-line @docusaurus/no-untranslated-text
           values={{cssPath: <code>src/css/custom.css</code>}}>
           {'Replace the variables in {cssPath} with these new variables.'}
         </Translate>

website/src/components/UpgradeGuide/index.tsx

@@ -82,6 +82,7 @@ function VersionNotice() {
                 <Link href="/community/canary">
                   <Translate
                     id="upgradeGuide.unreleasedVersion.notice.canaryDocLink.label"
+                    // eslint-disable-next-line @docusaurus/no-untranslated-text
                     values={{canaryTag: <code>@canary</code>}}>
                     {'{canaryTag} release'}
                   </Translate>

website/src/data/tweets.tsx

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+/* eslint-disable @docusaurus/no-untranslated-text */
+
 import React from 'react';
 
 import type {Props as Tweet} from '../components/Tweet';

website/src/pages/index.tsx

@@ -90,9 +90,8 @@ function MigrationAnnouncement() {
               </Link>
             ),
           }}>
-          {`Coming from {docusaurusV1Link}? Check out our {migrationGuideLink}`}
+          {`Coming from {docusaurusV1Link}? Check out our {migrationGuideLink}.`}
         </Translate>
-        .
       </div>
     </div>
   );
@@ -241,11 +240,19 @@ export default function Home(): JSX.Element {
       <main>
         <div>
           <div className={styles.banner}>
-            Support Ukraine 🇺🇦{' '}
+            <Translate
+              id="homepage.banner"
+              values={{
+                link: (
                   <Link to="https://opensource.facebook.com/support-ukraine">
+                    <Translate id="homepage.banner.link">
                       Help Provide Humanitarian Aid to Ukraine
+                    </Translate>
                   </Link>
-            .
+                ),
+              }}>
+              {'Support Ukraine 🇺🇦 {link}.'}
+            </Translate>
           </div>
         </div>
         <HeroBanner />

website/src/pages/showcase/_components/ShowcaseFilterToggle/index.tsx

@@ -59,10 +59,11 @@ export default function ShowcaseFilterToggle(): JSX.Element {
         }}
         checked={operator}
       />
-      {/* eslint-disable-next-line jsx-a11y/label-has-associated-control */}
       <label htmlFor={id} className={clsx(styles.checkboxLabel, 'shadow--md')}>
+        {/* eslint-disable @docusaurus/no-untranslated-text */}
         <span className={styles.checkboxLabelOr}>OR</span>
         <span className={styles.checkboxLabelAnd}>AND</span>
+        {/* eslint-enable @docusaurus/no-untranslated-text */}
       </label>
     </div>
   );

website/src/pages/versions.tsx

@@ -170,9 +170,15 @@ export default function Version(): JSX.Element {
           </div>
         )}
         <div className="margin-bottom--lg">
-          <h3 id="legacy">Docusaurus v1 (Legacy)</h3>
+          <h3 id="legacy">
+            <Translate id="versionsPage.legacy.title">
+              Docusaurus v1 (Legacy)
+            </Translate>
+          </h3>
           <p>
+            <Translate id="versionsPage.legacy.description">
               Here you can find documentation for legacy version of Docusaurus.
+            </Translate>
           </p>
           <table>
             <tbody>

website/src/plugins/changelog/theme/ChangelogList/index.tsx

@@ -8,6 +8,7 @@
 import React from 'react';
 import BlogLayout from '@theme/BlogLayout';
 import BlogListPaginator from '@theme/BlogListPaginator';
+import Translate from '@docusaurus/Translate';
 import type {Props} from '@theme/BlogListPage';
 import {
   PageMetadata,
@@ -41,25 +42,10 @@ function ChangelogListContent(props: Props): JSX.Element {
       <header className="margin-bottom--lg">
         <h1 style={{fontSize: '3rem'}}>{blogTitle}</h1>
         <p>
-          Subscribe through{' '}
-          <Link href="pathname:///changelog/rss.xml" className={styles.rss}>
-            <b>RSS feeds</b>
-            <svg
-              style={{
-                fill: '#f26522',
-                position: 'relative',
-                left: 4,
-                top: 1,
-                marginRight: 8,
-              }}
-              xmlns="http://www.w3.org/2000/svg"
-              width="16"
-              height="16"
-              viewBox="0 0 24 24">
-              <path d="M6.503 20.752c0 1.794-1.456 3.248-3.251 3.248-1.796 0-3.252-1.454-3.252-3.248 0-1.794 1.456-3.248 3.252-3.248 1.795.001 3.251 1.454 3.251 3.248zm-6.503-12.572v4.811c6.05.062 10.96 4.966 11.022 11.009h4.817c-.062-8.71-7.118-15.758-15.839-15.82zm0-3.368c10.58.046 19.152 8.594 19.183 19.188h4.817c-.03-13.231-10.755-23.954-24-24v4.812z" />
-            </svg>
-          </Link>{' '}
-          or follow us on{' '}
+          <Translate
+            id="changelog.description"
+            values={{
+              twitterLink: (
                 <Link
                   href="https://twitter.com/docusaurus"
                   className={styles.twitter}>
@@ -78,8 +64,38 @@ function ChangelogListContent(props: Props): JSX.Element {
                     viewBox="0 0 512 512">
                     <path d="M459.37 151.716c.325 4.548.325 9.097.325 13.645 0 138.72-105.583 298.558-298.558 298.558-59.452 0-114.68-17.219-161.137-47.106 8.447.974 16.568 1.299 25.34 1.299 49.055 0 94.213-16.568 130.274-44.832-46.132-.975-84.792-31.188-98.112-72.772 6.498.974 12.995 1.624 19.818 1.624 9.421 0 18.843-1.3 27.614-3.573-48.081-9.747-84.143-51.98-84.143-102.985v-1.299c13.969 7.797 30.214 12.67 47.431 13.319-28.264-18.843-46.781-51.005-46.781-87.391 0-19.492 5.197-37.36 14.294-52.954 51.655 63.675 129.3 105.258 216.365 109.807-1.624-7.797-2.599-15.918-2.599-24.04 0-57.828 46.782-104.934 104.934-104.934 30.213 0 57.502 12.67 76.67 33.137 23.715-4.548 46.456-13.32 66.599-25.34-7.798 24.366-24.366 44.833-46.132 57.827 21.117-2.273 41.584-8.122 60.426-16.243-14.292 20.791-32.161 39.308-52.628 54.253z" />
                   </svg>
-          </Link>{' '}
-          to stay up-to-date with new releases!
+                </Link>
+              ),
+              rssLink: (
+                <Link
+                  href="pathname:///changelog/rss.xml"
+                  className={styles.rss}>
+                  <b>
+                    <Translate id="changelog.description.rssLink">
+                      RSS feeds
+                    </Translate>
+                  </b>
+                  <svg
+                    style={{
+                      fill: '#f26522',
+                      position: 'relative',
+                      left: 4,
+                      top: 1,
+                      marginRight: 8,
+                    }}
+                    xmlns="http://www.w3.org/2000/svg"
+                    width="16"
+                    height="16"
+                    viewBox="0 0 24 24">
+                    <path d="M6.503 20.752c0 1.794-1.456 3.248-3.251 3.248-1.796 0-3.252-1.454-3.252-3.248 0-1.794 1.456-3.248 3.252-3.248 1.795.001 3.251 1.454 3.251 3.248zm-6.503-12.572v4.811c6.05.062 10.96 4.966 11.022 11.009h4.817c-.062-8.71-7.118-15.758-15.839-15.82zm0-3.368c10.58.046 19.152 8.594 19.183 19.188h4.817c-.03-13.231-10.755-23.954-24-24v4.812z" />
+                  </svg>
+                </Link>
+              ),
+            }}>
+            {
+              'Subscribe through {rssLink} or follow us on {twitterLink} to stay up-to-date with new releases!'
+            }
+          </Translate>
         </p>
       </header>
       {items.map(({content: BlogPostContent}) => (

website/src/plugins/changelog/theme/ChangelogPage/index.tsx

@@ -6,6 +6,7 @@
  */
 
 import React from 'react';
+import Translate from '@docusaurus/Translate';
 import BlogLayout from '@theme/BlogLayout';
 import ChangelogItem from '@theme/ChangelogItem';
 import ChangelogPaginator from '@theme/ChangelogPaginator';
@@ -86,7 +87,9 @@ function ChangelogPageContent(props: Props): JSX.Element {
             />
           ) : undefined
         }>
-        <Link to={listPageLink}>← Back to index page</Link>
+        <Link to={listPageLink}>
+          <Translate id="changelog.backLink">← Back to index page</Translate>
+        </Link>
 
         <ChangelogItem
           frontMatter={frontMatter}

website/src/theme/DocSidebar/Desktop/Content/index.js

@@ -11,6 +11,7 @@ import {useLocation} from '@docusaurus/router';
 
 function SidebarAd() {
   return (
+    // eslint-disable-next-line @docusaurus/no-untranslated-text
     <div style={{border: 'solid thin red', padding: 10, textAlign: 'center'}}>
       Sidebar Ad
     </div>

yarn.lock

@@ -6861,6 +6861,14 @@ eslint-module-utils@^2.7.3:
     debug "^3.2.7"
     find-up "^2.1.0"
 
+eslint-plugin-eslint-plugin@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-eslint-plugin/-/eslint-plugin-eslint-plugin-4.1.0.tgz#40ae944d79e845dc9d4a85328eea3c5bf4ae0f7d"
+  integrity sha512-QJVw+WYXJuG2469gx5G929bz7crfxySDlK1i569FkuT6dpeHDeP7MmDrKaswCx17snG25LRFD6wmVX+AO5x7Qg==
+  dependencies:
+    eslint-utils "^3.0.0"
+    estraverse "^5.2.0"
+
 eslint-plugin-header@^3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/eslint-plugin-header/-/eslint-plugin-header-3.1.1.tgz#6ce512432d57675265fac47292b50d1eff11acd6"
@@ -13185,6 +13193,11 @@ require-from-string@^2.0.2:
   resolved "https://registry.yarnpkg.com/require-like/-/require-like-0.1.2.tgz#ad6f30c13becd797010c468afa775c0c0a6b47fa"
   integrity sha512-oyrU88skkMtDdauHDuKVrgR+zuItqr6/c//FXzvmxRGMexSDc6hNvJInGW3LL46n+8b50RykrvwSUIIQH2LQ5A==
 
+requireindex@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/requireindex/-/requireindex-1.2.0.tgz#3463cdb22ee151902635aa6c9535d4de9c2ef1ef"
+  integrity sha512-L9jEkOi3ASd9PYit2cwRfyppc9NoABujTP8/5gFcbERmo5jUoAKovIC3fsF17pkTnGsrByysqX+Kxd2OTNI1ww==
+
 requires-port@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/requires-port/-/requires-port-1.0.0.tgz#925d2601d39ac485e091cf0da5c6e694dc3dcaff"