Increase files checked by ESLint (#9705)

.eslintrc.js

@@ -0,0 +1,199 @@
+module.exports = {
+  root: true,
+
+  env: {
+    browser: true,
+    node: true,
+    es6: true,
+    jest: true,
+  },
+
+  globals: {
+    ATTACHMENT_HOST: false,
+  },
+
+  parser: 'babel-eslint',
+
+  plugins: [
+    'react',
+    'jsx-a11y',
+    'import',
+    'promise',
+  ],
+
+  parserOptions: {
+    sourceType: 'module',
+    ecmaFeatures: {
+      experimentalObjectRestSpread: true,
+      jsx: true,
+    },
+    ecmaVersion: 2018,
+  },
+
+  settings: {
+    react: {
+      version: 'detect',
+    },
+    'import/extensions': [
+      '.js',
+    ],
+    'import/ignore': [
+      'node_modules',
+      '\\.(css|scss|json)$',
+    ],
+  },
+
+  rules: {
+    'brace-style': 'warn',
+    'comma-dangle': ['error', 'always-multiline'],
+    'comma-spacing': [
+      'warn',
+      {
+        before: false,
+        after: true,
+      },
+    ],
+    'comma-style': ['warn', 'last'],
+    'consistent-return': 'error',
+    'dot-notation': 'error',
+    eqeqeq: 'error',
+    indent: ['warn', 2],
+    'jsx-quotes': ['error', 'prefer-single'],
+    'no-catch-shadow': 'error',
+    'no-cond-assign': 'error',
+    'no-console': [
+      'warn',
+      {
+        allow: [
+          'error',
+          'warn',
+        ],
+      },
+    ],
+    'no-fallthrough': 'error',
+    'no-irregular-whitespace': 'error',
+    'no-mixed-spaces-and-tabs': 'warn',
+    'no-nested-ternary': 'warn',
+    'no-trailing-spaces': 'warn',
+    'no-undef': 'error',
+    'no-unreachable': 'error',
+    'no-unused-expressions': 'error',
+    'no-unused-vars': [
+      'error',
+      {
+        vars: 'all',
+        args: 'after-used',
+        ignoreRestSiblings: true,
+      },
+    ],
+    'object-curly-spacing': ['error', 'always'],
+    'padded-blocks': [
+      'error',
+      {
+        classes: 'always',
+      },
+    ],
+    quotes: ['error', 'single'],
+    semi: 'error',
+    strict: 'off',
+    'valid-typeof': 'error',
+
+    'react/jsx-boolean-value': 'error',
+    'react/jsx-closing-bracket-location': ['error', 'line-aligned'],
+    'react/jsx-curly-spacing': 'error',
+    'react/jsx-equals-spacing': 'error',
+    'react/jsx-first-prop-new-line': ['error', 'multiline-multiprop'],
+    'react/jsx-indent': ['error', 2],
+    'react/jsx-no-bind': 'error',
+    'react/jsx-no-duplicate-props': 'error',
+    'react/jsx-no-undef': 'error',
+    'react/jsx-tag-spacing': 'error',
+    'react/jsx-uses-react': 'error',
+    'react/jsx-uses-vars': 'error',
+    'react/jsx-wrap-multilines': 'error',
+    'react/no-multi-comp': 'off',
+    'react/no-string-refs': 'error',
+    'react/prop-types': 'error',
+    'react/self-closing-comp': 'error',
+
+    'jsx-a11y/accessible-emoji': 'warn',
+    'jsx-a11y/alt-text': 'warn',
+    'jsx-a11y/anchor-has-content': 'warn',
+    'jsx-a11y/anchor-is-valid': [
+      'warn',
+      {
+        components: [
+          'Link',
+          'NavLink',
+        ],
+        specialLink: [
+          'to',
+        ],
+        aspect: [
+          'noHref',
+          'invalidHref',
+          'preferButton',
+        ],
+      },
+    ],
+    'jsx-a11y/aria-activedescendant-has-tabindex': 'warn',
+    'jsx-a11y/aria-props': 'warn',
+    'jsx-a11y/aria-proptypes': 'warn',
+    'jsx-a11y/aria-role': 'warn',
+    'jsx-a11y/aria-unsupported-elements': 'warn',
+    'jsx-a11y/heading-has-content': 'warn',
+    'jsx-a11y/html-has-lang': 'warn',
+    'jsx-a11y/iframe-has-title': 'warn',
+    'jsx-a11y/img-redundant-alt': 'warn',
+    'jsx-a11y/interactive-supports-focus': 'warn',
+    'jsx-a11y/label-has-for': 'off',
+    'jsx-a11y/mouse-events-have-key-events': 'warn',
+    'jsx-a11y/no-access-key': 'warn',
+    'jsx-a11y/no-distracting-elements': 'warn',
+    'jsx-a11y/no-noninteractive-element-interactions': [
+      'warn',
+      {
+        handlers: [
+          'onClick',
+        ],
+      },
+    ],
+    'jsx-a11y/no-onchange': 'warn',
+    'jsx-a11y/no-redundant-roles': 'warn',
+    'jsx-a11y/no-static-element-interactions': [
+      'warn',
+      {
+        handlers: [
+          'onClick',
+        ],
+      },
+    ],
+    'jsx-a11y/role-has-required-aria-props': 'warn',
+    'jsx-a11y/role-supports-aria-props': 'off',
+    'jsx-a11y/scope': 'warn',
+    'jsx-a11y/tabindex-no-positive': 'warn',
+
+    'import/extensions': [
+      'error',
+      'always',
+      {
+        js: 'never',
+      },
+    ],
+    'import/newline-after-import': 'error',
+    'import/no-extraneous-dependencies': [
+      'error',
+      {
+        devDependencies: [
+          'config/webpack/**',
+          'app/javascript/mastodon/test_setup.js',
+          'app/javascript/**/__tests__/**',
+        ],
+      },
+    ],
+    'import/no-unresolved': 'error',
+    'import/no-webpack-loader-syntax': 'error',
+
+    'promise/catch-or-return': 'error',
+  },
+};