.eslintrc

{
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "sourceType": "module"
  },
  "extends": [
    "eslint:recommended"
  ],
  "plugins": [
    "angular",
    "html",
    "unused-imports",
    "@typescript-eslint",
    "oppia"
  ],
  "overrides": [
    {
      // We exclude test files from dependency injection format checks because
      // they are never minified.
      "files": ["*Spec.js", "*Spec.ts"],
      "rules": {
        "angular/di": "off"
      }
    },
    {
      // We only run the e2e action checks on end-to-end test files, and
      // we exclude files that we haven't fixed yet.
      "files": [
        "core/tests/protractor/*.js",
        "core/tests/protractor_utils/*.js",
        "core/tests/protractor_desktop/*.js"
      ],
      "excludedFiles": [
        "ClassroomPage.js",
        "DeleteAccountPage.js",
        "ExplorationEditorHistoryTab.js",
        "ExplorationEditorMainTab.js",
        "ExplorationEditorPage.js",
        "ExplorationEditorSettingsTab.js",
        "ExplorationEditorStatsTab.js",
        "ExplorationEditorTranslationTab.js",
        "GetStartedPage.js",
        "LearnerDashboardPage.js",
        "LibraryPage.js",
        "ProfilePage.js",
        "ProtractorConstants.js",
        "SkillEditorPage.js",
        "StoryEditorPage.js",
        "SubscriptionDashboardPage.js",
        "ThanksPage.js",
        "TopicAndStoryViewerPage.js",
        "TopicEditorPage.js",
        "TopicsAndSkillsDashboardPage.js",
        "action.js",
        "forms.js",
        "general.js",
        "users.js",
        "waitFor.js",
        "workflow.js",
        "additionalEditorFeatures.js",
        "additionalPlayerFeatures.js",
        "adminTabFeatures.js",
        "classroomPage.js",
        "classroomPageFileUploadFeatures.js",
        "collections.js",
        "contributorDashboard.js",
        "coreEditorAndPlayerFeatures.js",
        "creatorDashboard.js",
        "embedding.js",
        "explorationFeedbackTab.js",
        "explorationHistoryTab.js",
        "explorationImprovementsTab.js",
        "explorationStatisticsTab.js",
        "explorationTranslationTab.js",
        "extensions.js",
        "fileUploadExtensions.js",
        "learnerDashboard.js",
        "navigation.js",
        "playVoiceovers.js",
        "preferences.js",
        "profileFeatures.js",
        "publicationAndLibrary.js",
        "skillEditor.js",
        "topicAndStoryEditor.js",
        "topicAndStoryEditorFileUploadFeatures.js",
        "topicAndStoryViewer.js",
        "topicsAndSkillsDashboard.js",
        "userJourneys.js",
        "voiceoverUploadFeatures.js",
        "wipeout.js",
        "accessibility.js",
        "learnerFlow.js",
        "libraryFlow.js",
        "profileMenuFlow.js",
        "excludedForTesting.js"
      ],
      "rules": {
        "oppia/e2e-action": "error",
      }
    },
    {
      // We only run the protractor practices checks on protractor end-to-end test files.
      "files": [
        "core/tests/protractor/*.js",
        "core/tests/protractor_utils/*.js",
        "core/tests/protractor_desktop/*.js"
      ],
      "rules": {
        "oppia/protractor-practices": "error",
      }
    }
  ],
  "rules": {
    "oppia/break-after-parens": "error",
    "oppia/no-multiline-disable": "error",
    "oppia/test-message-style": "error",
    "oppia/dependency-checks": "error",
    "angular/di": [
      "error",
      "array"
    ],
    "angular/di-unused": "error",
    "angular/directive-restrict": [
      "error",
      {
        "restrict": "E"
      }
    ],
    "angular/no-inline-template": [
      "error",
      {
        "allowSimple": true
      }
    ],
    "array-bracket-spacing": [
      "error",
      "never"
    ],
    "brace-style":[
      "error",
      "1tbs"
    ],
    "camelcase": [
      "error",
      {
        "properties": "never"
      }
    ],
    "capitalized-comments": [
      "error",
      "always",
      {
        "ignorePattern": "disable-bad-pattern-check|fall-through",
        "ignoreConsecutiveComments": true
      }
    ],
    "comma-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "curly": [
      "error",
      "all"
    ],
    "dot-notation": [
      "error",
      {
        "allowKeywords": false
      }
    ],
    "eol-last":[
      "error",
      "always"
    ],
    "eqeqeq": [
      "error",
      "always"
    ],
    "func-style": [
      "error",
      "expression"
    ],
    "indent": [
      "error",
      2,
      {
        "ArrayExpression": 1,
        "flatTernaryExpressions": true,
        "FunctionExpression": {
          "body": 1,
          "parameters": 2
        },
        "MemberExpression": 1,
        "SwitchCase": 1,
        "ignoredNodes": [
          "ConditionalExpression"
        ]
      }
    ],
    "key-spacing": "error",
    "keyword-spacing": [
      "error",
      {
        "before": true,
        "after": true
      }
    ],
    "max-len": [
      "error",
      {
        "code": 80,
        "ignoreUrls": true,
        "ignorePattern": "^import \\{"
      }
    ],
    "no-compare-neg": "off",
    "no-console": [
      "error",
      {
        "allow": [
          "error",
          "warn"
        ]
      }
    ],
    "no-constant-condition": [
      "off"
    ],
    "no-empty": [
      "error",
      {
        "allowEmptyCatch": true
      }
    ],
    "no-multi-spaces": [
      "error"
    ],
    "no-multi-str": [
      "error"
    ],
    "no-prototype-builtins": "off",
    "no-redeclare": [
      "off"
    ],
    "no-restricted-globals": [
      "error", "addEventListener", "blur", "close", "closed", "confirm",
      "defaultStatus", "event", "external", "defaultstatus", "find", "focus",
      "frameElement", "frames", "history", "innerHeight", "innerWidth",
      "length", "location", "locationbar", "menubar", "moveBy", "moveTo",
      "name", "onblur", "onerror", "onfocus", "onload", "onresize", "onunload",
      "open", "opener", "opera", "outerHeight", "outerWidth", "pageXOffset",
      "pageYOffset", "parent", "print", "removeEventListener", "resizeBy",
      "resizeTo", "screen", "screenLeft", "screenTop", "screenX", "screenY",
      "scroll", "scrollbars", "scrollBy", "scrollTo", "scrollX", "scrollY",
      "self", "sessionStorage", "status", "statusbar", "stop",
      "toolbar", "top"],
    "no-tabs": "error",
    "no-useless-escape": "off",
    "no-whitespace-before-property": "error",
    "no-trailing-spaces": [
      "error"
    ],
    "no-undef": [
      "off"
    ],
    "no-unused-vars": [
      "off"
    ],
    "one-var": [
      "off"
    ],
    "operator-linebreak": [
      "error",
      "after"
    ],
    "padded-blocks": [
      "error",
      "never"
    ],
    "quotes": [
      "error",
      "single",
      {
        "avoidEscape": true
      }
    ],
    "quote-props": [
      "error",
      "as-needed",
      {
        "keywords": true
      }
    ],
    // The following must be off so that we can enable
    // "@typescript-eslint/semi", which checks semicolons in TS files.
    "semi": "off",
    // The following must be off so that we can enable
    // "@typescript-eslint/no-extra-semi".
    "no-extra-semi": "off",
    "semi-spacing": "error",
    "space-before-blocks": [
      "error",
      "always"
    ],
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "never",
        "asyncArrow": "never",
        "named": "never"
      }
    ],
    "spaced-comment": [
      "error",
      "always"
    ],
    "space-in-parens": [
      "error",
      "never"
    ],
    "space-infix-ops": [
      "error"
    ],
    "space-unary-ops": [
      "error",
      {
        "words": true,
        "nonwords": false
      }
    ],
    "switch-colon-spacing": [
      "error",
      {
        "after": true,
        "before": false
      }
    ],
    "unused-imports/no-unused-imports-ts": "error",
    "@typescript-eslint/no-explicit-any": ["error"],
    "@typescript-eslint/semi": ["error"],
    "@typescript-eslint/ban-types": [
      "error",
      {
        "types": {
          "String": {
            "message": "Use string instead.",
            "fixWith": "string"
          },
          "Number": {
            "message": "Use number instead.",
            "fixWith": "number"
          },
          "Boolean": {
            "message": "Use boolean instead.",
            "fixWith": "boolean"
          }
        },
        "extendDefaults": false
      }
    ],
    "@typescript-eslint/array-type": [
      "error",
      {
        "default": "array"
      }
    ],
    "@typescript-eslint/no-non-null-assertion": ["error"],
    "@typescript-eslint/no-non-null-asserted-optional-chain": ["error"],
    "@typescript-eslint/prefer-namespace-keyword": ["error"],
    "@typescript-eslint/triple-slash-reference": ["error"],
    "@typescript-eslint/adjacent-overload-signatures": ["error"],
    "@typescript-eslint/no-extra-non-null-assertion": ["error"],
    "@typescript-eslint/no-misused-new": ["error"],
    "@typescript-eslint/no-unused-vars": [
      "error",
      {
        "args": "none"
      }
    ],
    "@typescript-eslint/explicit-module-boundary-types": ["error"],
    "@typescript-eslint/prefer-as-const": ["error"],
    "@typescript-eslint/no-array-constructor": ["error"],
    "@typescript-eslint/no-extra-semi": ["error"],
    "@typescript-eslint/type-annotation-spacing": ["error"],
    "wrap-iife": [
      "error",
      "any"
    ]
  }
}