zulip/.eslintrc.json

{
    "env": {
        "node": true,
        "es6": true
    },
    "extends": [
        "eslint:recommended"
    ],
    "parserOptions": {
        "ecmaVersion": 2019,
        "warnOnUnsupportedTypeScriptVersion": false,
        "sourceType": "module"
    },
    "plugins": [
        "eslint-plugin-empty-returns"
    ],
    "rules": {
        "array-callback-return": "error",
        "array-bracket-spacing": "error",
        "arrow-spacing": [ "error", { "before": true, "after": true } ],
        "block-scoped-var": "error",
        "brace-style": [ "error", "1tbs", { "allowSingleLine": true } ],
        "comma-dangle": [ "error",
            {
                "arrays": "always-multiline",
                "objects": "always-multiline",
                "imports": "always-multiline",
                "exports": "always-multiline",
                "functions": "never"
            }
        ],
        "comma-spacing": [ "error",
            {
                "before": false,
                "after": true
            }
        ],
        "curly": "error",
        "dot-notation": "error",
        "empty-returns/main": "error",
        "eol-last": "error",
        "eqeqeq": "error",
        "guard-for-in": "error",
        "indent": ["error", 4, {
            "ArrayExpression": "first",
            "ObjectExpression": "first",
            "CallExpression": {"arguments": "first"},
            "FunctionExpression": {"parameters": "first"},
            "FunctionDeclaration": {"parameters": "first"}
        }],
        "key-spacing": "error",
        "keyword-spacing": "error",
        "max-len": [ "error", 100, 2,
            {
                "ignoreUrls": true,
                "ignoreRegExpLiterals": true,
                "ignoreStrings": true,
                "ignoreTemplateLiterals": true
            }
        ],
        "new-cap": [ "error",
            {
                "capIsNew": false
            }
        ],
        "new-parens": "error",
        "no-alert": "error",
        "no-array-constructor": "error",
        "no-bitwise": "error",
        "no-caller": "error",
        "no-catch-shadow": "error",
        "no-constant-condition": ["error", {"checkLoops": false}],
        "no-div-regex": "error",
        "no-duplicate-imports": "error",
        "no-else-return": "error",
        "no-eq-null": "error",
        "no-eval": "error",
        "no-extra-parens": "error",
        "no-floating-decimal": "error",
        "no-implied-eval": "error",
        "no-inner-declarations": "off",
        "no-iterator": "error",
        "no-label-var": "error",
        "no-labels": "error",
        "no-loop-func": "error",
        "no-multi-str": "error",
        "no-native-reassign": "error",
        "no-new-func": "error",
        "no-new-object": "error",
        "no-new-wrappers": "error",
        "no-octal-escape": "error",
        "no-plusplus": "error",
        "no-proto": "error",
        "no-return-assign": "error",
        "no-script-url": "error",
        "no-self-compare": "error",
        "no-sync": "error",
        "no-trailing-spaces": "error",
        "no-undef-init": "error",
        "no-unneeded-ternary": [ "error", { "defaultAssignment": false } ],
        "no-unused-expressions": "error",
        "no-unused-vars": [ "error",
            {
                "vars": "local",
                "varsIgnorePattern": "print_elapsed_time|check_duplicate_ids"
            }
        ],
        "no-use-before-define": "error",
        "no-useless-constructor": "error",
        // The Zulip codebase complies partially with the "no-useless-escape"
        // rule; only regex expressions haven't been updated yet.
        // Updated regex expressions are currently being tested in casper
        // files and will decide about a potential future enforcement of this rule.
        "no-useless-escape": "off",
        "no-var": "error",
        "space-unary-ops": "error",
        "no-whitespace-before-property": "error",
        "one-var": [ "error", "never" ],
        "prefer-const": [ "error",
            {
                "ignoreReadBeforeAssign": true
            }
        ],
        "quote-props": [ "error", "as-needed" ],
        "radix": "error",
        "semi": "error",
        "semi-spacing": "error",
        "sort-imports": "error",
        "space-before-blocks": "error",
        "space-before-function-paren": [ "error",
            {
                "anonymous": "always",
                "named": "never",
                "asyncArrow": "always"
            }
        ],
        "space-in-parens": "error",
        "space-infix-ops": "error",
        "spaced-comment": "off",
        "strict": "off",
        "template-curly-spacing": "error",
        "valid-typeof": [ "error", { "requireStringLiterals": true } ],
        "wrap-iife": "error",
        "yoda": "error"
    },
    "overrides": [
        {
            "files": [
                "frontend_tests/**/*.{js,ts}",
                "static/js/**/*.{js,ts}"
            ],
            "globals": {
                "$": false,
                "ClipboardJS": false,
                "FetchStatus": false,
                "Filter": false,
                "Handlebars": false,
                "LightboxCanvas": false,
                "MessageListData": false,
                "MessageListView": false,
                "Plotly": false,
                "Sortable": false,
                "WinChan": false,
                "XDate": false,
                "_": false,
                "activity": false,
                "admin": false,
                "alert_words": false,
                "alert_words_ui": false,
                "attachments_ui": false,
                "avatar": false,
                "billing": false,
                "blueslip": false,
                "bot_data": false,
                "bridge": false,
                "buddy_data": false,
                "buddy_list": false,
                "channel": false,
                "click_handlers": false,
                "color_data": false,
                "colorspace": false,
                "common": false,
                "components": false,
                "compose": false,
                "compose_actions": false,
                "compose_fade": false,
                "compose_pm_pill": false,
                "compose_state": false,
                "compose_ui": false,
                "composebox_typeahead": false,
                "condense": false,
                "confirm_dialog": false,
                "copy_and_paste": false,
                "csrf_token": false,
                "current_msg_list": true,
                "drafts": false,
                "dropdown_list_widget": false,
                "echo": false,
                "emoji": false,
                "emoji_picker": false,
                "favicon": false,
                "feature_flags": false,
                "feedback_widget": false,
                "fenced_code": false,
                "flatpickr": false,
                "floating_recipient_bar": false,
                "gear_menu": false,
                "hash_util": false,
                "hashchange": false,
                "helpers": false,
                "history": false,
                "home_msg_list": false,
                "hotspots": false,
                "i18n": false,
                "info_overlay": false,
                "input_pill": false,
                "invite": false,
                "jQuery": false,
                "katex": false,
                "keydown_util": false,
                "lightbox": false,
                "list_cursor": false,
                "list_render": false,
                "list_util": false,
                "loading": false,
                "localStorage": false,
                "local_message": false,
                "localstorage": false,
                "location": false,
                "markdown": false,
                "marked": false,
                "md5": false,
                "message_edit": false,
                "message_events": false,
                "message_fetch": false,
                "message_flags": false,
                "message_list": false,
                "message_live_update": false,
                "message_scroll": false,
                "message_store": false,
                "message_util": false,
                "message_viewport": false,
                "moment": false,
                "muting": false,
                "muting_ui": false,
                "narrow": false,
                "narrow_state": false,
                "navigate": false,
                "night_mode": false,
                "notifications": false,
                "overlays": false,
                "padded_widget": false,
                "page_params": false,
                "panels": false,
                "people": false,
                "pm_conversations": false,
                "pm_list": false,
                "pm_list_dom": false,
                "pointer": false,
                "popovers": false,
                "presence": false,
                "reactions": false,
                "realm_icon": false,
                "realm_logo": false,
                "realm_night_logo": false,
                "recent_senders": false,
                "recent_topics": false,
                "reload": false,
                "reload_state": false,
                "reminder": false,
                "resize": false,
                "rows": false,
                "rtl": false,
                "run_test": false,
                "schema": false,
                "scroll_bar": false,
                "scroll_util": false,
                "search": false,
                "search_pill": false,
                "search_pill_widget": false,
                "search_suggestion": false,
                "search_util": false,
                "sent_messages": false,
                "server_events": false,
                "server_events_dispatch": false,
                "settings": false,
                "settings_account": false,
                "settings_bots": false,
                "settings_display": false,
                "settings_emoji": false,
                "settings_exports": false,
                "settings_linkifiers": false,
                "settings_invites": false,
                "settings_muting": false,
                "settings_notifications": false,
                "settings_org": false,
                "settings_panel_menu": false,
                "settings_profile_fields": false,
                "settings_sections": false,
                "settings_streams": false,
                "settings_toggle": false,
                "settings_ui": false,
                "settings_user_groups": false,
                "settings_users": false,
                "starred_messages": false,
                "stream_color": false,
                "stream_create": false,
                "stream_data": false,
                "stream_edit": false,
                "stream_events": false,
                "stream_topic_history": false,
                "stream_list": false,
                "stream_muting": false,
                "stream_popover": false,
                "stream_sort": false,
                "stream_ui_updates": false,
                "StripeCheckout": false,
                "submessage": false,
                "subs": false,
                "tab_bar": false,
                "templates": false,
                "tictactoe_widget": false,
                "timerender": false,
                "todo_widget": false,
                "top_left_corner": false,
                "topic_generator": false,
                "topic_list": false,
                "topic_zoom": false,
                "transmit": false,
                "tutorial": false,
                "typeahead_helper": false,
                "typing": false,
                "typing_data": false,
                "typing_events": false,
                "ui": false,
                "ui_init": false,
                "ui_report": false,
                "ui_util": false,
                "unread": false,
                "unread_ops": false,
                "unread_ui": false,
                "upgrade": false,
                "upload": false,
                "upload_widget": false,
                "user_events": false,
                "user_groups": false,
                "user_pill": false,
                "user_search": false,
                "user_status": false,
                "user_status_ui": false,
                "poll_widget": false,
                "vdom": false,
                "widgetize": false,
                "zcommand": false,
                "zform": false,
                "zxcvbn": false
            }
        },
        {
            "files": [
                "frontend_tests/casper_tests/*.js",
                "frontend_tests/casper_lib/*.js"
            ],
            "rules": {
                "no-var": "off" // PhantomJS doesn’t support let, const
            }
        },
        {
            "files": ["**/*.ts"],
            "extends": [
                "plugin:@typescript-eslint/recommended"
            ],
            "parserOptions": {
                "project": "tsconfig.json"
            },
            "rules": {
                // Disable base rule to avoid conflict
                "empty-returns/main": "off",
                "indent": "off",
                "no-extra-parens": "off",
                "semi": "off",
                "no-unused-vars": "off",
                "no-useless-constructor": "off",

                "@typescript-eslint/array-type": "error",
                "@typescript-eslint/await-thenable": "error",
                "@typescript-eslint/camelcase": "off",
                "@typescript-eslint/class-name-casing": "error",
                "@typescript-eslint/consistent-type-assertions": "error",
                "@typescript-eslint/explicit-function-return-type": ["error", { "allowExpressions": true }],
                "@typescript-eslint/func-call-spacing": "error",
                "@typescript-eslint/indent": "error",
                "@typescript-eslint/member-delimiter-style": "error",
                "@typescript-eslint/member-naming": ["error", { "private": "^_" } ],
                "@typescript-eslint/member-ordering": "error",
                "@typescript-eslint/no-explicit-any": "off",
                "@typescript-eslint/no-extra-parens": ["error", "all"],
                "@typescript-eslint/no-extraneous-class": "error",
                "@typescript-eslint/no-non-null-assertion": "off",
                "@typescript-eslint/no-parameter-properties": "error",
                "@typescript-eslint/no-unnecessary-qualifier": "error",
                "@typescript-eslint/no-unnecessary-type-assertion": "error",
                "@typescript-eslint/no-unused-vars": ["error", { "varsIgnorePattern": "^_" } ],
                "@typescript-eslint/no-use-before-define": "error",
                "@typescript-eslint/no-useless-constructor": "error",
                "@typescript-eslint/prefer-includes": "error",
                "@typescript-eslint/prefer-regexp-exec": "error",
                "@typescript-eslint/prefer-string-starts-ends-with": "error",
                "@typescript-eslint/promise-function-async": "error",
                "@typescript-eslint/semi": "error",
                "@typescript-eslint/type-annotation-spacing": "error",
                "@typescript-eslint/unified-signatures": "error"
            }
        }
    ]
}