RocketChat/Rocket.Chat

module.exports = {
    env: {
        es6: true,
    },
    parserOptions: {
        ecmaVersion: 6,
        sourceType: 'module',
        ecmaFeatures: {
            generators: false,
            objectLiteralDuplicateProperties: false,
        },
    },

    rules: {
        // enforces no braces where they can be omitted
        // https://eslint.org/docs/rules/arrow-body-style
        // TODO: enable requireReturnForObjectLiteral?
        'arrow-body-style': [
            'error',
            'as-needed',
            {
                requireReturnForObjectLiteral: false,
            },
        ],

        // require parens in arrow function arguments
        // https://eslint.org/docs/rules/arrow-parens
        'arrow-parens': ['error', 'always'],

        // require space before/after arrow function's arrow
        // https://eslint.org/docs/rules/arrow-spacing
        'arrow-spacing': ['error', { before: true, after: true }],

        // // verify super() callings in constructors
        // 'constructor-super': 'error',

        // // enforce the spacing around the * in generator functions
        // // https://eslint.org/docs/rules/generator-star-spacing
        // 'generator-star-spacing': ['error', { before: false, after: true }],

        // // disallow modifying variables of class declarations
        // // https://eslint.org/docs/rules/no-class-assign
        // 'no-class-assign': 'error',

        // disallow arrow functions where they could be confused with comparisons
        // https://eslint.org/docs/rules/no-confusing-arrow
        'no-confusing-arrow': [
            'error',
            {
                allowParens: true,
            },
        ],

        // disallow modifying variables that are declared using const
        'no-const-assign': 'error',

        // disallow duplicate class members
        // https://eslint.org/docs/rules/no-dupe-class-members
        'no-dupe-class-members': 'error',

        // disallow importing from the same path more than once
        // https://eslint.org/docs/rules/no-duplicate-imports
        // replaced by https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-duplicates.md
        'no-duplicate-imports': 'off',

        // // disallow symbol constructor
        // // https://eslint.org/docs/rules/no-new-symbol
        // 'no-new-symbol': 'error',

        // // disallow specific imports
        // // https://eslint.org/docs/rules/no-restricted-imports
        // 'no-restricted-imports': ['off', {
        //   paths: [],
        //   patterns: []
        // }],

        // disallow to use this/super before super() calling in constructors.
        // https://eslint.org/docs/rules/no-this-before-super
        'no-this-before-super': 'error',

        // disallow useless computed property keys
        // https://eslint.org/docs/rules/no-useless-computed-key
        'no-useless-computed-key': 'error',

        // disallow unnecessary constructor
        // https://eslint.org/docs/rules/no-useless-constructor
        'no-useless-constructor': 'error',

        // disallow renaming import, export, and destructured assignments to the same name
        // https://eslint.org/docs/rules/no-useless-rename
        'no-useless-rename': [
            'error',
            {
                ignoreDestructuring: false,
                ignoreImport: false,
                ignoreExport: false,
            },
        ],

        // require let or const instead of var
        'no-var': 'error',

        // require method and property shorthand syntax for object literals
        // https://eslint.org/docs/rules/object-shorthand
        'object-shorthand': 'error',

        // // suggest using arrow functions as callbacks
        // 'prefer-arrow-callback': ['error', {
        //   allowNamedFunctions: false,
        //   allowUnboundThis: true,
        // }],

        // suggest using of const declaration for variables that are never modified after declared
        'prefer-const': [
            'error',
            {
                destructuring: 'any',
                ignoreReadBeforeAssign: true,
            },
        ],

        // Prefer destructuring from arrays and objects
        // https://eslint.org/docs/rules/prefer-destructuring
        'prefer-destructuring': [
            'error',
            {
                VariableDeclarator: {
                    array: false,
                    object: true,
                },
                AssignmentExpression: {
                    array: false,
                    object: false,
                },
            },
            {
                enforceForRenamedProperties: false,
            },
        ],

        // // disallow parseInt() in favor of binary, octal, and hexadecimal literals
        // // https://eslint.org/docs/rules/prefer-numeric-literals
        // 'prefer-numeric-literals': 'error',

        // // suggest using Reflect methods where applicable
        // // https://eslint.org/docs/rules/prefer-reflect
        // 'prefer-reflect': 'off',

        // use rest parameters instead of arguments
        // https://eslint.org/docs/rules/prefer-rest-params
        'prefer-rest-params': 'error',

        // // suggest using the spread operator instead of .apply()
        // // https://eslint.org/docs/rules/prefer-spread
        // 'prefer-spread': 'error',

        // suggest using template literals instead of string concatenation
        // https://eslint.org/docs/rules/prefer-template
        'prefer-template': 'error',

        // // disallow generator functions that do not have yield
        // // https://eslint.org/docs/rules/require-yield
        // 'require-yield': 'error',

        // enforce spacing between object rest-spread
        // https://eslint.org/docs/rules/rest-spread-spacing
        'rest-spread-spacing': ['error', 'never'],

        // // import sorting
        // // https://eslint.org/docs/rules/sort-imports
        // 'sort-imports': ['off', {
        //   ignoreCase: false,
        //   ignoreMemberSort: false,
        //   memberSyntaxSortOrder: ['none', 'all', 'multiple', 'single'],
        // }],

        // // require a Symbol description
        // // https://eslint.org/docs/rules/symbol-description
        // 'symbol-description': 'error',

        // enforce usage of spacing in template strings
        // https://eslint.org/docs/rules/template-curly-spacing
        'template-curly-spacing': ['error', 'always'],

        // // enforce spacing around the * in yield* expressions
        // // https://eslint.org/docs/rules/yield-star-spacing
        // 'yield-star-spacing': ['error', 'after']
    },
};