eslint.config.js

const js = require('@eslint/js');
const globals = require('globals');

const rules = {
    // Require `let` or `const` instead of `var`
    // https://eslint.org/docs/rules/no-var
    'no-var': 'error',

    // Require `const` declarations for variables that are never reassigned after declared
    // https://eslint.org/docs/rules/prefer-const
    'prefer-const': 'error',

    // This option sets a specific tab width for your code
    // https://eslint.org/docs/rules/indent
    'indent': ['error', 4],

    // Disallow mixed 'LF' and 'CRLF' as linebreaks
    // https://eslint.org/docs/rules/linebreak-style
    'linebreak-style': ['error', 'unix'],

    // Specify whether double or single quotes should be used
    'quotes': ['error', 'single'],

    // Require or disallow use of semicolons instead of ASI
    'semi': ['error', 'always'],

    // Enforce location of semicolons
    // https://eslint.org/docs/rules/semi-style
    'semi-style': ['error', 'last'],

    // Require camel case names
    // https://eslint.org/docs/rules/camelcase
    'camelcase': ['error', { 'properties': 'always' }],

    // Use type-safe equality operators
    // https://eslint.org/docs/rules/eqeqeq
    'eqeqeq': ['error', 'always'],

    // Require newlines around variable declarations
    // https://eslint.org/docs/rules/one-var-declaration-per-line
    'one-var-declaration-per-line': ['error', 'always'],

    // Require constructor names to begin with a capital letter
    // https://eslint.org/docs/rules/new-cap
    'new-cap': 'error',

    // Disallow Use of alert, confirm, prompt
    // https://eslint.org/docs/rules/no-alert
    'no-alert': 'error',

    // Disallow eval()
    // https://eslint.org/docs/rules/no-eval
    'no-eval': 'error',

    // Disallow empty functions
    // https://eslint.org/docs/rules/no-empty-function
    'no-empty-function': 'error',

    // Require radix parameter
    // https://eslint.org/docs/rules/radix
    'radix': 'error',

    // Disallow the use of `console`
    // https://eslint.org/docs/rules/no-console
    'no-console': 'error'
};

const testingGlobals = {
    sinon: true
};

module.exports = [
    js.configs.recommended,
    {
        ignores: ['dist/**/*.js', 'package/**/*.js', 'static/**/*.js', 'theme/static/**/*.js', 'tests/dist/**/*.js'],
    },
    {
        files: ['assets/js/**/*.js'],
        languageOptions: {
            ecmaVersion: 2017,
            globals: {
                Mozilla: true,
                ...globals.browser,
                ...globals.commonjs
            }
        },
        rules: rules
    },
    {
        files: ['theme/**/*.js'],
        languageOptions: {
            ecmaVersion: 2017,
            globals: {
                Mozilla: true,
                ...globals.browser,
                ...globals.commonjs,
                ...globals.node
            }
        },
        rules: rules
    },
    {
        files: ['tests/**/*.js'],
        languageOptions: {
            ecmaVersion: 'latest',
            sourceType: 'module',
            globals: {
                Mozilla: true,
                ...globals.browser,
                ...globals.jasmine,
                ...globals.commonjs,
                ...testingGlobals
            }
        },
        rules: rules
    },
    {
        files: [
            'eslint.config.js',
            'fractal.config.js',
            'webpack.docs.build.config.js',
            'webpack.docs.static.config.js',
            'webpack.entrypoints.js',
            'webpack.package.build.config.js',
            'webpack.package.static.config.js',
            'webpack.test.config.js'
        ],
        languageOptions: {
            ecmaVersion: 'latest',
            globals: {
                ...globals.node,
                ...globals.commonjs
            }
        },
        rules: rules
    }
];