.eslintrc.js

module.exports = {
    env: {
        node: true,
        es6: true,
        mocha: true,
    },
    parserOptions: {
        ecmaVersion: 2018,
        sourceType: 'module',
        ecmaFeatures: {
            impliedStrict: true,
        },
    },
    plugins: ['prettier'],
    rules: {
        'block-scoped-var': 2,
        'brace-style': 2,
        camelcase: [2, { properties: 'never' }],
        'comma-dangle': [
            1,
            {
                arrays: 'always-multiline',
                objects: 'always-multiline',
                imports: 'never',
                exports: 'never',
                functions: 'never',
            },
        ],
        'comma-style': 2,
        complexity: [1, { max: 32 }],
        'consistent-this': [2, 'self'],
        curly: [2, 'all'],
        'dot-notation': [2, { allowKeywords: true }],
        eqeqeq: 2,
        'key-spacing': [2, { beforeColon: false, afterColon: true }],
        'keyword-spacing': 2,
        'max-len': [
            2,
            120,
            4,
            { ignoreComments: true, ignoreUrls: true, ignoreStrings: true, ignoreTemplateLiterals: true },
        ],
        'max-params': [1, { max: 6 }],
        'new-cap': [2, { newIsCap: true, capIsNew: false }],
        'no-bitwise': 2,
        'no-caller': 2,
        'no-cond-assign': 2,
        'no-console': 2,
        'no-debugger': 2,
        'no-dupe-keys': 2,
        'no-else-return': 1,
        'no-empty': 2,
        'no-eval': 2,
        'no-iterator': 2,
        'no-loop-func': 2,
        'no-mixed-spaces-and-tabs': 2,
        'no-multi-str': 2,
        'no-new': 2,
        'no-proto': 2,
        'no-script-url': 2,
        'no-shadow': 0,
        'no-trailing-spaces': 1,
        'no-undef': 2,
        'no-unused-vars': [2, { vars: 'all', args: 'after-used' }],
        'no-use-before-define': [2, 'nofunc'],
        'no-var': 2,
        'padded-blocks': [2, 'never'],
        'prefer-const': 2,
        'no-const-assign': 2,
        'require-await': 1,
        semi: [2, 'always'],
        'space-before-blocks': 2,
        'spaced-comment': [2, 'always', { markers: ['global'] }],
        'valid-jsdoc': [2, { requireReturn: false }],
        'wrap-iife': [2, 'inside'],
        yoda: 2,
        'prettier/prettier': [
            'error',
            {
                singleQuote: true,
                printWidth: 120,
                tabWidth: 4,
                trailingComma: 'es5',
            },
        ],
    },
};