.eslintrc.js

module.exports = {
    extends: ['airbnb-base', 'prettier'],
    env: {
        browser: true,
        node: true,
        jest: true,
        es6: true,
    },
    globals: {
        describe: false,
        it: false,
        expect: false,
    },
    rules: {
        indent: [
            'error',
            4,
            {
                ignoredNodes: ['TemplateLiteral'],
            },
        ],
        camelcase: [
            'error',
            {
                properties: 'never',
            },
        ],
        semi: ['warn', 'always'],
        'max-params': ['warn', 5],
        'max-depth': ['warn', 4],
        'max-statements': ['warn', 20],
        'linebreak-style': ['warn', 'unix'],
        'class-methods-use-this': 'off',
        'comma-style': ['warn', 'last'],
        'no-mixed-spaces-and-tabs': ['warn'],
        'no-prototype-builtins': 'off',

        'no-return-assign': ['error', 'except-parens'],
        'no-restricted-syntax': [
            'error',
            'ForInStatement',
            'LabeledStatement',
            'WithStatement',
        ],
        'no-unused-vars': [
            'error',
            {
                ignoreRestSiblings: true,
                argsIgnorePattern: 'res|next|^err',
            },
        ],
        'prefer-const': [
            'error',
            {
                destructuring: 'all',
            },
        ],
        'arrow-body-style': ['error', 'as-needed'],
        'no-unused-expressions': [
            'error',
            {
                allowTaggedTemplates: true,
            },
        ],
        'no-param-reassign': [
            'error',
            {
                props: false,
            },
        ],
        'max-len': [
            'error',
            {
                code: 120,
                comments: 80,
                tabWidth: 4,
            },
        ],
        'no-shadow': [
            'error',
            {
                hoist: 'all',
                allow: ['resolve', 'reject', 'done', 'next', 'err', 'error'],
            },
        ],
        quotes: [
            'error',
            'single',
            {
                avoidEscape: true,
                allowTemplateLiterals: true,
            },
        ],
        'import/prefer-default-export': 'off',
        'prettier/prettier': [
            'error',
            {
                trailingComma: 'es5',
                singleQuote: true,
                printWidth: 80,
            },
        ],
        'vars-on-top': 'error',
        'valid-jsdoc': [
            'error',
            {
                prefer: {
                    arg: 'param',
                    argument: 'param',
                    class: 'constructor',
                    return: 'return',
                    virtual: 'abstract',
                },
                preferType: {
                    Boolean: 'boolean',
                    Number: 'number',
                    Object: 'object',
                    String: 'string',
                },
                requireReturn: false,
                matchDescription: '.+',
                requireParamDescription: false,
                requireReturnDescription: false,
            },
        ],
    },
    plugins: ['html', 'prettier'],
};