.eslintrc.js

const error = 'error'
const readonly = 'readonly'
const always = 'always'
const never = 'never'

module.exports = {
    extends: 'eslint:recommended',

    env: {
        browser: true,
        es2021: true
    },

    parserOptions: {
        ecmaVersion: 12,
        sourceType: 'module'
    },
    
    globals: {
        describe: readonly,
        it: readonly,
        beforeEach: readonly,
        afterEach: readonly
    },

    rules: {
        indent: [error, 2],
        'linebreak-style': [error, 'unix'],
        quotes: [error, 'single'],
        semi: [error, never],

        'block-scoped-var': [error],
        complexity: [error, 4],
        'dot-location': [error, 'object'],
        eqeqeq: [error, always],
        'no-else-return': [error],
        'no-multi-spaces': [error, { ignoreEOLComments: true }],
        'no-octal': [error],
        'no-octal-escape': [error],
        'no-return-assign': [error, always],
        'no-sequences': [error],
        'no-useless-concat': [error],
        'no-useless-return': [error],
        radix: [error],
        yoda: [error],

        'no-label-var': [error],
        'brace-style': [error, '1tbs', {allowSingleLine: true}],
        'comma-spacing': [error, {before: false, after: true}],
        'comma-style': [error, 'last'],
        'func-call-spacing': [error, never],
        'key-spacing': [error, {beforeColon: false, afterColon:true}],
        'keyword-spacing': [error],
        'max-depth': [error, 4],
        'max-len': [error, {code: 100, comments: 100, ignoreUrls: true}],
        'max-lines': [error, {max: 200, skipBlankLines: true, skipComments: false}],
        'max-lines-per-function': [error, {max: 200, skipBlankLines: true, skipComments: true, IIFEs: false}],
        'max-nested-callbacks': [error, 4],
        'max-params': [error, 4],
        'max-statements': [error, 10],
        'max-statements-per-line': [error, {max: 2}],
        'new-cap': [error],
        'new-parens': [error, always],
        'no-array-constructor': [error],
        'no-bitwise': [error],
        'no-lonely-if': [error],
        'no-multi-assign': [error],
        'no-multiple-empty-lines': [error, {max: 3, maxBOF: 1, maxEOF: 1}],
        'no-nested-ternary': [error],
        'no-new-object': [error],
        'no-tabs': [error],
        'no-trailing-spaces': [error],
        'no-unneeded-ternary': [error],
        'no-whitespace-before-property': [error],
        'nonblock-statement-body-position': [error, 'beside'],
        'prefer-exponentiation-operator': [error],
        'quote-props': [error, 'as-needed'],
        'semi-spacing': [error],
        'semi-style': [error],
        'space-before-function-paren': [error, never],
        'space-infix-ops': [error],
        'spaced-comment': [error, always],
        'switch-colon-spacing': [error],
        'no-duplicate-imports': [error],
        'no-useless-computed-key': [error],
        'no-useless-constructor': [error],
        'no-var': [error],
        'prefer-const': [error],
        'prefer-rest-params': [error]

    }
}