.eslintrc.js

/**
 * @file    .eslintrc.js - ESLint configuration file, following the Core Team's JS Style Guide.
 * @author  Wes Garland <wes@distributive.network>
 * @date    Mar. 2022, July 2023
 */

/** 
 * @see {@link https://eslint.org/docs/latest/use/configure/}
 * @type {import('eslint').Linter.Config}
 */
module.exports = {
  extends: 'eslint:recommended',
  globals: {
    'python': true
  },
  env: {
    browser: true,
    commonjs: true,
    es2021: true,
    node: true
  },
  parserOptions: {
    ecmaVersion: 13,
    sourceType: 'script',
  },
  rules: {
    'indent':                                   [ 'warn', 2, {
      SwitchCase: 1,
      ignoredNodes: ['CallExpression', 'ForStatement'],
    }],
    'linebreak-style':                          [ 'error', 'unix' ],
    'func-call-spacing':                        [ 'off', 'never' ],
    'no-prototype-builtins':                    'off',
    'quotes':                                   [ 'warn', 'single', 'avoid-escape' ],
    'no-empty': [ 'warn' ],
    'no-multi-spaces':                          [ 'off' ],
    'prettier/prettier':                        [ 'off' ],
    'vars-on-top':                              [ 'error' ],
    'no-var':                                   [ 'off' ],
    'spaced-comment':                           [ 'warn' ],
    'brace-style':                              [ 'warn', 'allman' ],
    'no-eval':                                  [ 'error' ],
    'object-curly-spacing':                     [ 'warn',       'always' ],
    'eqeqeq':                                   [ 'warn',       'always' ],
    'no-constant-condition':                    [ 'warn' ],
    'no-extra-boolean-cast':                    [ 'warn' ],
    'no-sparse-arrays':                         [ 'off' ],
    'no-inner-declarations':                    [ 'off' ],
    'no-loss-of-precision':                     [ 'warn' ],
    'require-atomic-updates':                   [ 'warn' ],
    'no-dupe-keys':                             [ 'warn' ],
    'no-dupe-class-members':                    [ 'warn' ],
    'no-fallthrough':                           [ 'warn',       { commentPattern: 'fall[ -]*through' }],
    'no-invalid-this':                          [ 'error' ],
    'no-return-assign':                         [ 'error' ],
    'no-return-await':                          [ 'warn' ],
    'no-unused-expressions':                    [ 'warn',       { allowShortCircuit: true, allowTernary: true } ],
    'prefer-promise-reject-errors':             [ 'error' ],
    'no-throw-literal':                         [ 'error' ],
    'semi':                                     [ 'warn'  ],
    'semi-style':                               [ 'warn',       'last' ],
    'semi-spacing':                             [ 'error',      { 'before': false, 'after': true }],
    'no-extra-semi':                            [ 'warn' ],
    'no-tabs':                                  [ 'error' ],
    'symbol-description':                       [ 'error' ],
    'operator-linebreak':                       [ 'warn',       'before' ],
    'new-cap':                                  [ 'warn' ],
    'consistent-this':                          [ 'error',      'that' ],
    'no-shadow':                                [ 'error' ],
    'no-label-var':                             [ 'error' ],
    'radix':                                    [ 'error' ],
    'no-self-compare':                          [ 'error' ],
    'require-await':                            [ 'error' ],
    'require-yield':                            [ 'error' ],
    'no-promise-executor-return':               [ 'off' ],
    'no-template-curly-in-string':              [ 'warn' ],
    'no-unmodified-loop-condition':             [ 'warn' ],
    'no-unused-private-class-members':          [ 'warn' ],
    'no-use-before-define':                     [ 'error',      { functions: false, classes: true, variables: true }],
    'no-implicit-coercion':                     [1, {
      disallowTemplateShorthand: false,
      boolean: true,
      number: true,
      string: true,
      allow: ['!!'] /* really only want to allow if(x) and if(!x) but not if(!!x) */
    }],
    'no-trailing-spaces': [ 'off', {
      skipBlankLines: true,
      ignoreComments: true
    }],
    'no-unused-vars':                           ['warn',        {
      vars: 'all',
      args: 'none',
      ignoreRestSiblings: false
    }],
  }
};