.eslintrc.yml

# Use recommended rules
extends: eslint:recommended

# Environment
env:
  node: yes
  es2021: yes
parserOptions:
  ecmaVersion: 2021
  sourceType: module

# Globally defined variables
globals:
  # Puppeteer variables
  document: readonly
  window: readonly
  XMLSerializer: readonly

# Rules
rules:

  # Avoid useless statements
  no-unused-vars: [error, {argsIgnorePattern: "^_"}]
  no-unused-expressions: error
  no-return-await: error
  no-empty-function: error
  no-useless-call: error
  no-useless-constructor: error
  no-useless-concat: error
  no-useless-computed-key: error
  no-useless-backreference: error
  no-self-compare: error
  no-extra-label: error
  no-undef-init: error

  # Avoid visual pollution
  semi: [error, never]
  semi-spacing: error
  semi-style: [error, first]
  curly: [error, multi-or-nest]
  dot-notation: error

  # Avoid confusing code
  no-label-var: error
  no-bitwise: error
  new-cap: error
  new-parens: error
  func-name-matching: error
  no-extend-native: error
  no-extra-bind: error

  # Avoid deprecated or legacy JavaScript
  no-var: error
  no-caller: error
  no-alert: error
  no-script-url: error
  no-eval: error
  no-implied-eval: error
  no-implicit-globals: error
  no-proto: error
  no-iterator: error
  no-new-object: error

  # Code integrity
  no-unsafe-optional-chaining: error
  no-duplicate-imports: error
  eqeqeq: error

  # Code simplicity
  max-depth: [error, 10]
  max-nested-callbacks: error
  max-params: [error, 3]
  max-statements-per-line: error
  newline-per-chained-call: [error, {ignoreChainWithDepth: 6}]
  object-shorthand: error

  # Code readability
  default-case-last: error
  default-param-last: error
  no-else-return: error
  no-lonely-if: error
  no-multiple-empty-lines: error
  no-multi-str: error
  no-multi-assign: error
  no-inline-comments: error
  yoda: error
  max-classes-per-file: [error, 1]
  grouped-accessor-pairs: error

  # Prefer using new syntax and features
  prefer-regex-literals: error
  prefer-arrow-callback: error
  prefer-destructuring: error
  prefer-numeric-literals: error
  prefer-exponentiation-operator: error
  prefer-spread: error
  prefer-object-spread: error
  prefer-template: error

  # Allow additional features
  no-ex-assign: off
  no-unsafe-finally: off

  # =========================================================================

  # Code style (general rules)
  no-tabs: error
  no-trailing-spaces: error
  brace-style: [error, stroustrup]
  comma-style: error
  sort-vars: error
  no-async-promise-executor: off
  no-misleading-character-class: off

  # Coding style (quoting rules)
  quote-props: [error, as-needed, {numbers: true}]
  quotes: [error, double, {avoidEscape: true}]
  template-curly-spacing: error

  # Coding style (comments rules)
  line-comment-position: error

  # Coding style (spacing rules)
  block-spacing: [error, always]
  comma-spacing: error
  func-call-spacing: error
  arrow-spacing: error
  generator-star-spacing: error
  object-curly-spacing: [warn, never]
  rest-spread-spacing: error
  key-spacing: [warn, {afterColon: false}]
  computed-property-spacing: error
  array-bracket-spacing: [error, never]
  no-whitespace-before-property: error
  space-in-parens: error
  spaced-comment: [error, never]
  lines-between-class-members: error
  keyword-spacing: error
  array-bracket-newline: [error, consistent]
  array-element-newline: [error, consistent]

  # Coding style (function rules)
  no-new: error
  no-new-func: error
  no-new-wrappers: error
  func-names: [error, never]
  no-extra-parens: [error, functions]
  arrow-body-style: [error, as-needed]
  arrow-parens: [error, as-needed]
  implicit-arrow-linebreak: error