.eslintrc

# https://github.com/eslint/eslint/blob/master/docs/rules/README.md

parserOptions:
  ecmaVersion: 2018

env:
  browser: true
  es6: true

globals:
  unsafeWindow: false
  GM_info: false
  GM_getValue: false
  GM_setValue: false
  GM_xmlhttpRequest: false
  GM_download: false
  GM_openInTab: false
  GM_registerMenuCommand: false
  GM_setClipboard: false

rules:
  accessor-pairs: [2]
  array-bracket-spacing: [2, never]
  array-callback-return: [0]
  arrow-body-style: [2, as-needed]
  arrow-parens: [2, as-needed]
  arrow-spacing: [2, {before: true, after: true}]
  block-scoped-var: [2]
  brace-style: [2]
  camelcase: [2, {properties: never, allow: ["^GM_\\w+"]}]
  class-methods-use-this: [2]
  comma-dangle: [2, {arrays: always-multiline, objects: always-multiline}]
  comma-spacing: [2, {before: false, after: true}]
  comma-style: [2, last]
  complexity: [0]
  computed-property-spacing: [2, never]
  consistent-return: [0]
  constructor-super: [2]
  curly: [0, multi-or-nest]
  default-case: [0]
  dot-location: [2, property]
  dot-notation: [2]
  eol-last: [2]
  eqeqeq: [2, smart]
  func-call-spacing: [2, never]
  func-name-matching: [0]
  func-names: [0]
  generator-star-spacing: [2, before]
  global-require: [0]
  guard-for-in: [0]
  handle-callback-err: [2, ^(err|error)$]
  id-blacklist: [0]
  id-length: [0]
  id-match: [0]
  indent: [2, 2, {VariableDeclarator: 1, SwitchCase: 1, MemberExpression: off}]
  jsx-quotes: [0]
  key-spacing: [2, {mode: minimum}]
  keyword-spacing: [2]
  lines-around-comment: [0]
  lines-around-directive: [0]
  max-len: [2, {
    code: 100,
    ignoreComments: true,
    ignoreRegExpLiterals: true,
    ignoreTemplateLiterals: true,
    ignorePattern: "\\burl\\(\\s*[\"']?data:"
  }]
  max-lines: [0]
  max-nested-callbacks: [0]
  max-params: [0]
  max-statements-per-line: [0]
  max-statements: [0]
  multiline-ternary: [0, always-multiline]
  new-cap: [0]
  new-parens: [2]
  newline-before-return: [0]
  newline-per-chained-call: [0]
  no-alert: [0]
  no-array-constructor: [0]
  no-bitwise: [0]
  no-caller: [2]
  no-case-declarations: [2]
  no-class-assign: [2]
  no-cond-assign: [2, except-parens]
  no-confusing-arrow: [0, {allowParens: true}]
  no-const-assign: [2]
  no-constant-condition: [0]
  no-continue: [0]
  no-control-regex: [0]
  no-debugger: [2]
  no-delete-var: [2]
  no-div-regex: [0]
  no-dupe-args: [2]
  no-dupe-class-members: [2]
  no-dupe-keys: [2]
  no-duplicate-case: [2]
  no-duplicate-imports: [2]
  no-else-return: [0]
  no-empty-character-class: [2]
  no-empty-function: [0]
  no-empty-pattern: [2]
  no-empty: [2, {allowEmptyCatch: true}]
  no-eq-null: [0]
  no-eval: [2]
  no-ex-assign: [2]
  no-extend-native: [2]
  no-extra-bind: [2]
  no-extra-boolean-cast: [2]
  no-extra-label: [0]
  no-extra-parens: [0]
  no-extra-semi: [2]
  no-fallthrough: [2, {commentPattern: fallthrough.*}]
  no-floating-decimal: [0]
  no-func-assign: [2]
  no-global-assign: [2]
  no-implicit-coercion: [0]
  no-implicit-globals: [0]
  no-implied-eval: [2]
  no-inline-comments: [0]
  no-inner-declarations: [2]
  no-invalid-regexp: [2]
  no-invalid-this: [0]
  no-irregular-whitespace: [2]
  no-iterator: [2]
  no-label-var: [2]
  no-labels: [2, {allowLoop: true}]
  no-lone-blocks: [2]
  no-lonely-if: [0]
  no-loop-func: [2]
  no-magic-numbers: [0]
  no-mixed-operators: [0]
  no-mixed-requires: [2, true]
  no-mixed-spaces-and-tabs: [2]
  no-multi-spaces: [2, {ignoreEOLComments: true}]
  no-multi-str: [2]
  no-multiple-empty-lines: [2, {max: 2, maxEOF: 0, maxBOF: 0}]
  no-native-reassign: [2]
  no-negated-condition: [0]
  no-negated-in-lhs: [2]
  no-nested-ternary: [0]
  no-new-func: [0]
  no-new-object: [2]
  no-new-require: [2]
  no-new-symbol: [2]
  no-new-wrappers: [2]
  no-new: [0]
  no-obj-calls: [2]
  no-octal-escape: [2]
  no-octal: [2]
  no-path-concat: [2]
  no-process-exit: [0]
  no-proto: [2]
  no-redeclare: [2, {builtinGlobals: false}]
  no-regex-spaces: [2]
  no-restricted-imports: [0]
  no-restricted-modules: [2, domain, freelist, smalloc, sys]
  no-restricted-syntax: [2, WithStatement]
  no-return-assign: [2, except-parens]
  no-return-await: [2]
  no-script-url: [2]
  no-self-assign: [2, {props: true}]
  no-self-compare: [2]
  no-sequences: [0]
  no-shadow-restricted-names: [2]
  no-shadow: [0]
  no-spaced-func: [2]
  no-sparse-arrays: [2]
  no-tabs: [2]
  no-template-curly-in-string: [2]
  no-this-before-super: [2]
  no-throw-literal: [0]
  no-trailing-spaces: [2]
  no-undef-init: [2]
  no-undef: [2]
  no-undefined: [0]
  no-underscore-dangle: [0]
  no-unexpected-multiline: [2]
  no-unmodified-loop-condition: [0]
  no-unneeded-ternary: [2]
  no-unreachable: [2]
  no-unsafe-finally: [2]
  no-unsafe-negation: [2]
  no-unused-expressions: [1]
  no-unused-labels: [0]
  no-unused-vars: [1, {
    args: after-used,
    vars: local,
    ignoreRestSiblings: true,
    argsIgnorePattern: ^_|^e$
  }]
  no-use-before-define: [0]
  no-useless-call: [2]
  no-useless-computed-key: [2]
  no-useless-concat: [0]
  no-useless-constructor: [2]
  no-useless-escape: [2]
  no-var: [2]
  no-warning-comments: [0]
  no-whitespace-before-property: [2]
  no-with: [2]
  nonblock-statement-body-position: [0]
  object-curly-newline: [2, {multiline: true, consistent: true}]
  object-curly-spacing: [2, never]
  object-shorthand: [0]
  one-var-declaration-per-line: [0]
  one-var: [0, {initialized: never}]
  operator-assignment: [2, always]
  operator-linebreak: [2, after, overrides: {"?": ignore, ":": ignore, "&&": ignore, "||": ignore}]
  padded-blocks: [0]
  prefer-const: [1, {destructuring: all, ignoreReadBeforeAssign: true}]
  prefer-numeric-literals: [2]
  prefer-rest-params: [0]
  quote-props: [2, consistent]
  quotes: [1, single, avoid-escape]
  radix: [2, as-needed]
  require-jsdoc: [0]
  require-yield: [2]
  semi-spacing: [2, {before: false, after: true}]
  semi: [2, always]
  sort-imports: [0]
  sort-keys: [0]
  space-before-blocks: [2, always]
  space-before-function-paren: [2, {anonymous: always, asyncArrow: always, named: never}]
  space-in-parens: [2, never]
  space-infix-ops: [2]
  space-unary-ops: [2]
  spaced-comment: [0, always, {markers: ["!"]}]
  strict: [2, global]
  symbol-description: [2]
  template-curly-spacing: [2, never]
  unicode-bom: [2, never]
  use-isnan: [2]
  valid-typeof: [2]
  wrap-iife: [2, inside]
  yield-star-spacing: [2, {before: true, after: false}]
  yoda: [2, never]