.eslintrc.yaml

---
  env:
    browser: true
  parserOptions:
    ecmaVersion: 2017
  extends: 'eslint:recommended'
  rules:
    # Possible Errors
    no-constant-condition:
      - error
      - checkLoops: false

    # Best practices
    curly: error
    eqeqeq: error
    no-console:
      - error
      - allow:
        - assert
        - error
        - warn
    no-else-return: error
    no-extra-boolean-cast: off  # expressiveness beats it
    no-fallthrough:
      - error
      - commentPattern: 'falls?(\s|\-)?through'
    no-invalid-this: error
    no-multi-spaces: error
    no-undef: off
    no-unused-vars:
      - error
      - vars: local
        args: none

    # Stylistic
    array-bracket-spacing: error
    block-spacing: error
    brace-style:
      - error
      - 1tbs
      - allowSingleLine: true
    # camelcase: error,  # triggers on opt_foo
    comma-dangle:
      - error
      - always-multiline
    comma-spacing: error
    comma-style: error
    computed-property-spacing: error
    eol-last: error
    key-spacing: error
    keyword-spacing: error
    linebreak-style: error
    max-len: error
    new-cap:
      - error
      - capIsNew: false
    new-parens: error
    no-multiple-empty-lines: error
    no-spaced-func: error
    no-trailing-spaces: error
    no-unneeded-ternary: error
    no-whitespace-before-property: error
    object-curly-spacing: error
    object-property-newline:
      - error
      - allowMultiplePropertiesPerLine: true
    one-var-declaration-per-line: error
    operator-linebreak:
      - error
      - after
    quotes:
      - error
      - single
    semi-spacing: error
    space-before-blocks: error
    space-before-function-paren:
      - error
      - never
    space-in-parens: error
    space-infix-ops: error
    space-unary-ops: error
    # spaced-comment: error,  # triggers on fn(/*foo=*/false)

    # Ecmascript 6
    arrow-body-style:
      - error
      - as-needed
    arrow-parens:
      - error
      - as-needed
    arrow-spacing: error
    generator-star-spacing: error
    no-useless-computed-key: error
    no-useless-constructor: error
    no-var: error
    prefer-arrow-callback: error
    prefer-template: error
    rest-spread-spacing: error
    template-curly-spacing: error
    yield-star-spacing: error