.eslintrc.yaml

  env:
    browser: true
    node: true
    es6: true
  extends:
    - "eslint:recommended"
    - "plugin:jest/all"
    - "standard"
  parser: "@babel/eslint-parser"
  parserOptions:
    ecmaVersion: 6
    sourceType: "module"
    ecmaFeatures:
      jsx: true
  plugins:
    - "prefer-arrow-functions"
    - "import"
    - "jest"
    - "@babel"
  rules:
    # general rules

    "no-var": "error"
    "prefer-const": "error"
    max-len:
      - "error"
      - "code": 80
      - ignoreComments: true
    "no-console":
      - "error"
    no-unused-vars:
      - "error"
      - argsIgnorePattern: "^_"
        varsIgnorePattern: "^_"
    "no-trailing-spaces": "error"
    # don't allow trailing commas in object and array literals
    "comma-dangle":
      - "error"
      - "never"
    quotes:
      - "error"
      - "double"
      - avoidEscape: true
    camelcase: "off"
    object-curly-spacing:
      - "error"
      - "never"
    "prefer-arrow-callback": "error"
    "no-else-return": "error"
    space-before-function-paren:
      - "error"
      - "never"
    "prefer-object-spread": "error"
    newline-before-return: "off"
    no-multi-str: "off"
    prefer-promise-reject-errors: "warn"
    no-unused-expressions: "off"
    "@babel/no-unused-expressions": "error"

    # if statement rules

    curly:
      - "error"
      - "multi-line"
    nonblock-statement-body-position: "off"
    brace-style:
      - "error"
      - "1tbs"
      - allowSingleLine: false

    # import rules

    "import/no-webpack-loader-syntax": "off"

    # prefer-arrow-functions

    func-style:
      - "error"
      - "declaration"
      - allowArrowFunctions: true
    "prefer-arrow-functions/prefer-arrow-functions":
      - "error"
      - classPropertiesAllowed: false
        disallowPrototype: true
        returnStyle: "implicit"

    # jest

    jest/no-hooks: "off"
    jest/prefer-lowercase-title:
      - "error"
      - ignoreTopLevelDescribe: true