.eslintrc.yml

# vim: syntax=yaml

#
# List of very light restrictions designed to prevent obvious errors,
# not impose our own code style upon other contributors.
#
# This is supposed to be used with `eslint --reset`
#
# Created to work with eslint@0.18.0
#

extends: [
  "eslint:recommended",
  "google",
  "plugin:flowtype/recommended",
  "plugin:jest/recommended",
  "plugin:prettier/recommended"]

plugins: ["flowtype", "jest", "prettier"]

settings:
    flowtype:
      onlyFilesWithFlowAnnotation: false

parser: "babel-eslint"

env:
  node: true
  browser: true
  es6: true
  mocha: true
  jest/globals: true

parserOptions:
  sourceType: "module"
  ecmaVersion: 8
  ecmaFeatures:
    modules: true

rules:
  prettier/prettier: ["error", { "singleQuote": true }]
  strict: 0
  # useful to have in node.js,
  # if you're sure you don't need to handle error, rename it to "_err"
  handle-callback-err: 2

  padded-blocks: 0
  switch-colon-spacing: 0

  # just to make sure we don't forget to remove them when releasing
  no-debugger: 2

  # add "falls through" for those
  no-fallthrough: 2

  # enforce use curly always
  # curly: 1

  # just warnings about whitespace weirdness here
  eol-last: 1
  no-irregular-whitespace: 1
  no-mixed-spaces-and-tabs: [1, smart-tabs]
  no-trailing-spaces: 1

  # probably always an error, tell me if it's not
  no-new-require: 2

  # single most important rule here, without it linting won't even
  # make any sense
  no-undef: 2

  # in practice, those are always errors
  no-unreachable: 2

  # useful for code clean-up
  no-unused-vars: [2, {"vars": "all", "args": "none"}]

  max-len: [1, 160]

  # camelcase is standard, but this should be 1 and then 2 soon
  camelcase: 0

  # jsdoc is mandatory
  require-jsdoc: 0
  valid-jsdoc: 0

  # this feature is cool but not supported by Node 4, disable via comments
  prefer-spread: 1
  prefer-rest-params: 1

  # encorage use es6
  no-var: 2

  # configuration that should be upgraded progresivelly
  no-constant-condition: 2
  no-empty: 2

  # loop over objects http://eslint.org/docs/rules/guard-for-in
  guard-for-in: 2

  # this must be used within classes
  no-invalid-this: 2

  # All object must be uppercase
  new-cap: 2

  # readbility is important, no multiple inline declarations
  one-var: 2

  # console not allowed unless for testing
  no-console: [2, {"allow": ["log", "warn"]}]

  jest/no-focused-tests: 1