.eslintrc.yml

root: true
extends:
  - eslint:recommended
  - plugin:import/errors
  - plugin:import/warnings
parser: "babel-eslint"
env:
  # Add eslint globals
  es6: true
  # Add browser globals
  browser: true
  # Webpack adds a node environment
  node: true
settings:
  import/extensions: ['.js']
rules:
  # Semantic rules
  # Forbid `var` in favour of `const` and `let`
  no-var: error
  # Prefer constants
  prefer-const: error
  # and warn about assignment to constants
  no-const-assign: error
  # Recommend a parent constructor call
  constructor-super: error
  # Disallow object attribute access before parent constructor call
  no-this-before-super: warn
  # Warn about useless constructors
  no-useless-constructor: error
  # Style rules
  # Prefer arrow functions for function() {} in callbacks
  prefer-arrow-callback: error
  # Prefer rest ...arg over arguments magic variable
  prefer-rest-params: error
  # Prefer spread operator over .apply()
  prefer-spread: error
  # Prefer string template over string concatenation
  prefer-template: error
  # Require single quotes for Javascript
  quotes: [error, single]
  # Prefer double quotes in JSX templates
  jsx-quotes: [error, prefer-double]
  # Always require a semicolon to terminate statements
  semi: [error, always]
  # Indent with two spaces
  indent: [error, 2]
  # Keep braces on same line
  brace-style: [error, 1tbs]
  # 120 chars per line
  max-len: [error, 120]
  # Whitespace style
  array-bracket-spacing: [error, never]
  space-in-parens: [error, never]
  template-curly-spacing: [error, never]
  yield-star-spacing: [error, before]
  generator-star-spacing: [error, before]
  space-infix-ops: error
  keyword-spacing: error
  arrow-spacing: [error, {before: true, after: true}]
  comma-spacing: [error, {before: false, after: true}]
  key-spacing: [error, {beforeColon: false, afterColon: true}]
  no-trailing-spaces: error
  eol-last: error