# Configures JS linting
# https://eslint.org/

# Add third-party configs
extends:
- eslint:recommended
- plugin:import/errors
- plugin:import/warnings

# Add third-party plugins
plugins:
  - import
  - compat

# Set target environment
env:
  browser: true

# Add support for babel (ES6)
parser: babel-eslint

rules:
  # Best Practices
  # https://github.com/eslint/eslint/tree/master/docs/rules#best-practices
  no-fallthrough: 2
  no-redeclare: 2
  
  # Browser compatibility
  compat/compat: error
  
  # Webpack import support
  import/default: 0

  # Stylistic Issues
  # https://github.com/eslint/eslint/tree/master/docs/rules#stylistic-issues
  comma-spacing: 2
  eol-last: 2
  eqeqeq: ["error", "smart"]
  indent: [2, 2, {SwitchCase: 1}]
  keyword-spacing: 2
  max-len: [1, 160, 2]
  new-parens: 2
  no-mixed-spaces-and-tabs: 2
  no-multiple-empty-lines: [2, {max: 2}]
  no-trailing-spaces: 2
  object-curly-spacing: [2, "never"]
  quotes: [2, "double", "avoid-escape"]
  semi: never
  space-before-blocks: [2, "always"]
  space-before-function-paren: [2, "never"]
  space-in-parens: [2, "never"]
  space-infix-ops: 2
  space-unary-ops: 2

  # ECMAScript 6
  # http://eslint.org/docs/rules/#ecmascript-6
  arrow-parens: [2, "always"]
  arrow-spacing: [2, {"before": true, "after": true}]
  no-confusing-arrow: 2
  prefer-const: 2

  # Strict Mode
  # https://github.com/eslint/eslint/tree/master/docs/rules#strict-mode
  strict: [2, "global"]

  # Variables
  # https://github.com/eslint/eslint/tree/master/docs/rules#variables
  no-undef: 2
  no-unused-vars: [2, {"args": "none"}]

  # Browser compatibility
  compat/compat: error

# Global scoped method and vars
globals:
  __dirname: true
  require: true
  process: true
  ENV: true
  module: true