.eslintrc.js

module.exports = {
  root: true,
  extends: 'airbnb-base',
  plugins: ['output-todo-comments'],
  parser: 'babel-eslint',
  rules: {
    indent: ['error', 2, { SwitchCase: 1 }],
    'no-var': 'error',
    'no-console': 'error',
    'prefer-rest-params': 0, // arguments work faster
    'no-param-reassign': ['error', { props: false }],
    'no-underscore-dangle': 0, // for some hacks and array methods underscore prefix/suffix is required
    'no-use-before-define': 0, // impossible to follow
    'global-require': 0, // allow to fix circular refs
    'new-cap': ['error', { capIsNewExceptions: ['Class'] }],
    'comma-dangle': ['error', 'never'], // personal preference
    'no-continue': 0, // continue statements are useful to flatten nested blocks
    'import/no-extraneous-dependencies': 0, // that's a bad practice, but modu;es from /packages use modules from projecr_root/node_modules
    'import/no-unresolved': ['error', { ignore: ['^seemple', '^src'] }], // allow to use 'seemple/' and 'src/' as modules in tests and relative packages
    'no-cond-assign': ['error', 'except-parens'], // sometimes it's needed in while()
    'max-lines': ['error', 210], // we may want to decrease this number later
    'no-plusplus': ['error', { allowForLoopAfterthoughts: true }], // x++ is used very often in cycles
    'class-methods-use-this': 0, // it't not required to use this in class methods
    'no-bitwise': ['error', { allow: ['~'] }], // allow to use ~x.indexOf
    'no-restricted-syntax': 0, // for..of is used at tests
    'no-multi-assign': 0, // allow x = y = z
    'prefer-destructuring': 0, // allow things like x = y[z]
    'output-todo-comments/output-todo-comments': [
      'warn', {
        terms: ['todo'],
        location: 'start'
      }
    ],
    'max-classes-per-file': 0, // somt tests use more than 1 class
    'no-mixed-operators': 0 // nah
  },
  env: {
    jasmine: true
  },
  globals: {
    window: true
  }
};