.eslintrc.js

// use double quotes in json!
// 1=warn, 2=error
const path = require('path')

const typescriptConfig = require(path.join(__dirname, '.eslintrc.typescript.js'))

module.exports = {
	root: true,
	parser: 'babel-eslint',
	parserOptions: {
		ecmaVersion: 6,
		sourceType: 'module',
	},
	plugins: ['jest'],
	env: {
		browser: true,
		node: true,
		commonjs: true,
		es6: true,
		'jest/globals': true,
		jest: true,
	},
	globals: {
		__DEV__: true,
	},
	extends: ['airbnb-base'],
	overrides: [typescriptConfig],
	rules: {
		// Disable Eslint rules that conflict to Prettier
		semi: 'off',
		'max-len': 'off',
		'no-tabs': 'off',
		'comma-dangle': 'off',
		indent: 'off',

		'no-unused-vars': [2, { args: 'none' }],
		'dot-notation': [0], // must do because of immutable migration
		'space-before-function-paren': [0],
		'no-underscore-dangle': [0], // _ before action name in actions.js
		'no-param-reassign': [0], // eg. function(a) { a = 12 }
		'global-require': [0], // eg. Unexpected require() in src/modules/th.js
		'no-confusing-arrow': [0],
		'no-shadow': [0],
		'consistent-return': [0], // must return at the end of arrow function
		'prefer-destructuring': [0],
		'no-use-before-define': [0], // define function after function that use it
		'no-return-assign': [0], // Arrow function should not return assignment eg. cant do this -> ref={el => (this.picture = el)}
		'no-console': [2], // use wongnai/js/log instead
		'object-shorthand': [0], // Expected method shorthand
		'func-names': [0], // functions must have a name
		'no-restricted-properties': [1], // Math.pow -> exponentiation operator (**) instead
		'no-plusplus': [0], // eg. i++ or i--
		'no-mixed-operators': [0], // eg. ( a + b / c)
		'class-methods-use-this': [0], // Expected 'this' to be used by class method 'selector'
		'default-case': [0], // switch must have default case
		'no-lone-blocks': [0], // Block is redundant eg. { } in switch case
		'no-unused-expressions': [0],
		'no-restricted-globals': [0],
		'no-restricted-syntax': [0],
		'function-paren-newline': [0], // Unexpected newline after '(' or before ')' of function -> maybe conflict with prettier
		'arrow-parens': [2, 'as-needed'],
		'one-var': [0], // Split 'const' declarations into multiple statements
		'prefer-promise-reject-errors': [0], // Expected the Promise rejection reason to be an Error eg. in ApiManager.js
		'no-sequences': [0],
		'no-nested-ternary': [0], // Nesting ternary expressions can make code more difficult to understand
		'array-callback-return': [0], // enforces usage of return statement in callbacks of array’s methods.
		'no-empty-function': [0],
		'no-continue': [0], // no continue in if
		'guard-for-in': [0], // need Object.prototype.hasOwnProperty.call() in for in of obj
		'no-new': [0],
		'no-buffer-constructor': [0], // Use the producer methods Buffer.from, Buffer.alloc, and Buffer.allocUnsafe instead
		'no-proto': [0], // no __proto__ -> Use getPrototypeOf method instead
		'no-new-func': [0], // no new Function()
		'operator-assignment': [0], // Assignment can be replaced with operator assignment & failed after git commit
		'object-curly-newline': [0], // can fix with --fix but faild after git push
		'quote-props': [0], // can fix with --fix but conflict with flow "on-string literal property keys not supported"
		'no-alert': [0], // allow alert(), confirm(), prompt()
		'no-mixed-spaces-and-tabs': [0],
		'wrap-iife': [0],
		'semi-style': [0],
		'no-extra-semi': [0],
		'generator-star-spacing': [0],

		// import
		'import/no-extraneous-dependencies': [0], // Forbid the import of external modules that are not declared in the package.json's dependencies, devDependencies, optionalDependencies or peerDependencies.
		'import/first': [0], // imports that come after non-import statements.
		'import/no-unresolved': [0],
		'import/extensions': [0],
		'import/prefer-default-export': [0],
		'import/no-mutable-exports': [0], // Forbids the use of mutable exports with var or let
		'import/no-dynamic-require': [0],

		// test
		'jest/no-disabled-tests': 'warn',
		'jest/no-focused-tests': 'error',
		'jest/no-identical-title': 'error',
		'jest/prefer-to-have-length': 'warn',
		'jest/valid-expect': 'error',

		// bug
		'template-curly-spacing': [0],
	},
}