only-changed-jest-watch-plugin/example/node_modules/is-builtin-module/index.js

Jest watch plugin for running either only the modified test (for TDD), or tests of dependant modules

'use strict';
var builtinModules = require('builtin-modules');

module.exports = function (str) {
	if (typeof str !== 'string') {
		throw new TypeError('Expected a string');
	}

	return builtinModules.indexOf(str) !== -1;
};