node_modules/resolve/lib/is-core.js - devtools/devtools-frontend - Git at Google

 var isCoreModule = require('is-core-module');

 module.exports = function isCore(x) {
     return isCoreModule(x);
 };
	var isCoreModule = require('is-core-module');

	module.exports = function isCore(x) {
	return isCoreModule(x);
	};