src/third_party/devtools/node_modules/core-js/internals/native-weak-map.js

var global = require('../internals/global');
var nativeFunctionToString = require('../internals/function-to-string');

var WeakMap = global.WeakMap;

module.exports = typeof WeakMap === 'function' && /native code/.test(nativeFunctionToString.call(WeakMap));