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node_modules/core-js/internals/get-built-in.js

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+'use strict';
+var global = require('../internals/global');
+var isCallable = require('../internals/is-callable');
+
+var aFunction = function (argument) {
+  return isCallable(argument) ? argument : undefined;
+};
+
+module.exports = function (namespace, method) {
+  return arguments.length < 2 ? aFunction(global[namespace]) : global[namespace] && global[namespace][method];
+};