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node_modules/core-js/internals/a-callable.js

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+'use strict';
+var isCallable = require('../internals/is-callable');
+var tryToString = require('../internals/try-to-string');
+
+var $TypeError = TypeError;
+
+// `Assert: IsCallable(argument) is true`
+module.exports = function (argument) {
+  if (isCallable(argument)) return argument;
+  throw new $TypeError(tryToString(argument) + ' is not a function');
+};