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node_modules/core-js/internals/to-string.js

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+'use strict';
+var classof = require('../internals/classof');
+
+var $String = String;
+
+module.exports = function (argument) {
+  if (classof(argument) === 'Symbol') throw new TypeError('Cannot convert a Symbol value to a string');
+  return $String(argument);
+};