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node_modules/core-js/es/instance/flags.js

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+'use strict';
+var isPrototypeOf = require('../../internals/object-is-prototype-of');
+var flags = require('../regexp/flags');
+
+var RegExpPrototype = RegExp.prototype;
+
+module.exports = function (it) {
+  return (it === RegExpPrototype || isPrototypeOf(RegExpPrototype, it)) ? flags(it) : it.flags;
+};