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node_modules/core-js/modules/es.array.join.js

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+'use strict';
+var $ = require('../internals/export');
+var uncurryThis = require('../internals/function-uncurry-this');
+var IndexedObject = require('../internals/indexed-object');
+var toIndexedObject = require('../internals/to-indexed-object');
+var arrayMethodIsStrict = require('../internals/array-method-is-strict');
+
+var nativeJoin = uncurryThis([].join);
+
+var ES3_STRINGS = IndexedObject !== Object;
+var FORCED = ES3_STRINGS || !arrayMethodIsStrict('join', ',');
+
+// `Array.prototype.join` method
+// https://tc39.es/ecma262/#sec-array.prototype.join
+$({ target: 'Array', proto: true, forced: FORCED }, {
+  join: function join(separator) {
+    return nativeJoin(toIndexedObject(this), separator === undefined ? ',' : separator);
+  }
+});