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rOACCT/node_modules/core-js/internals/add-to-unscopables.js
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add-to-unscopables.js
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			var wellKnownSymbol = require('../internals/well-known-symbol');
			var create = require('../internals/object-create');
			var defineProperty = require('../internals/object-define-property').f;

			var UNSCOPABLES = wellKnownSymbol('unscopables');
			var ArrayPrototype = Array.prototype;

			// Array.prototype[@@unscopables]
			// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
			if (ArrayPrototype[UNSCOPABLES] == undefined) {
			defineProperty(ArrayPrototype, UNSCOPABLES, {
			configurable: true,
			value: create(null)
			});
			}

			// add a key to Array.prototype[@@unscopables]
			module.exports = function (key) {
			ArrayPrototype[UNSCOPABLES][key] = true;
			};