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rOACCT/node_modules/core-js/modules/esnext.weak-map.emplace.js
dd570dbc4621master

esnext.weak-map.emplace.js
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			'use strict';
			var $ = require('../internals/export');
			var aWeakMap = require('../internals/a-weak-map');
			var WeakMapHelpers = require('../internals/weak-map-helpers');

			var get = WeakMapHelpers.get;
			var has = WeakMapHelpers.has;
			var set = WeakMapHelpers.set;

			// `WeakMap.prototype.emplace` method
			// https://github.com/tc39/proposal-upsert
			$({ target: 'WeakMap', proto: true, real: true, forced: true }, {
			emplace: function emplace(key, handler) {
			var map = aWeakMap(this);
			var value, inserted;
			if (has(map, key)) {
			value = get(map, key);
			if ('update' in handler) {
			value = handler.update(value, key, map);
			set(map, key, value);
			} return value;
			}
			inserted = handler.insert(key, map);
			set(map, key, inserted);
			return inserted;
			}
			});