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rOACCT/node_modules/core-js/internals/map-upsert.js
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map-upsert.js
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			'use strict';
			var call = require('../internals/function-call');
			var aCallable = require('../internals/a-callable');
			var isCallable = require('../internals/is-callable');
			var anObject = require('../internals/an-object');

			var $TypeError = TypeError;

			// `Map.prototype.upsert` method
			// https://github.com/tc39/proposal-upsert
			module.exports = function upsert(key, updateFn /* , insertFn */) {
			var map = anObject(this);
			var get = aCallable(map.get);
			var has = aCallable(map.has);
			var set = aCallable(map.set);
			var insertFn = arguments.length > 2 ? arguments[2] : undefined;
			var value;
			if (!isCallable(updateFn) && !isCallable(insertFn)) {
			throw $TypeError('At least one callback required');
			}
			if (call(has, map, key)) {
			value = call(get, map, key);
			if (isCallable(updateFn)) {
			value = updateFn(value);
			call(set, map, key, value);
			}
			} else if (isCallable(insertFn)) {
			value = insertFn();
			call(set, map, key, value);
			} return value;
			};