PlainObjectSerializer.js
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PlainObjectSerializer.js
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			/*
			MIT License http://www.opensource.org/licenses/mit-license.php
			*/

			"use strict";

			const cache = new WeakMap();

			class ObjectStructure {
			constructor(keys) {
			this.keys = keys;
			this.children = new Map();
			}

			getKeys() {
			return this.keys;
			}

			key(key) {
			const child = this.children.get(key);
			if (child !== undefined) return child;
			const newChild = new ObjectStructure(this.keys.concat(key));
			this.children.set(key, newChild);
			return newChild;
			}
			}

			const getCachedKeys = (keys, cacheAssoc) => {
			let root = cache.get(cacheAssoc);
			if (root === undefined) {
			root = new ObjectStructure([]);
			cache.set(cacheAssoc, root);
			}
			let current = root;
			for (const key of keys) {
			current = current.key(key);
			}
			return current.getKeys();
			};

			class PlainObjectSerializer {
			serialize(obj, { write }) {
			const keys = Object.keys(obj);
			if (keys.length > 1) {
			write(getCachedKeys(keys, write));
			for (const key of keys) {
			write(obj[key]);
			}
			} else if (keys.length === 1) {
			const key = keys[0];
			write(key);
			write(obj[key]);
			} else {
			write(null);
			}
			}
			deserialize({ read }) {
			const keys = read();
			const obj = {};
			if (Array.isArray(keys)) {
			for (const key of keys) {
			obj[key] = read();
			}
			} else if (keys !== null) {
			obj[keys] = read();
			}
			return obj;
			}
			}

			module.exports = PlainObjectSerializer;