class State { constructor() { this.states = new Map(); } get(key) { if (!this.states.has(key)) { return null; } return this.states.get(key); } set(key, value) { return this.states.set(key, value); } serialize() { const entries = this.states.entries(); const entrymap = []; for (let state of entries) { entrymap.push(state); } return entrymap; } deserialize(data) { this.states = new Map(data); } } export default new State();