1// Copyright 2022 The Pigweed Authors 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); you may not 4// use this file except in compliance with the License. You may obtain a copy of 5// the License at 6// 7// https://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12// License for the specific language governing permissions and limitations under 13// the License. 14 15import { Device } from 'pigweedjs'; 16import { createDefaultProtoCollection } from './protos'; 17 18/** 19 * Returns an instance of Device, ensures there is only one Device in 20 * current session. 21 * 22 * We do this to avoid multiple clients listening on single serial port. 23 */ 24export default async function SingletonDevice(): Promise<Device> { 25 if ((window as any).device === undefined) { 26 const protoCollection = await createDefaultProtoCollection(); 27 (window as any).device = new Device(protoCollection); 28 } 29 return (window as any).device; 30} 31