mirror of
https://github.com/codedread/bitjs
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40 lines
1.5 KiB
JavaScript
40 lines
1.5 KiB
JavaScript
/**
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* common.js
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*
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* Provides common functionality for compressing and decompressing.
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*
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* Licensed under the MIT License
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*
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* Copyright(c) 2023 Google Inc.
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*/
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// Requires the following JavaScript features: MessageChannel, MessagePort, and dynamic imports.
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/**
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* Connects a host to a compress/decompress implementation via MessagePorts. The implementation must
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* have an exported connect() function that accepts a MessagePort. If the runtime support Workers
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* (e.g. web browsers, deno), imports the implementation inside a Web Worker. Otherwise, it
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* dynamically imports the implementation inside the current JS context (node, bun).
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* @param {string} implFilename The compressor/decompressor implementation filename relative to this
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* path (e.g. './unzip.js').
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* @returns {Promise<MessagePort>} The Promise resolves to the MessagePort connected to the
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* implementation that the host should use.
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*/
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export async function getConnectedPort(implFilename) {
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const messageChannel = new MessageChannel();
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const hostPort = messageChannel.port1;
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const implPort = messageChannel.port2;
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if (typeof Worker === 'undefined') {
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const implModule = await import(`${implFilename}`);
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await implModule.connect(implPort);
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return hostPort;
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}
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return new Promise((resolve, reject) => {
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const workerScriptPath = new URL(`./webworker-wrapper.js`, import.meta.url).href;
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const worker = new Worker(workerScriptPath, { type: 'module' });
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worker.postMessage({ implSrc: implFilename }, [implPort]);
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resolve(hostPort);
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});
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}
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