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https://github.com/vercel-labs/scriptc.git
synced 2026-11-01 07:33:12 +08:00
Chris Tate
9ca9c7af9d
In JavaScript sources, ReadableStream, ReadableStreamDefaultReader, ReadableStreamDefaultController, CountQueuingStrategy and ByteLengthQueuingStrategy (globals and node:stream/web exports) are class values over a new runtime unit, scr_webstreams.c, which follows Node 24's webstreams step by step: underlying sources, queuing strategies, default readers, tee, ReadableStream.from and async iteration settle their promises in Node's order. scr_dyn_handle_class.c gives a dyn handle tag a constructor value with a prototype, brand checks and Node's constructor errors. Stream state carries cycle headers, so the collector reclaims streams whose callbacks close over their controllers. Promise steps run as native promise reactions, a variant of scr_async.c that only programs with web streams link; every other program links the default object. TypeScript sources keep their static web stream lowerings. Byte streams, BYOB readers, pipeTo and pipeThrough throw SC2020. node24-web-stream-readers and node24-web-stream-readable-lifecycle now match Node.
15 lines
448 B
JavaScript
15 lines
448 B
JavaScript
// A stream's start step runs during construction and its first pull as a
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// promise job after the script, in a program with no other asynchronous
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// work.
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const stream = new ReadableStream({
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start() {
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console.log("start");
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},
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pull(controller) {
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console.log("pull", controller.desiredSize, stream.locked);
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controller.enqueue("chunk");
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console.log("queued", controller.desiredSize);
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},
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});
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console.log("end", stream.locked);
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