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https://github.com/vercel-labs/scriptc.git
synced 2026-11-03 07:54:40 +08:00
Chris Tate
d8f3565ac4
A write completion callback that a JavaScript module returned reaches the stream lowering as an untyped value. Since the error-argument form of write callbacks, the lowering refused it with SC2020, so tests/corpus/8532-stream-saved-callback-receiver failed to compile. Such a callback is now converted to a function of the error argument. The stream calls it unbound with null after a successful write or with the write's error, and ignores what it returns, as Node does.
29 lines
1.0 KiB
TypeScript
29 lines
1.0 KiB
TypeScript
// Write completion callbacks from a JavaScript module run unbound with
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// Node's arguments: null after a successful write, the _write error after a
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// failed one, and the write-after-end error. Their return value is ignored.
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import { Writable } from "node:stream";
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import { makeReporter } from "./report.js";
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const lines: string[] = [];
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const sink = new Writable({
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write(chunk: Buffer, _encoding: string, callback: (error?: Error | null) => void): void {
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callback(chunk.toString() === "bad" ? new Error("rejected") : null);
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},
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});
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sink.on("error", (error) => lines.push(`error event ${error.message}`));
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sink.write("good", makeReporter(lines, "good"));
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sink.write("bad", "utf8", makeReporter(lines, "bad"));
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const ended = new Writable({
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write(_chunk: Buffer, _encoding: string, callback: (error?: Error | null) => void): void {
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callback();
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},
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});
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ended.on("error", () => lines.push("ended error event"));
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ended.end();
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ended.write("late", makeReporter(lines, "late"));
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setTimeout(() => {
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for (const line of lines) console.log(line);
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}, 5);
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