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Chris Tate
e334ae444e
* feat(child_process): lower UTF-8 execFile callback options * test(ts7): record execFile callback options fixture order
45 lines
2.2 KiB
TypeScript
45 lines
2.2 KiB
TypeScript
// child_process support boundaries: what stays rejected at LOWERING with
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// specific messages. The fallback declarations type the supported surface
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// exactly, so most misuse is a type error before lowering; these are the
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// forms that TYPECHECK and fence per site.
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import { execFile, fork, spawn } from "node:child_process";
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// The default and explicit "pipe" forms use piped streams.
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// Keep both adjacent to the remaining rejection cases.
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const noOpts = spawn("/bin/echo");
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// "inherit" and "ignore" remain process-only forms without child streams.
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// All four supported modes must coexist with the fences below.
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const piped = spawn("/bin/echo", [], { stdio: "pipe" });
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const inherited = spawn("/bin/echo", [], { stdio: "inherit" });
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// A variable options value must fence instead of being dropped.
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const options: { stdio: "ignore"; detached: boolean } = { stdio: "ignore", detached: true };
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spawn("true", [], options);
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spawn("printf", ["unsafe"], { stdio: "ignore", shell: true });
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const c = spawn("true", [], { stdio: "ignore" });
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// `() => 5` IS assignable to a void-returning listener slot and now ADOPTS
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// the slot's void (JS ignores the value); an ANNOTATED value-returning
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// listener keeps its word and stays fenced — the registry calls listeners
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// as void.
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c.on("exit", (): number => 5);
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// Methods have no bound-value form — call on directly.
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const f = c.on;
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// The callback slice accepts inline utf8/maxBuffer options, but not all of
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// Node's options or the optional-callback overload family.
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execFile("true");
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execFile("true", [], { cwd: "/tmp" }, () => {});
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const bufferLimit = 1024;
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execFile("true", [], { maxBuffer: bufferLimit }, () => {});
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const getEncoding = (): "utf8" => "utf8";
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execFile("true", [], { encoding: getEncoding() }, () => {});
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// Fork targets are part of the compiled graph and therefore must resolve at
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// build time. The remaining channel is JSON-only and occupies stdio slot 3.
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fork(process.argv[1]!);
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const staticWorker = new URL("./child-process.ts", import.meta.url);
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fork(staticWorker, [], { serialization: "advanced" });
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fork(staticWorker, [], { stdio: ["ignore", "ignore", "ignore", "ignore"] });
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// Keep each fence on its own statement so diagnostics remain site-specific.
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