clover's git

the-knife

1	import { Cache, Effect } from "effect";
2	import { detachStackFrame } from "../detachStackFrame.ts";
3	// `original` runs the bare Effect Cache to show the leak this helper prevents.
4	const original = process.argv.includes("original");
5	const failure = process.argv.includes("failure");
6	const lookup = () => (failure ? Effect.fail("unavailable") : Effect.succeed(1));
7	const cache = await Effect.runPromise(
8	Cache.makeWith(lookup, { capacity: 8, timeToLive: () => "1 hour" }),
9	);
10	const get = () => (original ? Cache.get(cache, "key") : detachStackFrame(Cache.get(cache, "key")));
11	let reference;
12	await Effect.runPromise(
13	Effect.gen(function* () {
14	const snapshot = { values: Array.from({ length: 250000 }, (_, i) => i) };
15	reference = new WeakRef(snapshot);
16	const request = Effect.fn("StackRetention.request")(function* () {
17	yield* Effect.exit(get());
18	return snapshot.values.length;
19	});
20	yield* request();
21	}),
22	);
23	for (let i = 0; i < 12; i++) {
24	await new Promise((resolve) => setImmediate(resolve));
25	global.gc();
26	}
27	const retained = reference.deref() !== undefined;
28	const cachedResult = await Effect.runPromise(
29	get().pipe(Effect.catch(() => Effect.succeed("unavailable"))),
30	);
31	process.stdout.write(JSON.stringify({ retained, cachedResult }));