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denoland-deno/tests/unit_node/_fs/_fs_watch_test.ts

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { watch } from "node:fs";
import { assertEquals } from "@std/assert/mod.ts";
function wait(time: number) {
return new Promise((resolve) => {
setTimeout(resolve, time);
});
}
Deno.test({
name: "watching a file",
async fn() {
const file = Deno.makeTempFileSync();
const result: Array<[string, string | null]> = [];
const watcher = watch(
file,
(eventType, filename) => result.push([eventType, filename]),
);
await wait(100);
Deno.writeTextFileSync(file, "something");
await wait(100);
watcher.close();
await wait(100);
assertEquals(result.length >= 1, true);
},
});