Implement `napi_ref_threadsafe_function` (#4156)

* Implement napi_ref_threadsafe_function

* work on this

* i hate event loops

* little better

* clean

5 files changed, 37 insertions, 0 deletions

diff --git a/test/bun.lockb b/test/bun.lockb
index 98c35844d..c94d5aff3 100755
--- a/test/bun.lockb
+++ b/test/bun.lockb
diff --git a/test/js/third_party/fsevents/fsevents-event-loop.mjs b/test/js/third_party/fsevents/fsevents-event-loop.mjs
new file mode 100644
index 000000000..80e4729a1
--- /dev/null
+++ b/test/js/third_party/fsevents/fsevents-event-loop.mjs
@@ -0,0 +1,10 @@
+import fsevents from "fsevents";
+
+if (process.argv.length < 3) {
+  console.log("Usage: bun fsevents-event-loop.ts <directory>");
+  process.exit(1);
+}
+fsevents.watch(process.argv[2], () => {
+  console.log("it works!");
+  process.exit(0);
+});
diff --git a/test/js/third_party/fsevents/fsevents.test.ts b/test/js/third_party/fsevents/fsevents.test.ts
new file mode 100644
index 000000000..1381347e9
--- /dev/null
+++ b/test/js/third_party/fsevents/fsevents.test.ts
@@ -0,0 +1,20 @@
+import { bunEnv, bunExe } from "harness";
+import path from "path";
+import fs from "fs";
+import os from "os";
+
+test("fsevents works (napi_ref_threadsafe_function keeps event loop alive)", async () => {
+  const tempFile = fs.mkdtempSync(path.join(os.tmpdir(), "fsevents-test-"));
+  const spawned = Bun.spawn({
+    cmd: [bunExe(), "run", path.join(import.meta.dir, "fsevents-event-loop.mjs"), tempFile],
+    env: bunEnv,
+    stdio: ["pipe", "pipe", "pipe"],
+  });
+  await Bun.sleep(50);
+  if (spawned.killed) {
+    throw new Error("event loop died, test failed");
+  }
+  await Bun.write(tempFile + "/hello.txt", "test");
+  expect(await spawned.exited).toBe(0);
+  expect(await new Response(spawned.stdout).text()).toBe("it works!\n");
+});
diff --git a/test/js/third_party/fsevents/package.json b/test/js/third_party/fsevents/package.json
new file mode 100644
index 000000000..315c73e1a
--- /dev/null
+++ b/test/js/third_party/fsevents/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "fsevents-test",
+  "dependencies": {
+    "fsevents": "2.3.2"
+  }
+}
diff --git a/test/package.json b/test/package.json
index f841d2003..099f3d312 100644
--- a/test/package.json
+++ b/test/package.json
@@ -17,6 +17,7 @@
     "es-module-lexer": "1.3.0",
     "esbuild": "0.18.6",
     "express": "4.18.2",
+    "fsevents": "2.3.2",
     "iconv-lite": "0.6.3",
     "jest-extended": "4.0.0",
     "lodash": "4.17.21",