vitest hangs

[birkskyum]

What version of Bun is running?

1.1.10-canary.1+cc0bce62e

update: 1.1.17+bb66bba1b

What platform is your computer?

Darwin 23.4.0 arm64 arm

What steps can reproduce the bug?

• bun create solid

Select template:

• with-vitest

• bun i

• bun run test (works)

• bun --bun run test (hangs)

What is the expected behavior?

Test to pass

What do you see instead?

Hangs

Additional information

@Electroid , here is a repro on hanging vitest in a new issue, as requested in:

• bunx vitest hangs #9170 (comment)

[corbinu]

@birkskyum I believe this one is working now and can be closed out

[birkskyum]

Awesome, thanks for the ping - I'll check right away.

[birkskyum]

@corbinu , I'm still seeing this with:

Bun 1.2.0
Vitest 2.1.6

What are the versions you used? Did you use the --bun flag?

[corbinu]

Bun 1.1.45
MacOS: 15.3
I will check on vitest as was some of my nuxt projects whose tests were failing before
I will check with --bun but also don't have node installed at all anymore so shouldn't be needed

[corbinu]

nvm looks like 1.2 is broken again. It doesn't hang but instead blows up on #imports.

[jprinaldi]

I can confirm the issue is present with:

Bun 1.2.0
Vitest 3.0.4

[birkskyum]

And bun 1.2.1

[xand3r40r93]

I can confirm: 1.1.45 or 1.2.1 with vitest 3.0.4

[nwidynski]

Took some time to figure out what actually breaks underneath in tinypool and created a bun patch for it.
This should fix the default forks pool on bun@1.2.2 and vitest@3.0.2. Additional pools will require more investigation.

Unfortunately this patch is reliant on a flaky timeout to make sure the dynamically loaded worker module is initialized by the time it tries to access global variables. I'm unsure how to await this state properly, maybe someone can weigh in there 👍

diff --git a/node_modules/tinypool/.bun-tag-123fa8ebee5d4e7f b/.bun-tag-123fa8ebee5d4e7f
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/node_modules/tinypool/.bun-tag-140919ad0ea92504 b/.bun-tag-140919ad0ea92504
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/node_modules/tinypool/.bun-tag-5f53ad7a20e51e57 b/.bun-tag-5f53ad7a20e51e57
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/node_modules/tinypool/.bun-tag-8915892091061a03 b/.bun-tag-8915892091061a03
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/node_modules/tinypool/.bun-tag-a6c506685e3f9d19 b/.bun-tag-a6c506685e3f9d19
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/node_modules/tinypool/.bun-tag-c4308a5e694b4f6b b/.bun-tag-c4308a5e694b4f6b
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/dist/entry/process.js b/dist/entry/process.js
index 093c18d411d2d33d46604423d82694f7ad44a935..38f3de77695c12a7e14630e43f29a3840a1fa518 100644
--- a/dist/entry/process.js
+++ b/dist/entry/process.js
@@ -52,6 +52,7 @@ async function onMessage(message) {
     if (handler === null) {
       throw new Error(`No handler function exported from ${filename}`);
     }
+    if("bun" in process.versions) await new Promise(resolve => setTimeout(resolve, 20));
     const result = await handler(task);
     response = {
       source: "port",
diff --git a/dist/index.js b/dist/index.js
index deb2db9c2eed6e4331b9af0402dfcad97196397a..db95357ed271acfb9daa5a02ceaa399e81ef0ff2 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -192,14 +192,22 @@ var ProcessWorker = class {
       }
     });
     if (this.port) {
-      this.port.on(
-        "message",
-        (message2) => this.send({
-          ...message2,
+      if("bun" in process.versions) {
+        this.port.onmessage = (message2) => this.send({
+          ...message2.data,
           source: "port",
           __tinypool_worker_message__
-        })
-      );
+        });
+      } else {
+        this.port.on(
+          "message",
+          (message2) => this.send({
+            ...message2,
+            source: "port",
+            __tinypool_worker_message__
+          })
+        );
+      }
     }
     return this.send({
       ...message,
@@ -509,10 +517,15 @@ var WorkerInfo = class extends AsynchronouslyCreatedResource {
     this.workerId = workerId;
     this.freeWorkerId = freeWorkerId;
     this.port = port;
-    this.port.on(
-      "message",
-      (message) => this._handleResponse(message)
-    );
+
+    if("bun" in process.versions) {
+      this.port.onmessage = (message) => this._handleResponse(message.data)
+    } else {
+      this.port.on(
+        "message",
+        (message) => this._handleResponse(message)
+      );
+    }
     this.onMessage = onMessage;
     this.taskInfos = /* @__PURE__ */ new Map();
     this.sharedBuffer = new Int32Array(