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docs(bun): note WebSocket limitation with remote browser connections #3537

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matt-aitken merged 2 commits into from
May 8, 2026
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docs(bun): note WebSocket limitation with remote browser connections #3537

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docs(bun): note WebSocket limitation with remote browser connections
isshaddad May 8, 2026
76fc202
Merge branch 'main' into docs/bun-websocket-remote-browser-limitation
isshaddad May 8, 2026
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8 changes: 5 additions & 3 deletions docs/guides/frameworks/bun.mdx
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Expand Up @@ -10,12 +10,13 @@ import CliRunTestStep from "/snippets/step-run-test.mdx";
import CliViewRunStep from "/snippets/step-view-run.mdx";

<Warning>
The trigger.dev CLI does not yet support Bun. So you will need to run the CLI using Node.js.
Bun will still be used to execute your tasks, even in the `dev` environment.
The trigger.dev CLI does not yet support Bun. So you will need to run the CLI using Node.js. Bun
will still be used to execute your tasks, even in the `dev` environment.
</Warning>

<Note>
**Supported Bun version:** Deployed tasks run on Bun 1.3.3. For local development, use Bun 1.3.x for compatibility.
**Supported Bun version:** Deployed tasks run on Bun 1.3.3. For local development, use Bun 1.3.x
for compatibility.
</Note>

<Prerequisites framework="Bun" />
Expand All @@ -27,6 +28,7 @@ import CliViewRunStep from "/snippets/step-view-run.mdx";
```bash
mkdir -p ~/.bun/bin && ln -s $(which bun) ~/.bun/bin/bun
```
- Bun's WebSocket client does not handle the `101 Switching Protocols` upgrade response correctly, so connecting to a remote browser via `puppeteer.connect()` / `playwright.connectOverCDP()` (e.g. BrowserBase, Browserless) fails silently — typically with an empty `{}` `ErrorEvent`. The remote session opens and immediately drops. **Workaround:** set `runtime: "node"` in `trigger.config.ts` for tasks that connect to a remote browser.

## Initial setup

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