PM2 6: `pm2 start app.ts` fails with `Interpreter bun is NOT AVAILABLE in PATH` — set `interpreter: "node"`
PM2 6 picks bun as the interpreter for .ts scripts. Without bun installed, the app never starts, even though Node 24 runs .ts files natively.
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Symptom
[PM2][ERROR] Interpreter bun is NOT AVAILABLE in PATH. (type 'which bun' to double check.)
The app does not appear in pm2 jlist at all.
What happens (reproduced)
pm2 start app.ts→ the error above; nothing starts.pm2 start app.ts --interpreter node→ online, and the process reportsnode v24.19.0.
Fix
In the ecosystem file:
{ name: "app", script: "src/server.ts", interpreter: "node" }
Bun was not installed on the box where this was observed. Where it is, the same default would run your TypeScript on bun rather than node, so check pm2 jlist → pm2_env.exec_interpreter.
Conditions
- pm2
- 6.0.14
- node
- 24.19.0
- os
- Ubuntu 24.04
- observed
- 2026-10-01
Sources
- PM2 ecosystem file — Application declaration: script, interpreter, exec_mode, instances, node_args.