/bun:debug

Launch a script with Bun's debugger enabled for interactive debugging.

When to Use This Skill

Use this skill when...	Use typescript-debugging instead when...
Attaching an interactive debugger to a Bun script via `--inspect`	Diagnosing TypeScript compile errors or type mismatches
Breaking at the first line of a fast-exiting script (`--inspect-brk`)	Setting up VSCode launch configurations for non-Bun runtimes
Debugging Bun tests with `bun --inspect-brk test`	Use bun-test when you just want to run tests, not step through them
Waiting for a debugger to attach before execution	Use bun-build when reproducing a build-time error

Parameters

file (required): Script file to debug
--brk: Break at first line (for fast-exiting scripts)
--wait: Wait for debugger to attach before running
--port=<port>: Use specific port (default: auto-assigned)

Execution

Standard debug (opens debug URL):

bun --inspect $FILE

Break at first line:

bun --inspect-brk $FILE

Wait for debugger attachment:

bun --inspect-wait $FILE

Custom port:

bun --inspect=$PORT $FILE

Debug tests:

bun --inspect-brk test $PATTERN

Output

The command outputs a debug URL:

------------------- Bun Inspector -------------------
Listening: ws://localhost:6499/
Open: debug.bun.sh/#localhost:6499
-----------------------------------------------------

Post-launch

Report the debug URL to user
Explain how to connect:
- Open debug.bun.sh/#localhost:<port> in browser
- Or use VSCode with Bun extension attached to the WebSocket URL
Remind about breakpoint controls (F8 continue, F10 step over, F11 step into)

VSCode Integration

For VSCode debugging, suggest adding to .vscode/launch.json:

{
  "type": "bun",
  "request": "launch",
  "name": "Debug",
  "program": "${file}",
  "stopOnEntry": true
}

bun-debug