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Node + tsx Crash

Node + tsx “__name is not a function” crash

Section titled “Node + tsx “__name is not a function” crash”

Summary

Section titled “Summary”

Running CoderClaw via Node with tsx fails at startup with:

[coderclaw] Failed to start CLI: TypeError: __name is not a function
    at createSubsystemLogger (.../src/logging/subsystem.ts:203:25)
    at .../src/agents/auth-profiles/constants.ts:25:20

This began after switching dev scripts from Bun to tsx (commit 2871657e, 2026-01-06). The same runtime path worked with Bun.

Environment

Section titled “Environment”
  • Node: v25.x (observed on v25.3.0)
  • tsx: 4.21.0
  • OS: macOS (repro also likely on other platforms that run Node 25)

Repro (Node-only)

Section titled “Repro (Node-only)”
Terminal window
# in repo root
node --version
pnpm install
node --import tsx src/entry.ts status

Minimal repro in repo

Section titled “Minimal repro in repo”
Terminal window
node --import tsx scripts/repro/tsx-name-repro.ts

Node version check

Section titled “Node version check”
  • Node 25.3.0: fails
  • Node 22.22.0 (Homebrew node@22): fails
  • Node 24: not installed here yet; needs verification

Notes / hypothesis

Section titled “Notes / hypothesis”
  • tsx uses esbuild to transform TS/ESM. esbuild’s keepNames emits a __name helper and wraps function definitions with __name(...).
  • The crash indicates __name exists but is not a function at runtime, which implies the helper is missing or overwritten for this module in the Node 25 loader path.
  • Similar __name helper issues have been reported in other esbuild consumers when the helper is missing or rewritten.

Regression history

Section titled “Regression history”
  • 2871657e (2026-01-06): scripts changed from Bun to tsx to make Bun optional.
  • Before that (Bun path), coderclaw status and gateway:watch worked.

Workarounds

Section titled “Workarounds”

  • Use Bun for dev scripts (current temporary revert).

  • Use Node + tsc watch, then run compiled output:

    Terminal window
    pnpm exec tsc --watch --preserveWatchOutput
    node --watch coderclaw.mjs status

  • Confirmed locally: pnpm exec tsc -p tsconfig.json + node coderclaw.mjs status works on Node 25.

  • Disable esbuild keepNames in the TS loader if possible (prevents __name helper insertion); tsx does not currently expose this.

  • Test Node LTS (22/24) with tsx to see if the issue is Node 25–specific.

References

Section titled “References”

Next steps

Section titled “Next steps”
  • Repro on Node 22/24 to confirm Node 25 regression.
  • Test tsx nightly or pin to earlier version if a known regression exists.
  • If reproduces on Node LTS, file a minimal repro upstream with the __name stack trace.