ncu 18 uses Node/npm, even when installed via Bun

[GingerAdonis]

• I have searched for similar issues

Steps to Reproduce

• Install Node on Linux without npm.
• Install Bun on Linux.
• Globally install npm-check-updates via bun install -g npm-check-updates
• Run ncu -g

Current Behavior

node:events:496
      throw er; // Unhandled 'error' event
      ^

Error: spawn npm ENOENT
    at ChildProcess._handle.onexit (node:internal/child_process:285:19)
    at onErrorNT (node:internal/child_process:483:16)
    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)
Emitted 'error' event on ChildProcess instance at:
    at ChildProcess._handle.onexit (node:internal/child_process:291:12)
    at onErrorNT (node:internal/child_process:483:16)
    at process.processTicksAndRejections (node:internal/process/task_queues:90:21) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'spawn npm',
  path: 'npm',
  spawnargs: [ '--global', '--json', 'ls', '--depth=0' ]
}

Node.js v22.14.0

Expected Behavior

ncu is executed using Bun and thus recognizes it shouldn't use npm.

Workaround

Command: ncu -g --packageManager bun

[raineorshine]

Hi, thanks for reporting.

@LuisFerLCC It looks like #1514 had a regression. Could you look into this?

[LuisFerLCC]

I think I already know what the problem is. Sadly, bun doesn't have a good way to test bunx with local packages, so I'll see what I can do later today.

[LuisFerLCC]

So it was not what I expected (that bun had a userAgent check but not an execpath check). More details about the actual reason in the PR description.

#1516

[GingerAdonis]

Thank you for the quick replies and PR.