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pnpm run build fails on Windows with spawnSync npm ENOENT

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
75/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
nodejs, shell, typescript
Domain
build-system, cli

Research direction

The issue is in scripts/build-coding-agent-bundle.mjs where execFileSync calls npm. On Windows, the executable is npm.cmd. Check how other scripts in the project call npm on Windows, likely using cmd.exe /c or a shell. Look at the execFileSync call and modify it to use the correct executable path or a shell. Run pnpm run build on a Windows machine or a Windows CI environment to verify the fix.

Written by the indexing model from the issue text.

Description

What happened?

pnpm run build fails on Windows while bundling @step-harness/coding-agent. TypeScript compilation and copy-assets finish, then scripts/build-coding-agent-bundle.mjs exits with spawnSync npm ENOENT.

Environment: Windows 10 (10.0.26200), Node.js v24.14.1, pnpm 9.15.9, package @step-harness/coding-agent@0.84.4 at commit 8297eb5.

node:internal/child_process:1119
    result.error = new ErrnoException(result.error, 'spawnSync ' + options.file);
                   ^

Error: spawnSync npm ENOENT
  code: 'ENOENT',
  syscall: 'spawnSync npm',
  path: 'npm',
  spawnargs: [
    '--prefix',
    'D:\\code\\git-project\\Step-Code\\apps\\cli',
    'run',
    'build'
  ]
}

The stack points at execFileSync("npm", ["--prefix", appEntryDir, "run", "build"], ...) in scripts/build-coding-agent-bundle.mjs.

Earlier npm run build steps in the same pnpm run build succeed, because pnpm launches them through cmd.exe /c. execFileSync does not use a shell and does not search PATHEXT, so it looks for a file named npm. On Windows the executable is npm.cmd.

Steps to reproduce

  1. Clone the repo on Windows and run pnpm install --ignore-scripts.
  2. Run pnpm run build from the repository root.

Expected behavior

pnpm run build completes, including the CLI compile started by the coding-agent bundle script.

Dominant language
TypeScript
Stars
54
Forks
20
Avg merge
4h 1m
Merged PRs (30d)
12

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