Function lookupOnWindowsPath

src/workspaces/win-command.ts:76–94

(name: string, env: NodeJS.ProcessEnv)

}

function lookupOnWindowsPath(name: string, env: NodeJS.ProcessEnv): string | null {
  const exts = (env['PATHEXT'] ?? DEFAULT_PATHEXT)
    .split(';')
    .map((e) => e.trim())
    .filter(Boolean)
    .sort((a, b) => rank(a) - rank(b)); // prefer a real .exe over a .cmd shim
  // Windows env var casing is unstable across hosts; check both.
  const dirs = (env['PATH'] ?? env['Path'] ?? '').split(delimiter).filter(Boolean);
  for (const dir of dirs) {
    for (const ext of exts) {
      // PATHEXT is conventionally uppercase but npm shims are lowercase on disk.
      // Windows' filesystem is case-insensitive, so we normalize the appended
      // extension to lowercase for a clean, deterministic command string.
      const candidate = join(dir, name + ext.toLowerCase());
      if (existsSync(candidate)) return candidate;
    }
  }
  return null;
}

function rank(ext: string): number {
  const e = ext.toLowerCase();