Function freshTmpDir

src/lib/bundle.ts:487–492

* Make a fresh ` /.tmp/` directory, removing any pre-existing * orphaned tmp from a prior aborted run. Using `mkdtemp` would dodge * the rm step but would make the rename target unpredictable; this * way the temp path is stable (` /.tmp`) so a SIGKILL between two * runs doesn't leave a t

(dir: string)

 * runs doesn't leave a tree of `.tmp.<rand>` directories.
 */
async function freshTmpDir(dir: string): Promise<string> {
  const tmpDir = join(dir, '.tmp');
  await rm(tmpDir, { recursive: true, force: true });
  await mkdir(tmpDir, { recursive: true });
  return tmpDir;
}

/**
 * Rename `<tmp>/<file>` → `<dir>/<file>` for every file in `files`.