Method #serialize

packages/computer/src/workspace.ts:721–740

(
    id: string | undefined,
    fn: (resolvedId: string | undefined) => Promise<T>,
  )

  // the queue — the caller still sees the original rejection
  // through the returned promise.
  #serialize<T>(
    id: string | undefined,
    fn: (resolvedId: string | undefined) => Promise<T>,
  ): Promise<T> {
    const resolved = this.#resolveBackendId(id);
    const slot = resolved ?? "";
    const tail = this.#mutationTails.get(slot) ?? Promise.resolve();
    const run = tail.then(
      () => fn(resolved),
      () => fn(resolved),
    );
    this.#mutationTails.set(
      slot,
      run.then(
        () => undefined,
        () => undefined,
      ),
    );
    return run;
  }

  // Resolve an exec / push / pull caller's id argument to a
  // concrete backend id. Returns undefined for a filesystem-only