Sync alternative to `fs.openAsBlob`

What is the problem this feature will solve?

I'm making a cross-runtime file streaming library (that needs to be fast) and this would make it way easier to do so since Bun.file() is already sync.

So the code might look like this if my suggestion made it to node:fs:

const getFile: (path: string) => File = globalThis.Bun
  ? Bun.file
  : process.getBuiltinModule('fs').openAsWebFile;

// Usage
return new Response(getFile('./index.html'));
return new Response(getFile('./binary-data').slice(0, 100));

What is the feature you are proposing to solve the problem?

A new API, something like fs.openAsWebFile() that returns a File maybe?
It would have more info for the Response constructor to pick up as well.

What alternatives have you considered?

fs.createReadStream but that is also async and can be slower too.

首先检查现有的 fs.openAsBlob 和 fs.createReadStream API 及其文档。在提出入口点之前，明确同步 File API 的形态、向 Response 暴露的元数据以及跨运行时行为。API 设计达成一致，并且其行为由测试和文档覆盖，即视为完成。