要将 ReadableStream 写入磁盘，首先从流创建一个 Response 实例。然后可以使用 Bun.write() 将此 Response 写入磁盘。

const stream: ReadableStream = ...;
const path = "./file.txt";
const response = new Response(stream);

await Bun.write(path, response);

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请参阅 文档 > API > File I/O 获取 Bun.write() 的完整文档。