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To write a ReadableStream to disk, first create a Response instance from the stream. This Response can then be written to disk using Bun.write(). 
const stream: ReadableStream = ...;
const path = "./file.txt";
const response = new Response(stream);

await Bun.write(path, response);
See Docs > API > File I/O for complete documentation of Bun.write().
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