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This code snippet writes a Blob to disk at a particular path. It uses the fast Bun.write() API to efficiently write data to disk. The first argument is a destination, like an absolute path or BunFile instance. The second argument is the data to write. 
const path = '/path/to/file.txt';
await Bun.write(path, 'Lorem ipsum');
The BunFile class extends Blob, so you can pass a BunFile directly into Bun.write() as well. 
const path = './out.txt';
const data = Bun.file('./in.txt');

// write the contents of ./in.txt to ./out.txt
await Bun.write(path, data);
See Docs > API > File I/O for complete documentation of Bun.write().