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This code snippet copies a file to another location on disk. 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 file = Bun.file('/path/to/original.txt');
await Bun.write('/path/to/copy.txt', file);
See Docs > API > File I/O for complete documentation of Bun.write().