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The Bun.file() function accepts a path and returns a BunFile instance. The BunFile class extends Blob and allows you to lazily read the file in a variety of formats. Use .stream() to consume the file incrementally as a ReadableStream. 
const path = '/path/to/package.json';
const file = Bun.file(path);

const stream = file.stream();
The chunks of the stream can be consumed as an async iterable using for await. 
for await (const chunk of stream) {
	chunk; // => Uint8Array
}
Refer to the Streams documentation for more information on working with streams in Bun.