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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. To read the file into a Uint8Array instance, retrieve the contents of the BunFile with .bytes(). 
const path = '/path/to/package.json';
const file = Bun.file(path);

const byteArray = await file.bytes();

byteArray[0]; // first byteArray
byteArray.length; // length of byteArray
Refer to API > Binary data > Typed arrays for more information on working with Uint8Array and other binary data formats in Bun.