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The Bun.file() function accepts a path and returns a BunFile instance. The BunFile class extends Blob, so use the .type property to read the MIME type. 
const file = Bun.file('./package.json');
file.type; // application/json

const file = Bun.file('./index.html');
file.type; // text/html

const file = Bun.file('./image.png');
file.type; // image/png
Refer to API > File I/O for more information on working with BunFile.