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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.

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