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This snippet reads a file from disk using Bun.file(). This returns a BunFile instance, which can be passed directly into the new Response constructor.
/icons/typescript.svgserver.ts
const path = '/path/to/file.txt';
const file = Bun.file(path);
const resp = new Response(file);
The Content-Type is read from the file and automatically set on the Response.
/icons/typescript.svgserver.ts
new Response(Bun.file('./package.json')).headers.get('Content-Type');
// => application/json;charset=utf-8

new Response(Bun.file('./test.txt')).headers.get('Content-Type');
// => text/plain;charset=utf-8

new Response(Bun.file('./index.tsx')).headers.get('Content-Type');
// => text/javascript;charset=utf-8

new Response(Bun.file('./img.png')).headers.get('Content-Type');
// => image/png
Putting it all together with Bun.serve().
/icons/typescript.svgserver.ts
// static file server
Bun.serve({
	async fetch(req) {
		const path = new URL(req.url).pathname;
		const file = Bun.file(path);
		return new Response(file);
	},
});
See Docs > API > File I/O for complete documentation of Bun.write().
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