Add option "mimeOverride" so you can override MIME/Content-Type headers

[eirslett]

The use-case for this is bundlers like Vite, that serve compiled
TypeScript with a .ts file extension. The MIME standard has assigned
content video/mp2t to the .ts extension, but in the case of bundlers,
they would need to serve these files with "Content-Type: application/javascript".

Here is the specific use case: vitejs/vite#2642

[lukeed]

Hi, thank you, but this should be done in setHeaders as it's given all the necessary information (and window of opportunity) to make that override.

sirv('dir', {
  // ...
  setHeaders(res, pathname) {
    if (/\.[tj]sx?$/.test(pathname)) {
      res.setHeader('Content-Type', 'text/javascript');
    }
  }
})