package spa

import "mime"

// Go's built-in MIME table — and a container image without /etc/mime.types — has no
// entry for these extensions, so http.FileServer falls back to content sniffing and
// mislabels them. The one that matters for a PWA server is the web app manifest,
// sniffed as text/plain instead of application/manifest+json. Registering the types
// once at package load makes mime.TypeByExtension authoritative, so the correct
// Content-Type is sent and no sniffing fallback runs.
//
// This is a correctness nit, not a fix for a live break: the manifest spec parses by
// content (valid JSON) rather than declared type, so browsers accept it either way.
// A PWA-focused server should still label it correctly. .webp/.avif get the same
// treatment for the same reason.
func init() {
	for ext, typ := range map[string]string{
		".webmanifest": "application/manifest+json",
		".webp":        "image/webp",
		".avif":        "image/avif",
	} {
		_ = mime.AddExtensionType(ext, typ)
	}
}