Option to enforce case sensitivity

[benmccann]

This request is the opposite of #92 and much easier to implement than that one

I'd like an option to only serve a file if the case matches what's on the filesystem. That's how it works on Linux, but Mac and Windows have a different behavior. It'd be nice to have the ability to enforce a consistent behavior.

SvelteKit has this implementation:

/**
 * Determine if a file is being requested with the correct case,
 * to ensure consistent behaviour between dev and prod and across
 * operating systems. Note that we can't use realpath here,
 * because we don't want to follow symlinks
 * @param {string} file
 * @param {string} assets
 * @returns {boolean}
 */
function has_correct_case(file, assets) {
	if (file === assets) return true;

	const parent = path.dirname(file);

	if (fs.readdirSync(parent).includes(path.basename(file))) {
		return has_correct_case(parent, assets);
	}

	return false;
}

However, I'd like it to live in sirv so that we can use it in Vite as well

[lukeed]

From discord:

Case sensitivity is platform specific. Fucking with it one way or another is a mistake