Remove use of deprecated require.extensions

[benmccann]

require.extensions has been deprecated since 0.10.6: https://nodejs.org/api/modules.html#modules_require_extensions

uvu/examples/svelte/tests/setup/register.js

Line 22 in 30c10e0

const loadJS = require.extensions['.js'];

[lukeed]

This is intentional. May be deprecated, but it's how every require hook operates.

[benmccann]

@Rich-Harris just suggested in sveltejs/svelte#5770 (comment) that ESM with loader hooks would be a preferable alternative

[lukeed]

I can add a separate demonstration for --loader, but it only "replaces" require.extensions as much ESM replaces CommonJS. It still needs to be an explicit opt-in.