Vite 8, is it possible to use rolldown's experimental native magic string somehow?

[LinusCenterstrom]

https://rolldown.rs/in-depth/native-magic-string

I tested it out and saw that Vite does not have a experimental.nativeMagicString field.

rolldownOptions.experimental.nativeMagicString does exist according to types but setting it doesn't seem to do anything
My config looks like follows

rolldownOptions: {
			experimental: {
				nativeMagicString: true
			},
			plugins: [
				{
					name: "test-magic-string",
					transform(code, id, meta) {
						console.log("code meta", meta);
						// meta is always { moduleType: "js", ssr: "false" } when I test
						return null;
					}
				}
			]
		}

But the meta argument never contains a magicString field.

I was unsure if I should open an issue for this since I don't know if the experimental rolldown features are supposed to be usable or not through Vite.

[manimovassagh]

The rolldownOptions.experimental.nativeMagicString setting controls whether Rolldown's internal transforms pass a native MagicString instance to its own processing pipeline — it doesn't expose MagicString objects to plugin hooks.

Looking at the Rolldown docs you linked, the native MagicString feature is about performance optimization for Rolldown's built-in transforms (like module wrapping, tree-shaking, etc.) by using a Rust-backed MagicString instead of the JS one. It's not designed to surface in the meta argument of plugin transform hooks.

The meta object in plugin hooks only contains moduleType and ssr because those are the metadata fields Vite/Rolldown exposes to plugins. The native MagicString is an internal implementation detail of the bundler, not a plugin API surface.

So to answer your question directly: no, you can't currently access Rolldown's native MagicString through Vite plugins. The experimental flag does something, but it affects internal Rolldown performance, not plugin behavior.

If you're looking to use a performant string manipulation tool in your own plugin transforms, your best bet is to use the regular magic-string npm package (which Vite itself uses internally) or look into whether Rolldown will eventually expose native string manipulation utilities as a plugin API — but that would be a separate feature request on the Rolldown repo.