Peer dependencies
Style Dictionary and your bundler are peers, so you choose their versions.
The Rspack peer is
@rspack/core. The npm package named rspack is unrelated.
Node
The plugin needs Node 22.12 or newer.unplugin declares ^20.19.0 || >=22.12.0, and every Style Dictionary 5 release declares >=22.0.0. Only 22.12 and newer satisfies both.
One configuration format asks for more: a .ts configuration file needs Node 22.18 or newer, where TypeScript type stripping is on by default. Nothing warns about that when you install. See Configuration.
TypeScript
The subpath entry points need amoduleResolution of bundler, node16 or nodenext. The deprecated node10 cannot resolve them.
The package is written in TypeScript and ships its own declarations, so there is nothing else to install.
Next
Add it to your bundler
Import the entry point that matches your bundler.

