The core SQLite project releases only "vanilla JS" distributions which are independent of any given developer-side toolchain. However, a community-maintained npm-based distribution of the SQLite3 WASM components can be found at @sqlite.org/sqlite-wasm.
It can be installed from a command-line shell using:
$ npm install @sqlite.org/sqlite-wasm
Feedback on the package, as well as suggestions (or patches) for improvement, are welcome via GitHub Issues.
Note that the npm module sub-project covers only the npm-specific components, so tickets about other components should not be posted there. To request support for, or report problems with, the non-npm-specific pieces, please use the SQLite forum.
Sidebar: despite being "community-maintained," it is an official sub-project of the SQLite project. It is maintained by third-party volunteers for the simple reason that none of the SQLite maintainers use npm-based tools, so cannot directly offer support for them.