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
An introduction for using it can be found here.
Feedback and problem reports regarding the npm-specific pieces should be directed to the subproject's GitHub Issues. Feedback and problem reports for the non-npm-specific pieces should be directed to the SQLite forum.