sqlite-vec statically compiled into WASM builds

You can compile your own version of SQLite's WASM build with sqlite-vec builtin. Dynamically loading SQLite extensions is not supported in the official WASM build yet, but you can statically compile extensions in. It's not well documented, but the sqlite3_wasm_extra_init option in the SQLite ext/wasm Makefile allows you to inject your own code at initialization time. See the Makefile at the room of the project for more info.

The wasm.c file here demonstrates auto-loading the sqlite-vec entrypoints at startup.