w4 watch for Rust uses debug build

[hw762]

Running w4 watch uses cargo build to rebuild, which is the debug build and generates warning about oversize. It should probably use the release build.

[majaha]

Hmm, is this really a problem? It's okay to be oversized during development.

[hw762]

I would like to keep track of the size in development. Well, I can build the release and check myself, but this can be automated.

[JerwuQu]

The w4 watch command is mostly targeted at fast development, and for development it's generally useful to have debug symbols available.
I'd suggest having a script that automatically builds in release with wasm-opt if you want to keep accurate track of the final size.
You could also override the dev/debug profile in your Cargo.toml if you always want to build an optimized binary even with cargo build (and cargo build --debug), though I wouldn't recommend it, and it isn't really useful without wasm-opt either.