Function check

pub fn check(
    dir: PathBuf,
    check_opts: &CheckOpts,
    tools: &Tools,
    global_opts: &Opts,
) -> Result<i32, ExecutionError>

Checks the user’s app by checking their code and building it. This will first run cargo check, and then cargo check --target wasm32-unknown-unknown, so we can error quickly on compilation errors. If those both succeed, then we’ll actually try to generate build artifacts, which is the only other place a Perseus can reasonably fail at build-time.