My 2 dependency derivations look something like this at the moment:

        cargoArtifacts = craneLib.buildDepsOnly commonArgs;
        
        cargoWasmArtifacts = craneLib.buildDepsOnly (commonArgs // { 
          # wasm-streams wants lld
          buildInputs = [ pkgs.lld ];
          cargoExtraArgs = "--target=wasm32-unknown-unknown --no-default-features --features hydrate ";
          # Additional environment variables can be set directly
          CARGO_PROFILE = "wasm-release";
          CARGO_TARGET_DIR = "target/front";
        });