chore: Reuse workspace target directory in wasm build script (#2312)

Author: TomAFrench

crates/wasm/build.sh

@@ -30,7 +30,7 @@ require_command wasm-opt
 
 self_path=$(dirname "$(readlink -f "$0")")
 export pname=$(toml2json < ${self_path}/Cargo.toml | jq -r .package.name)
-export CARGO_TARGET_DIR=$self_path/target
+export CARGO_TARGET_DIR=$self_path/../../target
 
 rm -rf $self_path/outputs >/dev/null 2>&1
 rm -rf $self_path/result >/dev/null 2>&1

crates/wasm/buildPhaseCargoCommand.sh

@@ -25,7 +25,7 @@ fi
 
 # TODO: Handle the wasm target being built in release mode
 TARGET=wasm32-unknown-unknown
-WASM_BINARY=${self_path}/../../target/${TARGET}/release/${pname}.wasm
+WASM_BINARY=${CARGO_TARGET_DIR}/${TARGET}/release/${pname}.wasm
 
 NODE_DIR=${self_path}/pkg/nodejs/
 BROWSER_DIR=${self_path}/pkg/web/

flake.nix

@@ -88,7 +88,7 @@
         BARRETENBERG_BIN_DIR = "${pkgs.barretenberg-wasm}/bin";
       };
 
-      testEnvironment = sharedEnvironment // {};
+      testEnvironment = sharedEnvironment // { };
 
       # The `self.rev` property is only available when the working tree is not dirty
       GIT_COMMIT = if (self ? rev) then self.rev else "unknown";
@@ -295,6 +295,7 @@
         COMMIT_SHORT = builtins.substring 0 7 GIT_COMMIT;
         VERSION_APPENDIX = if GIT_DIRTY == "true" then "-dirty" else "";
         PKG_PATH = "./pkg";
+        CARGO_TARGET_DIR = "./target";
 
         nativeBuildInputs = with pkgs; [
           which