diff --git a/crates/wasm/build.sh b/crates/wasm/build.sh
index 900c1868c08..22814b74936 100755
--- a/crates/wasm/build.sh
+++ b/crates/wasm/build.sh
@@ -6,6 +6,21 @@ function require_command {
         exit 1
     fi
 }
+function check_installed {
+  if ! command -v "$1" >/dev/null 2>&1; then
+    echo "$1 is not installed. Please install it." >&2
+    return 1
+  fi
+  return 0
+}
+function run_or_fail {
+  "$@"
+  local status=$?
+  if [ $status -ne 0 ]; then
+    echo "Command '$*' failed with exit code $status" >&2
+    exit $status
+  fi
+}
 
 require_command toml2json
 require_command jq
@@ -13,10 +28,21 @@ require_command cargo
 require_command wasm-bindgen
 require_command wasm-opt
 
-export pname=$(toml2json < Cargo.toml | jq -r .package.name)
+self_path=$(dirname "$(readlink -f "$0")")
+export pname=$(toml2json < ${self_path}/Cargo.toml | jq -r .package.name)
+export CARGO_TARGET_DIR=$self_path/target
+
+rm -rf $self_path/outputs >/dev/null 2>&1
+rm -rf $self_path/result >/dev/null 2>&1
+
+if [ -v out ]; then
+  echo "Will install package to $out (defined outside installPhase.sh script)"
+else
+  out="$self_path/outputs/out"
+  echo "Will install package to $out"
+fi
 
-./preBuild.sh
-cargo build --lib --release --package noir_wasm --target wasm32-unknown-unknown
-./postBuild.sh
-./installPhase.sh
+run_or_fail ${self_path}/buildPhaseCargoCommand.sh
+run_or_fail ${self_path}/installPhase.sh
 
+ln -s $out $self_path/result
diff --git a/crates/wasm/buildPhaseCargoCommand.sh b/crates/wasm/buildPhaseCargoCommand.sh
new file mode 100755
index 00000000000..5fff9eff808
--- /dev/null
+++ b/crates/wasm/buildPhaseCargoCommand.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+function run_or_fail {
+  "$@"
+  local status=$?
+  if [ $status -ne 0 ]; then
+    echo "Command '$*' failed with exit code $status" >&2
+    exit $status
+  fi
+}
+function run_if_available {
+  if command -v "$1" >/dev/null 2>&1; then
+    "$@"
+  else
+    echo "$1 is not installed. Please install it to use this feature." >&2
+  fi
+}
+
+export self_path=$(dirname "$(readlink -f "$0")")
+
+# Clear out the existing build artifacts as these aren't automatically removed by wasm-pack.
+if [ -d ${self_path}/pkg/ ]; then
+    rm -rf ${self_path}/pkg/
+fi
+
+# TODO: Handle the wasm target being built in release mode
+TARGET=wasm32-unknown-unknown
+WASM_BINARY=${self_path}/../../target/${TARGET}/release/${pname}.wasm
+
+NODE_DIR=${self_path}/pkg/nodejs/
+BROWSER_DIR=${self_path}/pkg/web/
+NODE_WASM=${NODE_DIR}/${pname}_bg.wasm
+BROWSER_WASM=${BROWSER_DIR}/${pname}_bg.wasm
+
+# Build the new wasm package
+run_or_fail cargo build --lib --release --package noir_wasm --target wasm32-unknown-unknown
+run_or_fail wasm-bindgen $WASM_BINARY --out-dir $NODE_DIR --typescript --target nodejs
+run_or_fail wasm-bindgen $WASM_BINARY --out-dir $BROWSER_DIR --typescript --target web
+run_if_available wasm-opt $NODE_WASM -o $NODE_WASM -O
+run_if_available wasm-opt $BROWSER_WASM -o $BROWSER_WASM -O
diff --git a/crates/wasm/installPhase.sh b/crates/wasm/installPhase.sh
index 4dd1473b941..f57875f4780 100755
--- a/crates/wasm/installPhase.sh
+++ b/crates/wasm/installPhase.sh
@@ -1,9 +1,14 @@
 #!/usr/bin/env bash
+export self_path=$(dirname "$(readlink -f "$0")")
 
 mkdir -p $out
-cp ./crates/wasm/README.md $out/
-cp ./crates/wasm/package.json $out/
-cp -r ./pkg/* $out/
+
+cp ${self_path}/README.md ${self_path}/pkg/
+cp ${self_path}/package.json ${self_path}/pkg/
+cp -r ${self_path}/pkg/* $out/
 
 echo "## Tracking" >> $out/README.md
 echo "Built from [noir-lang/noir@$GIT_COMMIT](https://github.com/noir-lang/noir/tree/$GIT_COMMIT)" >> $out/README.md
+
+# Cleanup temporary pkg directory
+rm -r $self_path/pkg
diff --git a/crates/wasm/postBuild.sh b/crates/wasm/postBuild.sh
deleted file mode 100755
index 1b01901adbe..00000000000
--- a/crates/wasm/postBuild.sh
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/usr/bin/env bash
-
-# TODO: Handle the wasm target being built in release mode
-WASM_BINARY=./target/wasm32-unknown-unknown/release/${pname}.wasm
-NODE_WASM=./pkg/nodejs/${pname}_bg.wasm
-BROWSER_WASM=./pkg/web/${pname}_bg.wasm
-
-wasm-bindgen $WASM_BINARY --out-dir ./pkg/nodejs --typescript --target nodejs
-wasm-bindgen $WASM_BINARY --out-dir ./pkg/web --typescript --target web
-wasm-opt $NODE_WASM -o $NODE_WASM -O
-wasm-opt $BROWSER_WASM -o $BROWSER_WASM -O
diff --git a/crates/wasm/preBuild.sh b/crates/wasm/preBuild.sh
deleted file mode 100644
index aa334e022c6..00000000000
--- a/crates/wasm/preBuild.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-
-# Clear out the existing build artifacts as these aren't automatically removed by wasm-pack.
-if [ -d ./pkg/ ]; then
-    rm -rf ./pkg/
-fi
\ No newline at end of file
diff --git a/flake.nix b/flake.nix
index a7bd0e39a7e..ea677501147 100644
--- a/flake.nix
+++ b/flake.nix
@@ -306,8 +306,8 @@
           toml2json
         ];
 
-        postBuild = ''
-          bash crates/wasm/postBuild.sh
+        buildPhaseCargoCommand = ''
+          bash crates/wasm/buildPhaseCargoCommand.sh
         '';
 
         installPhase = ''