Improve JavaScript/Wasm packaging

.github/workflows/rust.yml

@@ -10,7 +10,7 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
+  build-native:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
@@ -23,3 +23,11 @@ jobs:
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+
+  build-wasm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install
+        run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+      - run: wasm-pack build --target nodejs bindings/wasm