Support Wasi as target (#216)

* Improve features
* Add wasm32-wasi as a target
* Update .github/workflows/ci.yml
Co-authored-by: morenol <22335041+morenol@users.noreply.github.com>

.github/workflows/ci.yml

@@ -19,6 +19,7 @@ jobs:
             { os: "ubuntu", target: "i686-unknown-linux-gnu" },
             { os: "ubuntu", target: "wasm32-unknown-unknown" },
             { os: "macos", target: "aarch64-apple-darwin" },
+            { os: "ubuntu", target: "wasm32-wasi" },
           ]
     env:
       TZ: "/usr/share/zoneinfo/your/location"
@@ -42,6 +43,9 @@ jobs:
       - name: Install test runner for wasm
         if: matrix.platform.target == 'wasm32-unknown-unknown'
         run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+      - name: Install test runner for wasi
+        if: matrix.platform.target == 'wasm32-wasi'
+        run: curl https://wasmtime.dev/install.sh -sSf | bash
       - name: Stable Build
         uses: actions-rs/cargo@v1
         with:
@@ -56,6 +60,12 @@ jobs:
       - name: Tests in WASM
         if: matrix.platform.target == 'wasm32-unknown-unknown'
         run: wasm-pack test --node -- --all-features
+      - name: Tests in WASI
+        if: matrix.platform.target == 'wasm32-wasi'
+        run: |
+          export WASMTIME_HOME="$HOME/.wasmtime"
+          export PATH="$WASMTIME_HOME/bin:$PATH"
+          cargo install cargo-wasi && cargo wasi test
 
   check_features:
     runs-on: "${{ matrix.platform.os }}-latest"