wasm-bindgen · daxpedda · Mar 17, 2026
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
@@ -14,7 +14,9 @@ env:
 
 jobs:
   client:
-    name: Build Client ${{ matrix.os.description }}
+    name:
+      Build Client ${{ matrix.os.description }} ${{ matrix.target.description }} ${{
+      matrix.target-feature.description }}
 
     runs-on: ${{ matrix.os.os }}
 
@@ -27,6 +29,25 @@ jobs:
           - { os: ubuntu-latest, description: Linux }
           - { os: macos-latest, description: MacOS }
           - { os: windows-latest, description: Windows }
+        target:
+          - { target: wasm32-unknown-unknown, install: true, rust: stable, description: Wasm32 }
+          - {
+              target: wasm64-unknown-unknown,
+              install: false,
+              rust: nightly,
+              components: -c rust-src,
+              args: '-Zbuild-std="panic_abort,std"',
+              description: Wasm64,
+            }
+        target-feature:
+          - {}
+          - {
+              rust: nightly,
+              components: -c rust-src,
+              rustflags: -Ctarget-feature=+atomics -Clink-arg=--shared-memory,
+              args: '-Zbuild-std="panic_abort,std"',
+              description: Atomics,
+            }
 
     defaults:
       run:
@@ -36,16 +57,28 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Install Rust
-        run: rustup target add wasm32-unknown-unknown
+        run: |
+          rustup install --profile minimal ${{ matrix.target-feature.components || matrix.target.components }} ${{ matrix.target-feature.rust || matrix.target.rust }}
+          rustup default ${{ matrix.target-feature.rust || matrix.target.rust }}
+      - name: Install Target
+        if: matrix.target.install
+        run: rustup target add ${{ matrix.target.target }}
+      - name: Set Target `RUSTFLAG`
+        shell: bash
+        run: |
+          TARGET=$(echo "${{ matrix.target.target }}" | tr '[:lower:]-' '[:upper:]_')
+          echo "CARGO_TARGET_${TARGET}_RUSTFLAGS=${{ matrix.target-feature.rustflags }}" >> $GITHUB_ENV
       - name: Install LLVM
         uses: ZhongRuoyu/setup-llvm@ec41d6e5f3c15c96fa642a49c6e7effac6261778
         with:
           # Rustc v1.93
           llvm-version: 21
       - name: Install TSC
-        if: runner.os == 'macOS'
+        if: runner.os == 'macOS' || runner.os == 'Windows'
         run: npm install -g typescript
       - name: Build Crates
-        run: cargo build --workspace --all-features
+        run: cargo build --workspace --target ${{ matrix.target.target }} ${{ matrix.target.args }}
       - name: Build Examples
-        run: cargo build --examples --all-features
+        run:
+          cargo build --examples --target ${{ matrix.target.target }} ${{ matrix.target-feature.args
+          || matrix.target.args }}
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
@@ -46,7 +46,9 @@ jobs:
         run: cargo test --all-features --no-fail-fast
 
   client:
-    name: Test Client ${{ matrix.os.description }}
+    name:
+      Test Client ${{ matrix.os.description }} ${{ matrix.target.description }} ${{
+      matrix.target-feature.description }}
 
     runs-on: ${{ matrix.os.os }}
 
@@ -59,6 +61,25 @@ jobs:
           - { os: ubuntu-latest, description: Linux }
           - { os: macos-latest, description: MacOS }
           - { os: windows-latest, description: Windows }
+        target:
+          - { target: wasm32-unknown-unknown, install: true, rust: stable, description: Wasm32 }
+          - {
+              target: wasm64-unknown-unknown,
+              install: false,
+              rust: nightly,
+              components: -c rust-src,
+              args: '-Zbuild-std="panic_abort,std"',
+              description: Wasm64,
+            }
+        target-feature:
+          - {}
+          - {
+              rust: nightly,
+              components: -c rust-src,
+              rustflags: -Ctarget-feature=+atomics -Clink-arg=--shared-memory,
+              args: '-Zbuild-std="panic_abort,std"',
+              description: Atomics,
+            }
 
     defaults:
       run:
@@ -68,19 +89,64 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Install Rust
-        run: rustup target add wasm32-unknown-unknown
+        run: |
+          rustup install --profile minimal ${{ matrix.target-feature.components || matrix.target.components }} ${{ matrix.target-feature.rust || matrix.target.rust }}
+          rustup default ${{ matrix.target-feature.rust || matrix.target.rust }}
+      - name: Install Target
+        if: matrix.target.install
+        run: rustup target add ${{ matrix.target.target }}
+      - name: Set Target `RUSTFLAG`
+        shell: bash
+        run: |
+          TARGET=$(echo "${{ matrix.target.target }}" | tr '[:lower:]-' '[:upper:]_')
+          echo "CARGO_TARGET_${TARGET}_RUSTFLAGS=${{ matrix.target-feature.rustflags }}" >> $GITHUB_ENV
       - name: Install LLVM
         uses: ZhongRuoyu/setup-llvm@ec41d6e5f3c15c96fa642a49c6e7effac6261778
         with:
           # Rustc v1.93
           llvm-version: 21
       - name: Install TSC
-        if: runner.os == 'macOS'
+        if: runner.os == 'macOS' || runner.os == 'Windows'
         run: npm install -g typescript
       - name: Update Node.js
         if: runner.os == 'Linux' || runner.os == 'macOS'
         uses: actions/setup-node@v6
         with:
           node-version: latest
-      - name: Run Tests
-        run: cargo test --workspace --all-features --no-fail-fast
+      - name: Run Tests - NodeJs
+        env:
+          JBG_TEST_RUNNER: node-js
+        run:
+          cargo test --workspace --all-features --no-fail-fast --target ${{ matrix.target.target }}
+          ${{ matrix.target-feature.args || matrix.target.args }}
+      - name: Install Deno
+        if: runner.os == 'Linux' || runner.os == 'macOS'
+        uses: denoland/setup-deno@v2
+      - name: Run Tests - Deno
+        env:
+          JBG_TEST_RUNNER: deno
+        run:
+          cargo test --workspace --all-features --no-fail-fast --target ${{ matrix.target.target }}
+          ${{ matrix.target-feature.args || matrix.target.args }}
+      - name: Run Tests - Chrome
+        env:
+          JBG_TEST_RUNNER: browser
+          JBG_TEST_CHROMEDRIVER: chromedriver
+        run:
+          cargo test --workspace --all-features --no-fail-fast --target ${{ matrix.target.target }}
+          ${{ matrix.target-feature.args || matrix.target.args }}
+      - name: Run Tests - Firefox
+        env:
+          JBG_TEST_RUNNER: browser
+          JBG_TEST_GECKODRIVER: geckodriver
+        run:
+          cargo test --workspace --all-features --no-fail-fast --target ${{ matrix.target.target }}
+          ${{ matrix.target-feature.args || matrix.target.args }}
+      - name: Run Tests - Safari
+        if: runner.os == 'macOS'
+        env:
+          JBG_TEST_RUNNER: browser
+          JBG_TEST_SAFARIDRIVER: safaridriver
+        run:
+          cargo test --workspace --all-features --no-fail-fast --target ${{ matrix.target.target }}
+          ${{ matrix.target-feature.args || matrix.target.args }}
diff --git a/client/js-sys/build.rs b/client/js-sys/build.rs
@@ -10,6 +10,7 @@ fn main() -> io::Result<()> {
 		search_folder(&env::current_dir()?)?;
 
 		let status = Command::new("cargo")
+			.env_remove("CARGO_ENCODED_RUSTFLAGS")
 			.current_dir("../../host")
 			.arg("+stable")
 			.arg("run")

diff --git a/client/web-sys/build.rs b/client/web-sys/build.rs
@@ -10,6 +10,7 @@ fn main() -> io::Result<()> {
 		search_folder(&env::current_dir()?)?;
 
 		let status = Command::new("cargo")
+			.env_remove("CARGO_ENCODED_RUSTFLAGS")
 			.current_dir("../../host")
 			.arg("+stable")
 			.arg("run")

diff --git a/common/linker.cmd b/common/linker.cmd
@@ -20,7 +20,8 @@
 :: Never reached on UNIX because we execute `exit`.
 @echo off
 pushd "%~dp0..\host\ld\src\js"
-tsc --build || exit /b %ERRORLEVEL%
+tsc --build
+if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
 popd
 pushd "%~dp0..\host"
 cargo +stable run -q -p js-bindgen-ld -- %*

diff --git a/common/runner.cmd b/common/runner.cmd
@@ -25,11 +25,14 @@
 :: Never reached on UNIX because we execute `exit`.
 @echo off
 pushd "%~dp0..\host\ld\src\js"
-tsc --build || exit /b %ERRORLEVEL%
+tsc --build
+if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
 popd
 pushd "%~dp0..\host\runner\src\js"
-npm install -s --prefer-offline --no-audit --no-fund || exit /b %ERRORLEVEL%
-tsc --build || exit /b %ERRORLEVEL%
+npm install -s --prefer-offline --no-audit --no-fund
+if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+tsc --build
+if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
 popd
 pushd "%~dp0..\host"
 cargo +stable run -q -p js-bindgen-runner -- %*