feat: add JavaScript bindings generation and transpilation for WIT components

- Implemented `generateJsBindings` and `generateJsBindingsFromPath` for generating TypeScript bindings from WIT content.
- Added `transpileJsHost` and `transpileJsHostFromPath` for transpiling WebAssembly components into JavaScript host modules.
- Introduced interfaces and types for binding options and results.
- Created tests for guest and host bindings generation, including complex WIT definitions and command contributions.
- Ensured backward compatibility with deprecated aliases for guest and host bindings.
- Implemented edge case tests for WitFormatter to ensure proper formatting of various input scenarios.
- Added comprehensive tests for WitSyntaxValidator, covering error parsing and diagnostic creation.
- Introduced file-based tests for WASM detection utilities to validate header reading and component identification.
- Enhanced vitest configuration to include coverage reporting for better test insights.
- Added a new command for running unit tests with coverage.

Signed-off-by: Gordon Smith <GordonJSmith@gmail.com>

Author: GordonSmith

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
         fail-fast: false
         matrix:
           os: [ubuntu-latest, windows-latest, macos-latest]
-          node-version: [20, 22, 24]
+          node-version: [22, 24]
       runs-on: ${{ matrix.os }}
       permissions:
         contents: read
@@ -30,7 +30,7 @@ jobs:
         - name: Setup Rust toolchain
           uses: dtolnay/rust-toolchain@stable
           with:
-            targets: wasm32-unknown-unknown
+            targets: wasm32-unknown-unknown,wasm32-wasip2
 
         - name: Cache Rust dependencies
           uses: Swatinem/rust-cache@v2

.gitignore

@@ -72,6 +72,9 @@ typings/
 # Typescript Output
 dist/
 
+# Rust build artifacts
+samples/target/
+
 # VSCode extension development
 .vscode-test/
 *.vsix
@@ -80,3 +83,6 @@ dist/
 types/
 out/
 tmp/
+
+# Test coverage
+coverage/

.prettierignore

@@ -16,6 +16,7 @@ dist/
 *.vsix
 wit-bindgen-wasm/pkg/
 wit-bindgen-wasm/target/
+samples/target/
 
 # Test snapshots (these are auto-generated and shouldn't be manually formatted)
 *.snap

.vscode/launch.json

@@ -6,7 +6,7 @@
     "version": "0.2.0",
     "configurations": [
         {
-            "name": "Extension",
+            "name": "default",
             "type": "extensionHost",
             "request": "launch",
             "runtimeExecutable": "${execPath}",
@@ -15,6 +15,17 @@
                 "--extensionDevelopmentPath=${workspaceFolder}",
                 "${workspaceRoot}/tests/grammar"
             ]
+        },
+        {
+            "name": "samples",
+            "type": "extensionHost",
+            "request": "launch",
+            "runtimeExecutable": "${execPath}",
+            "args": [
+                "--disable-extensions",
+                "--extensionDevelopmentPath=${workspaceFolder}",
+                "${workspaceRoot}/samples"
+            ]
         }
     ]
 }