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

bindings/wasm/examples/example.js

@@ -1,3 +1,5 @@
-import limbo from "../pkg/limbo_wasm.js";
+import { Database } from 'limbo-wasm';
 
-const db = limbo.Database.open();
+const db = new Database(':memory:');
+
+db.exec("SELECT 'hello, world' AS message");

bindings/wasm/examples/package.json

@@ -11,5 +11,6 @@
   "author": "",
   "license": "MIT",
   "dependencies": {
+    "limbo-wasm": "../pkg"
   }
 }

bindings/wasm/lib.rs

@@ -9,12 +9,17 @@ pub struct Database {
 
 #[wasm_bindgen]
 impl Database {
-    pub fn open(_path: &str) -> Database {
+    #[wasm_bindgen(constructor)]
+    pub fn new(_path: &str) -> Database {
         let io = Rc::new(IO {});
         let page_source = limbo_core::PageSource::from_io(Rc::new(PageIO {}));
         let inner = limbo_core::Database::open(io, page_source).unwrap();
         Database { _inner: inner }
     }
+
+    #[wasm_bindgen]
+    pub fn exec(&self, _sql: &str) {
+    }
 }
 
 pub struct IO {}