opfs for sync in one commit!

bindings/javascript/sync/packages/browser/worker.mjs

@@ -0,0 +1,55 @@
+import { instantiateNapiModuleSync, MessageHandler, WASI } from '@napi-rs/wasm-runtime'
+import { OpfsDirectory, workerImports } from "@tursodatabase/database-browser-common";
+
+var opfs = new OpfsDirectory();
+var memory = null;
+
+const handler = new MessageHandler({
+  onLoad({ wasmModule, wasmMemory }) {
+    memory = wasmMemory;
+    const wasi = new WASI({
+      print: function () {
+        // eslint-disable-next-line no-console
+        console.log.apply(console, arguments)
+      },
+      printErr: function () {
+        // eslint-disable-next-line no-console
+        console.error.apply(console, arguments)
+      },
+    })
+    return instantiateNapiModuleSync(wasmModule, {
+      childThread: true,
+      wasi,
+      overwriteImports(importObject) {
+        importObject.env = {
+          ...importObject.env,
+          ...importObject.napi,
+          ...importObject.emnapi,
+          ...workerImports(opfs, memory),
+          memory: wasmMemory,
+        }
+      },
+    })
+  },
+})
+
+globalThis.onmessage = async function (e) {
+  if (e.data.__turso__ == 'register') {
+    try {
+      await opfs.registerFile(e.data.path);
+      self.postMessage({ id: e.data.id });
+    } catch (error) {
+      self.postMessage({ id: e.data.id, error: error });
+    }
+    return;
+  } else if (e.data.__turso__ == 'unregister') {
+    try {
+      await opfs.unregisterFile(e.data.path);
+      self.postMessage({ id: e.data.id });
+    } catch (error) {
+      self.postMessage({ id: e.data.id, error: error });
+    }
+    return;
+  }
+  handler.handle(e)
+}