move compute to the main thread for browser and node

- now, most of the work is happening on the main thread
- for database in browser, we still have dedicated WebWorker - but it is used only for OPFS access and only for that
- for syn in browser we still offload sync operations to the WebWorker

bindings/javascript/sync/packages/native/index.d.ts

@@ -15,26 +15,6 @@ export declare class Database {
   get path(): string
   /** Returns whether the database connection is open. */
   get open(): boolean
-  /**
-   * Executes a batch of SQL statements on main thread
-   *
-   * # Arguments
-   *
-   * * `sql` - The SQL statements to execute.
-   *
-   * # Returns
-   */
-  batchSync(sql: string): void
-  /**
-   * Executes a batch of SQL statements outside of main thread
-   *
-   * # Arguments
-   *
-   * * `sql` - The SQL statements to execute.
-   *
-   * # Returns
-   */
-  batchAsync(sql: string): Promise<void>
   /**
    * Prepares a statement for execution.
    *
@@ -93,6 +73,16 @@ export declare class Database {
   ioLoopAsync(): Promise<void>
 }
 
+export declare class Opfs {
+  constructor()
+  connectDb(path: string, opts?: DatabaseOpts | undefined | null): Promise<unknown>
+  complete(completionNo: number, result: number): void
+}
+
+export declare class OpfsFile {
+
+}
+
 /** A prepared statement. */
 export declare class Statement {
   reset(): void
@@ -149,6 +139,12 @@ export declare class Statement {
 export interface DatabaseOpts {
   tracing?: string
 }
+
+/**
+ * turso-db in the the browser requires explicit thread pool initialization
+ * so, we just put no-op task on the thread pool and force emnapi to allocate web worker
+ */
+export declare function initThreadPool(): Promise<unknown>
 export declare class GeneratorHolder {
   resumeSync(error?: string | undefined | null): GeneratorResponse
   resumeAsync(error?: string | undefined | null): Promise<unknown>
@@ -220,7 +216,7 @@ export type DatabaseRowTransformResultJs =
 export type GeneratorResponse =
   | { type: 'IO' }
   | { type: 'Done' }
-  | { type: 'SyncEngineStats', operations: number, mainWal: number, revertWal: number, lastPullUnixTime: number, lastPushUnixTime?: number }
+  | { type: 'SyncEngineStats', operations: number, mainWal: number, revertWal: number, lastPullUnixTime: number, lastPushUnixTime?: number, revision?: string }
 
 export type JsProtocolRequest =
   | { type: 'Http', method: string, path: string, body?: Array<number>, headers: Array<[string, string]> }