Preserve error details.

Author: rkistner

packages/common/src/client/sync/stream/AbstractRemote.ts

@@ -314,14 +314,15 @@ export abstract class AbstractRemote {
 
     let socketCreationError: Error | undefined;
 
+    const url = this.options.socketUrlTransformer(request.url);
     const connector = new RSocketConnector({
       transport: new WebsocketClientTransport({
-        url: this.options.socketUrlTransformer(request.url),
+        url,
         wsCreator: (url) => {
           const s = this.createSocket(url);
-          s.addEventListener('error', (e: Event) => {
-            socketCreationError = new Error('Failed to create connection to websocket: ', (e.target as any).url ?? '');
-            this.logger.warn('Socket error', e);
+          s.addEventListener('error', (e: ErrorEvent) => {
+            socketCreationError = e.error ?? new Error(`Failed to create connection to websocket: ${url}`);
+            this.logger.warn('Socket error', socketCreationError);
           });
           return s;
         }
@@ -351,7 +352,7 @@ export abstract class AbstractRemote {
        * On React native the connection exception can be `undefined` this causes issues
        * with detecting the exception inside async-mutex
        */
-      throw new Error(`Could not connect to PowerSync instance: ${JSON.stringify(ex ?? socketCreationError)}`);
+      throw ex ?? socketCreationError;
     }
 
     const stream = new DataStream({