Support build_web_compilers

Author: simolus3

packages/powersync_core/lib/src/open_factory/abstract_powersync_open_factory.dart

@@ -1,7 +1,7 @@
 import 'dart:async';
-import 'package:universal_io/io.dart';
 import 'dart:math';
 
+import 'package:meta/meta.dart';
 import 'package:powersync_core/sqlite_async.dart';
 import 'package:powersync_core/src/open_factory/common_db_functions.dart';
 import 'package:sqlite_async/sqlite3_common.dart';
@@ -70,6 +70,11 @@ abstract class AbstractPowerSyncOpenFactory extends DefaultSqliteOpenFactory {
   /// Returns the library name for the current platform.
   /// [path] is optional and is used when the library is not in the default location.
   String getLibraryForPlatform({String? path});
+
+  /// On native platforms, synchronously pauses the current isolate for the
+  /// given [Duration].
+  @visibleForOverriding
+  void sleep(Duration duration) {}
 }
 
 /// Advanced: Define custom setup for each SQLite connection.

packages/powersync_core/lib/src/open_factory/native/native_open_factory.dart

@@ -1,8 +1,9 @@
+import 'dart:io';
+import 'dart:io' as io;
 import 'dart:ffi';
 
 import 'package:powersync_core/src/exceptions.dart';
 import 'package:powersync_core/src/log.dart';
-import 'package:universal_io/io.dart';
 import 'dart:isolate';
 import 'package:powersync_core/src/open_factory/abstract_powersync_open_factory.dart';
 import 'package:sqlite_async/sqlite3.dart' as sqlite;
@@ -109,4 +110,9 @@ class PowerSyncOpenFactory extends AbstractPowerSyncOpenFactory {
         );
     }
   }
+
+  @override
+  void sleep(Duration duration) {
+    io.sleep(duration);
+  }
 }

packages/powersync_core/pubspec.yaml

@@ -14,7 +14,6 @@ dependencies:
   sqlite3: ^2.4.6
   # We implement a database controller, which is an interface of sqlite3_web.
   sqlite3_web: ^0.3.2
-  universal_io: ^2.0.0
   meta: ^1.0.0
   http: ^1.5.0
   uuid: ^4.2.0