A dart binding of quickjs with latest ffi tool native_assets_cli.

Inspired by flutter_js, quickjs-dart is also used to run javascript code as a native citzen, but without flutter channels, and thanks to native_assets_cli, quickjs-dart could be integrated into any dart app (not flutter currently) with all platform support(except web). The integrated quickjs version is 2024-02-14.

Have a try with dart --enable-experiment=native-assets run example/example.dart

asynchronous

All interops with quickjs native code through dart:ffi run in a separated isolate, this could make sure js evaluation would not block the main isolate, also a different point from flutter_js.

final manager = await JsEngineManager.create();
final engine = await manager.createEngine('my-tag');
final result = await engine.eval('console.log("Hello~");');
print(result.stdout); // "Hello~"
await engine.dispose();
await manager.dispose();

Of course, quickjs-dart could aslo run in main isolate synchronously, just using different objects:

final manager = NativeEngineManager();
final engine = NativeJsEngine(name: 'my-tag');
final result = engine.eval('3-4');
print(result.value); // "-1"
engine.dispose();
manager.dispose();

notify callback

If you want to receive data directly from js code, you need register a notify callback in Dart side:

const code = """
let scope = {
  send(obj) {
    _ffiNotify("_sendMsg", JSON.stringify(obj));
  }
};
scope.send({"key": $variable_in_dart});
""";
engine.eval(code); // receive message but do nothing.
engine.registerBridge('_sendMsg', (obj) {
  final val = obj['key']; // $variable_in_dart
});
engine.eval(code); // receive message call dart callback.

remember to use the builtin _ffiNotify in js world.

builtin js functions

• console.log
• setTimeout
• _ffiNotify