initEmitHandler method
Full documentation: https://www.ezflap.io/advanced/interoperability/interoperability.html
Use initEmitHandler to "manually" provide event emit handlers to an ezFlap widget (for interoperability).
Implementation
void initEmitHandler(String key, Function onEmit) {
this._mapEmitHandlers ??= { };
this._mapEmitHandlers![key] = onEmit;
}