React useState hook getting oldState inside a callback
My state has such form:
const [state, setState] = useState({ ua: null, session: null, pcConfig: {}, indicatePower: null, indicateMic: null, indicateSignIn: null, indicatePhone: null, isMuted: false, }); I have such useEffect function.
useEffect(() => { JsSIP.debug.enable("JsSIP:*"); if (dn != null) { ... ua.on("newRTCSession", (e) => { setState((prevState) => ({ ...prevState, session: e.session })); let waitingIceCandidates = false; if (e.originator === "remote") { ... e.session.on("notify-talk", () => { //stopSound(); setTimeout(answer, 100); }); e.session.on("accepted", () => { playSignal(); }); } }); setState((prevState) => ({ ...prevState, ua: ua })); ua.start(); } else { console.log("ERROR: DN is not passed to softphone!"); } }, []); And this callback function
const answer = () => { console.log("ANSWER", state); if ( state.ua != null && state.session != null && state.session.isInProgress() ) { navigator.mediaDevices .getUserMedia({ audio: true, }) .then((stream) => { state.session.answer({ mediaConstraints: { audio: true, video: false, }, pcConfig: state.pcConfig, mediaStream: stream, }); }); } }; So, the problem is when answer function gets called state condition is still initial though if I create another useEffect function and provide the state inside an array of arguments it updates!! I have no idea what is the problem with this code. Also there was a problem(maybe it helps) with setState function – it works properly only via callback with prevState and doesn`t work like this
setState({...state, indicatorPower: true}) 
