react native instance class not running in js side - react-native

Question

I have this class:
export default class CallManager{
static instance = null
calls = []
static getInstance() {
if (CallManager.instance == null) {
CallManager.instance = new CallManager()
}
return this.instance;
}
addCall(callUUID, data){
this.calls.push({
callId : callUUID,
data: data
})
}
removeCall(callUUID){
this.calls = this.calls.filter(c => c.callId != callUUID)
}
getAllCall(){
return this.calls
}
}
When ios app killed + get incoming call (with RNCallKeep), I'm using this class to store new call like this:
RNCallKeep.addEventListener('didDisplayIncomingCall', ({ error, callUUID, handle, localizedCallerName, hasVideo, fromPushKit, payload }) => {
// you might want to do following things when receiving this event:
// - Start playing ringback if it is an outgoing call
console.log('didDisplayIncomingCall', error, callUUID, handle, localizedCallerName, hasVideo, fromPushKit, payload)
try {
CallManager.getInstance().addCall(callUUID, { ...payload})
} catch (error) {
console.log('didDisplayIncomingCall error', error)
RNCallKeep.endCall(callUUID)
}
})
const answerCall = ({callUUID}) => {
console.log(`[answerCall] ${callUUID}`)
RNCallKeep.answerIncomingCall(callUUID)
const callData = CallManager.getInstance().getAllCall().find(c => c.callId.toString().toUpperCase() === callUUID.toString().toUpperCase())
....
}
But after debug, i got getAllCall return empty. Can someone help?