Typescript error for Message (onMessageArrived)

[kabaluyot]

I followed the angular template using vue-template-ts and I got this error

[edusperoni]

Since message can be undefined, you can use .on((message?: Message) => {

[kabaluyot]

Can I little help with TS? :),

It says Object is possibly undefined

[edusperoni]

you can use:

if (message) {
// do stuff with message
}