howto-set-type-for-react-native-event-types-on-typescript.tsx

// The type for the event is NativeSyntheticEvent<TextInputChangeEventData>

// example 1

import { TextInput, NativeSyntheticEvent, TextInputChangeEventData } from "react-native";
const onChange = (e: NativeSyntheticEvent<TextInputChangeEventData>): void => {
    const value = e.nativeEvent.text;
    doStuff(value);
  }
  
// eample 2 
import { NativeSyntheticEvent, TextLayoutEventData } from "react-native"
const onTextLayout = (event: NativeSyntheticEvent<TextLayoutEventData>) => {