If you are still looking for the onChange function signature, I think it’s the following:
onChange({
target: {
name,
value,
type
}
})
The callback is defined in @strapi/admin/admin/src/content-manager/components/EditViewDataManagerProvider/index.js, actually at line 232
const handleChange = useCallback(
({ target: { name, value, type } }, shouldSetInitialValue = false) => {
Regards,
M.