Common callbacks [v2]

There are 3 common callbacks in the project :

Name	Type description	Description
SimpleCallback	(error ?: Error) => void	Can give an error
ReturnCallback<T>	(error ?: Error, data ?: T) => void	Can give an error or a data of type T
Return2Callback<T, Q>	(error ?: Error, x ?: T, y ?: Q) => void	Can give an error or a tuple of x and y of type T and Q

TypeScript

export type SimpleCallback = (error ?: Error) => void
export type ReturnCallback<T> = (error ?: Error, data ?: T) => void
export type Return2Callback<T, Q> = (error ?: Error, x ?: T, y ?: Q) => void