mongoose/types/callback.d.ts

Mongoose MongoDB ODM

declare module 'mongoose' {
  type CallbackError = NativeError | null;

  type Callback<T = any> = (error: CallbackError, result: T) => void;

  type CallbackWithoutResult = (error: CallbackError) => void;
  type CallbackWithoutResultAndOptionalError = (error?: CallbackError) => void;
}