moment should be null or undefined by default

[alex2wong]

When I was using typescript with ant-motion, I found moment set to null is unacceptable.
since the typing as follow:

export interface IProps<T> extends Omit<React.HTMLAttributes<T>, 'onChange'> {
  animation?: IAnimObject | IAnimObject[];
  paused?: boolean;
  reverse?: boolean;
  reverseDelay?: number;
  repeat?: number;
  yoyo?: boolean;
  onChange?: (e: IChangeProps) => void;
  moment?: number;  // should be number or undefined.
  attr?: IAttrType,
  resetStyle?: boolean,
  component?: string | React.ReactNode;
  componentProps?: {};
}

In vanilla Javascript, it is OK to set as null. but not in typescript, maybe you could change the API doc, to avoid misunderstanding.

https://motion.ant.design/api/tween-one-cn#API