How to use the velocity-animate.RegisterEffect function in velocity-animate

VelocityAnimator.prototype.registerEffect = function registerEffect(name, props) {
    if (name[0] === ':') {
      if (typeof props === 'string') {
        this.effects[name] = props;
      } else {
        throw new Error('second parameter must be a string when registering aliases');
      }
    } else {
      velocity.RegisterEffect(name, props);
    }
    return this;
  };

registerEffect(name, props) {
    if (name[0] === ':') {
      if (typeof props === 'string') {
        this.effects[name] = props;
      } else {
        throw new Error('second parameter must be a string when registering aliases');
      }
    } else {
      velocity.RegisterEffect(name, props);
    }
    return this;
  }

registerEffect(name:string, props: Object): VelocityAnimator {
    if (name[0] === ':') {
      if (typeof props === 'string') {
        this.effects[name] = props;
      } else {
        throw new Error('second parameter must be a string when registering aliases');
      }
    } else {
      velocity.RegisterEffect(name, props); //eslint-disable-line
    }
    return this;
  }

registerEffect(name:string, props: Object): VelocityAnimator {
    if (name[0] === ':') {
      if (typeof props === 'string') {
        this.effects[name] = props;
      } else {
        throw new Error('second parameter must be a string when registering aliases');
      }
    } else {
      velocity.RegisterEffect(name, props); //eslint-disable-line
    }
    return this;
  }