Function _getProps

packages/core/src/SpringRef.ts:173–179

(
    arg: ControllerUpdate<State> | ControllerUpdateFn<State>,
    ctrl: Controller<State>,
    index: number
  )

  /** Overridden by `useTrail` to manipulate props */
  const _getProps = function (
    arg: ControllerUpdate<State> | ControllerUpdateFn<State>,
    ctrl: Controller<State>,
    index: number
  ) {
    return is.fun(arg) ? arg(index, ctrl) : arg
  }

  SpringRef._getProps = _getProps