Method constructor

packages/core/src/Controller.ts:124–135

(
    props?: ControllerUpdate<State> | null,
    flush?: ControllerFlushFn<any>
  )

  }

  constructor(
    props?: ControllerUpdate<State> | null,
    flush?: ControllerFlushFn<any>
  ) {
    this._onFrame = this._onFrame.bind(this)
    if (flush) {
      this._flush = flush
    }
    if (props) {
      this.start({ default: true, ...props })
    }
  }

  /**
   * Equals `true` when no spring values are in the frameloop, and