How to use the @instructure/ui-dom-utils.contains function in @instructure/ui-dom-utils

handleFrameClick = (event, frame) => {
    if (!contains(this._contextElement, frame)) {
      // dismiss if frame is not within the region
      this.handleDismiss(event, true)
    }
  }

captureDocumentClick = event => {
    const { target } = event
    this._preventCloseOnDocumentClick = event.button !== 0 || contains(this._contextElement, target)
  }