How to use the omi.getHost function in omi

this.longTapTimeout = null;
    this.singleTapTimeout = null;
    this.swipeTimeout = null;
    this.x1 = this.x2 = this.y1 = this.y2 = null;
    this.preTapPosition = { x: null, y: null };

    // Disable taps after longTap
    this.afterLongTap = false;
    this.afterLongTapTimeout = null;

    this._handleTouchStart = this._handleTouchStart.bind(this)
    this._handleTouchMove = this._handleTouchMove.bind(this)
    this._handleTouchCancel = this._handleTouchCancel.bind(this)
    this._handleTouchEnd = this._handleTouchEnd.bind(this)

    this.css = getHost(this).css
  }

install() {
		this.css = getHost(this).css
	}

install() {
    this.css = getHost(this).css
  }

css() {
    return style + getHost(this).css()
  }

install() {
    //@ts-ignore 不是 slot，所以需要共享一下 host 的 css
    this.css = getHost(this).constructor.css
  }

css() {
    return getHost(this).css() + css
  }

css() {
    let pCss = getHost(this).css

    return style + '  ' + pCss()
  }