Method update

src/watcher.ts:251–261

()

        }
    }
    update() {
        this.isAboveViewport = this.top < this.container.viewportTop;
        this.isBelowViewport = this.bottom > this.container.viewportBottom;

        this.isInViewport =
            this.top < this.container.viewportBottom && this.bottom > this.container.viewportTop;
        this.isFullyInViewport =
            (this.top >= this.container.viewportTop &&
                this.bottom <= this.container.viewportBottom) ||
            (this.isAboveViewport && this.isBelowViewport);
    }
    destroy() {
        var index = this.container.watchers.indexOf(this),
            self = this;