Function waitForSelector

packages/vue/__tests__/e2e/e2eBrowserUtils.ts:251–279

(selector)

    },

    async waitForSelector(selector) {
      const existing = document.querySelector(selector)
      if (existing) {
        return existing
      }

      return await new Promise<Element>((resolve, reject) => {
        const observer = new MutationObserver(() => {
          const el = document.querySelector(selector)
          if (el) {
            cleanup()
            resolve(el)
          }
        })
        const timer = setTimeout(() => {
          cleanup()
          reject(new Error(`Timed out waiting for selector: ${selector}`))
        }, 1000)
        const cleanup = () => {
          clearTimeout(timer)
          observer.disconnect()
        }

        observer.observe(document.documentElement, {
          childList: true,
          subtree: true,
        })
      })
    },

    async evaluate(fn: (...args: any[]) => any, arg?: unknown) {
      const result = await fn(arg)