message: [cli] Use `sleep()` util function in `vc dev`
diff: @@ -45,6 +45,7 @@ import _frameworks, { Framework } from '@vercel/frameworks';
  import cmd from '../output/cmd';
  import link from '../output/link';
  +import sleep from '../sleep';
  import { Output } from '../output';
  import { relative } from '../path-helpers';
  import { getDistTag } from '../get-dist-tag';
  @@ -2377,10 +2378,6 @@ function needsBlockingBuild(buildMatch: BuildMatch): boolean {
  return typeof builder.shouldServe !== 'function';
  }
  -async function sleep(n: number) {
  - return new Promise(resolve => setTimeout(resolve, n));
  -}
  -
  async function checkForPort(
  port: number | undefined,
  timeout: number
  