Merge branch 'dev-2.2.0' of http://120.26.58.240:8888/r/JYBIndependentFront...

zhengyiming

9 天以前 428839f8403028559c18c495dd872c21097172b9

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export function isDef<T = unknown>(val?: T): val is T {
  return typeof val !== 'undefined';
}