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typescript 常用技巧 #44

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hardfist opened this issue Nov 11, 2019 · 0 comments

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hardfist commented Nov 11, 2019 •

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useRef避免null判断

  const ref1 = useRef<HTMLDivElement>(null!);// ref1.current就非空了

makeTuple

function makeTuple<T extends any[]>(...elements:T){
  return elements;
}

const x = makeTuple(1,'s','ss') // 推断为[number,string,string]

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