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Recent questions tagged typescript设置了默认，结果还报

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typescript设置了默认，结果还报 undefined
    我前面判断SELECTION_CACHE[selectionStateKey][cachedActiveType]是否为undefined， 如果是undefined给了默认值{}，最后 typescript报错说 ... [selectionStateKey][cachedActiveType]可能是undefined 这怎么解决？？？...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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