javascript - 如何解析 FlowType 中的 "Property cannot be accessed on possibly null value"？

Question

以下函数签名:

type SaveComplete = {
  id: string
};

const handleReduce = ((state, { payload: { id } }: Action<SaveComplete>) => {
   // `id` is used unconditionally
};

...导致以下 FlowType 错误:

property `id`. Property cannot be accessed on possibly null value

如何修复此错误？

Answer 1

原因是Action的类型没有导入到文件中。