我找不到“displayName”的匹配 TypeScript 类型作为“type”的支柱

Mat*_*ats 14 javascript type-conversion typescript reactjs

正如标题所述,我找不到正确的类型。我已经检查了 DevTools 和我以编程方式查看的每个组件 HAS Component.type.displayName。对于任何type不是 a 的东西来说,ElementType都是一个函数。

节点的类型是像这样提取的 React.isValidElement 的返回类型Parameters<typeof React.isValidElement>,因为我不确定它是什么。

有问题的部分:

const node = SomeThingUnknown as Parameters<typeof React.isValidElement>;
const type = ((node as unknown) as React.ReactElement<React.FunctionComponent>).type;
const displayName = typeof type === "function" ? type.displayName || type.name || "Unknown" : type;
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最后一行取自React存储库。所以我知道它有效。

node,在 VS Code 中是:

const type: string | ((props: any) => React.ReactElement<any, string | ... | (new (props: any) =>
  React.Component<any, any, any>)> | null) | (new (props: any) => React.Component<any, any, any>)
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当我将鼠标悬停在上面时出现的错误displayName是:

Property 'displayName' does not exist on type 'JSXElementConstructor<any>'.
  Property 'displayName' does not exist on type '(props: any) =>
    ReactElement<any, string | ... | (new (props: any) => Component<any, any, any>)> | null'.
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Mat*_*ats -2

我想我解决了:

export function extractType(node: unknownElement): Function | string {
  return ((node as unknown) as React.ReactElement).type;
}
export function extractDisplayName(type: React.FunctionComponent): string {
  return type.displayName || type.name || "Unknown";
}
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然后调用它:

const type = extractType(node);
if (typeof type === "function") {
  const displayName = extractDisplayName((type as unknown) as React.FunctionComponent);
}
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