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2024-09-23 11:12:42 +08:00
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@@ -490,7 +490,7 @@ function assertIsDefined<T>(
上面示例中，工具类型`NonNullable<T>`对应类型`T`去除空类型后的剩余类型。
如果要将断言函数用于函数表达式，可以采用下面的写法。根据 TypeScript 的[要求](https://github.com/microsoft/TypeScript/pull/33622)，这时函数表达式所赋予的变量，必须有明确的类型声明。
如果要将断言函数用于函数表达式，可以采用下面的写法。根据 TypeScript 的[要求](https://github.com/microsoft/TypeScript/pull/33622#issuecomment-575301357)，这时函数表达式所赋予的变量，必须有明确的类型声明。
```typescript
type AssertIsNumber =