具有多种类型和类型化数组的 Vuejs 道具验证

Question

使用 Vuejs 3 和 Typescript，目标是获得 string | string[] 类型的 prop。查看the docs，看起来我应该能够使用多种类型设置道具，如下所示：

props: {
    prop1: {type: [String, Array], default: ""}
}

查看Vetur commit 和the docs again，看起来我应该能够像这样设置数组道具类型：

props: {
    prop1: {type: Array as PropType<string[]>, default: []}
}

我可以让这两个单独工作没有问题，但是当我尝试将它们结合起来时，我得到一个错误：

props: {
    prop1: {type: [String, Array as PropType<string[]>], default: ""}
}

No overload matches this call.
The last overload gave the following error.
    Type '{ type: (StringConstructor | (new (...args: any[]) => string[] & object) | (() => string[]) | PropConstructor<string[]>[])[]; default: string; }' is not assignable to type 'PropOptions<unknown, unknown> | (new (...args: any[]) => object) | (() => unknown) | PropConstructor<unknown>[] | null'.
    Types of property 'type' are incompatible.
        Type '(StringConstructor | (new (...args: any[]) => string[] & object) | (() => string[]) | PropConstructor<string[]>[])[]' is not assignable to type 'true | (new (...args: any[]) => object) | (() => unknown) | PropConstructor<unknown>[] | null | undefined'.
        Type '(StringConstructor | (new (...args: any[]) => string[] & object) | (() => string[]) | PropConstructor<string[]>[])[]' is not assignable to type 'PropConstructor<unknown>[]'.
            Type 'StringConstructor | (new (...args: any[]) => string[] & object) | (() => string[]) | PropConstructor<string[]>[]' is not assignable to type 'PropConstructor<unknown>'.
            Type 'PropConstructor<string[]>[]' is not assignable to type 'PropConstructor<unknown>'.
                Type 'PropConstructor<string[]>[]' is not assignable to type '() => unknown'.
                Type 'PropConstructor<string[]>[]' provides no match for the signature '(): unknown'.

我不确定用于定义类型的数组语法与直接使用PropType 之间有什么不同，但它对那里的某些东西非常不满意。我也对错误中提到的未知内容感到有些困惑，因为我希望所有内容都是字符串或数组。

Answer 1

这似乎有效：

props: {
    prop1: {type: [Array, String] as PropType<string[] | string>, default: ""}
}

您似乎必须转换整个类型，否则您会收到警告。似乎Array 默认为uknown[] 类型