javascript - 如何在动态接口(interface)中访问泛型类型属性

Question

我想访问接口(interface)中的动态 T 属性来扩展他的类型以允许这种通用函数:

type AnotherType<T extends {}> = T & {
    prop: boolean;
    prop2: string;
};

interface SpecialInterface<T> {
    someProperty: AnotherType<{T["someProperty"]}>; // I know what key of T I want to extends but can't understand how
}

const func = <T extends SpecialInterface<T>>(prop: T) => {
    const a = prop.someProperty.prop; // I would like no error on this
    // somethings
}

我现在使用这个，它可以工作，但我不喜欢任何类型允许函数属性上的所有内容:

interface SpecialInterface<T> {
    someProperty: AnotherType<{[key: string]: any}>;
}

发送到 func 的 prop 示例:

interface IProp {
    someProperty: AnotherType<{prop3: number}>
}

const prop: IProp = {
    someProperty: {
        prop: true,
        prop2: "test",
        prop3 : 5
    }
}

有什么想法吗？

Answer 1

希望对你有帮助

interface Another {
    key: number;
    value: string;
}

interface ExtraAnother extends Another {
    someProperty: number;
}

interface SpecialInterface<T extends Another> {
    someProperty: T
};

const func = (prop: SpecialInterface<ExtraAnother>) => {
    const a = prop.someProperty; // I would like no error on this
    // somethings
};