`@class` with mapped types can incorrectly handle properties

[Gerrit0]

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@class defineComponent

Expected Behavior

declare function defineComponent<
    T extends Record<string, () => any>,
    U extends Record<string, any>,
>(component: {
    computed: T;
    props: U;
}): new () => U & { [K in keyof T]: ReturnType<T[K]> };

/** @class */
export const ComputedClass = defineComponent({
    computed: {
        hello() {
            return "hello";
        },
    },
    props: {
        name: "world",
    },
});

Should produce a class with a hello property which has type string

Actual Behavior

TypeDoc makes a class with a hello property of type any

Environment

• Typedoc version: 0.27.6
• TypeScript version: 5.7.2
• Node.js version: 20
• OS: Fedora

[Gerrit0]

I noticed this while working on typedoc-plugin-vue for #2841, there TypeDoc was behaving even more strangely, adding properties for each method on String to the resulting class, not sure why, but the same fix worked there.