The method for retrieving a generic type property within a dynamic interface

Is there a way to access a dynamic T property within an interface in order to enhance its typing for generic functions like this:

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

interface SpecialInterface<T> {
    someProperty: AnotherType<{T["someProperty"]}>;
}

const func = <T extends SpecialInterface<T>>(prop: T) => {
    const a = prop.someProperty.prop;
}

Currently, I am using the following approach which works but has any typing allowing everything on the function prop:

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

Here is an example of the prop sent to the func:

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

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

Does anyone have any suggestions or ideas on how to improve this?

Answer №1

I trust this information will be beneficial to you

interface DifferentInterface {
    id: number;
    name: string;
}

interface AdditionalInterface extends DifferentInterface {
    quantity: number;
}

interface UniqueInterface<U extends DifferentInterface> {
    itemDetails: U
};

const customFunction = (info: SpecialInterface<AdditionalInterface>) => {
    const b = info.itemDetails.quantity; // I hope no issues arise here
    // additional logic
};

Answer №2

To ensure that the object type T has a property named someProperty, you can add a generic constraint like

T extends Record<"someProperty", any>
. The Record type is built into TypeScript.

//                           v  add this constraint
interface SpecialInterface<T extends Record<"someProperty", any>> {
    someProperty: AnotherType<T["someProperty"]> // works
}

const func = <T extends SpecialInterface<T>>(prop: T) => {
    const a = prop.someProperty.prop; // works
}

Sample

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