Enhancing Interfaces with TypeScript Parameters

Currently, I have simplified interfaces that I combine to create various types:

interface MyObject {
    values: {
        [1]: number,
    }
}

interface MyOtherObject {
    values: {
        [2]: number,
    }
}

export type MyObjectType = MyObject & MyOtherObject & {};

As my project grows in size, I aim to develop a robust interface/type system for creating objects with multiple elements. One specific feature I require is the ability to use parameters in interfaces. Here's an example (even though it doesn't work as intended):

Is it possible to specify parameters within interfaces? For instance, I want to assign keys to object parameters. Below is an attempt at implementing this idea:

interface MyObject<index> {
    values: {
        [index]: number,
    }
}

export type MyFirstObjectType = MyObject<1> & MyObject<2> {};
export type MySecondObjectType = MyObject<1> & MyObject<3> {};

let newObject: MyFirstObjectType = {
    values: {
        [1]: 5,
        [2]: 3,
        // [3]: 5, this should not be allowed in "MyFirstObjectType", but allowed in "MySecondObjectType"
    }
}

While this might seem like a far-fetched idea, I'm putting it out there to explore potential solutions and maybe discover something new. It's entirely possible that a different approach without this functionality may be more suitable.

Answer №1

Don't worry, it's quite simple! Check out how to utilize mapped types:

interface CustomObject<index extends number> {
    attributes: {
        [Key in index]: number;
    }
}

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