How can I use the Required utility type in TypeScript for nested properties?

I'm exploring how to utilize the Required keyword to ensure that all members are not optional in TypeScript. I've achieved success with it so far, but I've run into an issue where it doesn't seem to work for nested members of an interface. Is there a method to inform TypeScript that all members should not be undefined?

interface Camera {
    id? :string;
    name? : {
        firstName?:string;
        secondName? :string
    };
    site? :string
}


const firstCamera :Required<Camera> ={
    id :'1',
    name :{},
    site :'hello world'
}

While the code above functions properly for the initial members, firstName and secondName remain optional. I am seeking a solution to make them required fields as well. Any guidance would be greatly appreciated. Thank you!

typescript

Answer №1

Break down the Camera interface into smaller components by creating a custom type called Name to store names. Utilize generics within the Camera interface and use the required utility function twice to specify mandatory fields. Explore and experiment with the code on the TS Playground

type Name = {
    firstName?: string;
    secondName?: string;
}
interface Camera<T> {
    id?: string;
    name?: T;
    site?: string;
}
const firstCamera :Required<Camera<Required<Name>>> ={
    id:'1',
    name:{},
    site :'hello world'
}

Answer №2

To ensure consistency, consider removing conditional modifiers on the firstName and secondName properties within the name object of the Camera interface. While the name itself remains optional, if it is provided then both firstName and secondName should also be present.

interface Camera {
    id?: string;
    name?: {
        firstName: string;
        secondName: string
    }
    site?: string
};

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