Implement the Interface and utilize the object of its parent Interface

Suppose I have the following:

export interface Project {
    id: number;
    name: string;
    description: string;
    metaModel: { name: string, id: number };
    createdAt: string;
    lastEdited: string;
    visibilityLevel: VisibilityLevel;
    members: string[];
    m0files: M0File[];
}

Now I want to extend it as follows:

interface ProjectAndMembership extends Project{
    owner: boolean;
}

Is there a way to assign an object or a variable of Project to the new interface ProjectMembership with only providing a boolean value for the owner field?

Answer №1

Is it possible to implement an object/variable from Project into the new interface ProjectMembership in a way that only requires a boolean for the owner value?

You actually have two options:

  1. Create a fresh object using something like Object.assign:

    let x:ProjectAndMembership = Object.assign({}, {owner: true}, theProject);
    

    Playground Link

  2. Utilize a type assertion and simply add the property to the existing object:

    let x:ProjectAndMembership = theProject as ProjectAndMembership;
    x.owner = true;
    

    Playground Link

My preference would be #1.

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