Want to define interface like this, to create nested paths, is it possible to define interface like this?

interface IPath {
    path: string;
    name: string;

    [key: Exclude<string, 'path' | 'name'>]: IPath
}

this approach not work, there is error: Property 'name' of type 'string' is not assignable to 'string' index type 'IPath'.ts(2411)

CodePudding user response：

You might be able to do it by constructing a massively-complicated string literal key type that allowed strings that weren't "path" or "name", but it would be very complicated (and probably slow to compile) even if it's possible.

Instead, either use a simpler string literal key type via a prefix (or suffix, or some other simple pattern that doesn't match "path" or "name") on children like this, which is fairly similar to what you had, just slightly less open:

type IPath = {
    path: string;
    name: string;
    [key: `child${string}`]: IPath;
};

const example: IPath = {
    path: "/something",
    name: "something",
    childX: {
        path: "/something/else",
        name: "something-else",
    },
    childY: {
        path: "/some/third/thing",
        name: "some third thing",
    },
};

Playground link

...or use a property that's an array of children instead — this is the approach I'd take:

interface IPath {
    path: string;
    name: string;
    children?: IPath[];
}

const example: IPath = {
    path: "/something",
    name: "something",
    children: [
        {
            path: "/something/else",
            name: "something-else",
        },
        {
            path: "/some/third/thing",
            name: "some third thing",
        },
    ],
};

Playground link