deepCompare.ts

const sources = {
    repo: {
        title: "hola",
        count: 3,
    },
    editing: {
        isDirty: false,
    },
}

type Sources = typeof sources;

function deepCompare<KSource extends keyof Sources, KName extends keyof Sources[KSource], T>(
    key: KSource,
    name: KName,
    value: Sources[KSource][KName],
) {
    return sources[key][name] === value;
}

// This should return a type error: "3 is not a string"
deepCompare("repo", "title", 3);

// But I'm getting "title" is not assignable to type 'never'

I am getting the correct error. Saying "Argument of type '3' is not assignable to parameter of type 'string'".
Can it be related to the version of Typescript? I am using the 2.1 version from Typescript for Visual Studio.