Type Alias RemoveIndex<T>

RemoveIndex: Simplify<
    {
        [K in keyof T as string extends K
            ? never
            : number extends K ? never : symbol extends K ? never : K]: T[K]
    },
>

Strips index signatures ([K: string], [K: number], [K: symbol]) from an object type, keeping only explicitly-named keys. Useful when a type flows through a constraint like Record<string, V> which adds an implicit index.