Map Index Values in typescript

index.ts

export function mapIndexValues<Key extends string | number | symbol, ValueInput, ValueOutput>(
    input: Record<Key, ValueInput>,
    iteratee: (key: Key, val: ValueInput, index: number) => ValueOutput
): Record<Key, ValueOutput> {
    const entries = Object.entries(input).map(([key, value], index) => [
        key,
        iteratee(key as Key, value as ValueInput, index)
    ]);

    return Object.fromEntries(entries);
}