utils.d.ts

declare global {
    type KeysMatching<T, V> = {
        [K in keyof T]-?: T[K] extends V ? K : never;
    }[keyof T];

    type DeepPartial<T> = T extends string | number | bigint | boolean | null | undefined | symbol | Date
        ? T | undefined
        : T extends Array<infer ArrayType>
        ? Array<DeepPartial<ArrayType>>
        : T extends ReadonlyArray<infer ArrayType>
        ? ReadonlyArray<ArrayType>
        : T extends Set<infer SetType>
        ? Set<DeepPartial<SetType>>
        : T extends ReadonlySet<infer SetType>
        ? ReadonlySet<SetType>
        : T extends Map<infer KeyType, infer ValueType>
        ? Map<DeepPartial<KeyType>, DeepPartial<ValueType>>
        : T extends ReadonlyMap<infer KeyType, infer ValueType>
        ? ReadonlyMap<DeepPartial<KeyType>, DeepPartial<ValueType>>
        : { [K in keyof T]?: DeepPartial<T[K]> };
}

export {};