export declare function isRecord(value: unknown): value is Record<string, unknown>;
export type MapKeysCallback<PreviousKey extends PropertyKey, Value, NewKey extends PropertyKey> = (key: PreviousKey, value: Value) => NewKey;
export declare function mapKeys<K extends PropertyKey, V, Key extends PropertyKey>(object: Record<K, V>, callback: MapKeysCallback<K, V, Key>): Record<Key, V>;
export type MapValuesCallback<Key extends PropertyKey, PreviousValue, NewValue> = (key: Key, value: PreviousValue) => NewValue;
export declare function mapValues<Key extends PropertyKey, PreviousValue, NewValue>(object: Record<Key, PreviousValue>, callback: MapValuesCallback<Key, PreviousValue, NewValue>): Record<Key, NewValue>;
export type MapEntriesCallback<PreviousKey extends PropertyKey, PreviousValue, NewKey extends PropertyKey, NewValue> = (key: PreviousKey, value: PreviousValue) => [NewKey, NewValue];
export declare function mapEntries<PreviousKey extends PropertyKey, PreviousValue, NewKey extends PropertyKey, NewValue>(object: Partial<Record<PreviousKey, PreviousValue>>, callback: MapEntriesCallback<PreviousKey, PreviousValue, NewKey, NewValue>): Partial<Record<NewKey, NewValue>>;