import { Anything, Extra, FilterCallback, ImmutableObject, Key } from './types';
declare function findKey<V, K extends Key, E extends Extra, TH = Anything>(this: TH, object: ImmutableObject<K, V>, callback: FilterCallback<V, K, E, TH>, ...extra: E): K | null;
declare function findKey<V, K extends Key, TH = Anything>(this: TH, object: ImmutableObject<K, V>, callback: FilterCallback<V, K, Extra, TH>, ...extra: Extra): K | null;
export default findKey;
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