import { Anything, Extra, ImmutableObject, Key, ReduceCallback } from './types';
declare function reduce<V, K extends Key, E extends Extra, R = Anything, TH = Anything>(this: TH, object: ImmutableObject<K, V>, callback: ReduceCallback<V, K, E, TH, R>, initial: R, ...extra: E): R;
declare function reduce<V, K extends Key, R = Anything, TH = Anything>(this: TH, object: ImmutableObject<K, V>, callback: ReduceCallback<V, K, Extra, TH, R>, initial: R, ...extra: Extra): R;
declare function reduce<V, K extends Key, E extends Extra, R = Anything, TH = Anything>(this: TH, object: ImmutableObject<K, V>, callback: ReduceCallback<V, K, E, TH, R>, initial?: R, ...extra: E): R | undefined;
declare function reduce<V, K extends Key, R = Anything, TH = Anything>(this: TH, object: ImmutableObject<K, V>, callback: ReduceCallback<V, K, Extra, TH, R>, initial?: R, ...extra: Extra): R | undefined;
export default reduce;
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