import { BackwardMatch } from './match';
import { Command } from './command';
import { SimpleHasher } from './hash-simple';
import { HashChainHasher } from './hash-chains';
import { BinaryTreeHasher } from './hash-binary-tree';
export type Hasher = SimpleHasher | HashChainHasher | BinaryTreeHasher;
export declare function createBackwardReferences(numBytes: number, position: number, ringbuffer: Uint8Array, ringbufferMask: number, hasher: SimpleHasher | HashChainHasher, distCache: Int32Array, lastInsertLen: number, _quality: number, npostfix?: number, ndirect?: number): [Command[], number, number];
export declare function distanceToCode(distance: number, distCache: Int32Array): number;
export declare function backwardMatchLength(match: BackwardMatch): number;
export declare function backwardMatchLengthCode(match: BackwardMatch): number;
export declare function initBackwardMatch(distance: number, length: number): BackwardMatch;
export declare function initDictionaryBackwardMatch(distance: number, length: number, lenCodeDelta: number): BackwardMatch;
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