/**
 * @description Abstract stream processor that buffers ("stashes") consecutive
 * items matching a predicate before flushing them as a group. Subclasses
 * implement `shouldStash`, `doMatchesStash`, and `doFlushStash` to define what
 * constitutes a run. Used by `WordDetectionStream` in `LineConverter` (grouping
 * same-format text spans) and `VerticalsStream` in `VerticalToHorizontal`
 * (merging single-character vertical lines into one horizontal line).
 */
export default class StashingStream {
    results: any[];
    stash: any[];
    constructor();
    consumeAll(items: any[]): void;
    consume(item: any): void;
    pushOnStash(item: any): void;
    complete(): any[];
    matchesStash(item: any): boolean;
    flushStash(): void;
    onPushOnStash(item: any): void;
    shouldStash(item: any): boolean;
    doMatchesStash(lastItem: any, item: any): boolean;
    doFlushStash(stash: any[], results: any[]): void;
}