import { DEFAULT_CHUNKING_CONFIG } from '../constants/rag/index.js';
import type { ChunkContent, Chunker, ChunkingConfig } from '../types/rag/index.js';
export declare class TextChunker implements Chunker {
    chunk(content: string, config: ChunkingConfig): ChunkContent[];
    private fixedChunk;
    private sentenceChunk;
    private paragraphChunk;
    private recursiveChunk;
    private recursiveSplit;
    private splitBySeparators;
    private mergeSmallParts;
}
export { DEFAULT_CHUNKING_CONFIG };
/**
 * Split on `sep` but keep each separator attached to the piece it ended.
 *
 * `String.prototype.split` discards the separator, which silently rewrites
 * the text: a document split on '. ' comes back with its sentence-ending
 * periods gone, and one split on '\n\n' loses every paragraph break. For a
 * retrieval chunk that is a correctness problem, not a cosmetic one — the
 * chunk shown to the model is no longer what the source said.
 *
 * Concatenating the result reproduces the input exactly.
 */
export declare function splitKeepingSeparator(text: string, sep: string): string[];
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