export type ChunkingStrategy = 'fixed' | 'overlap' | 'sentence' | 'paragraph' | 'markdown-heading' | 'semantic' | 'recursive';
export interface ChunkOpts {
    strategy: ChunkingStrategy;
    chunkSize?: number;
    overlap?: number;
    separators?: string[];
}
export interface Chunk {
    index: number;
    text: string;
    tokenEstimate: number;
    startChar: number;
    endChar: number;
    heading?: string;
}
export declare function estimateTokens(text: string): number;
export declare function chunkContent(text: string, opts: ChunkOpts): Chunk[];
export declare function mergeSmallChunks(chunks: Chunk[], minTokens: number): Chunk[];