/**
 * Methods for splitting text into chunks for embedding generation.
 */
export type ChunkingMethod = "PlainTextSplit" | "PlainTextSplitLines" | "PlainTextSplitParagraphs" | "MarkDownSplitLines" | "MarkDownSplitParagraphs" | "HtmlStrip";
/**
 * Configuration for chunking text into smaller pieces for embedding generation.
 */
export interface ChunkingOptions {
    /**
     * The method to use for splitting text into chunks.
     */
    chunkingMethod: ChunkingMethod;
    /**
     * Maximum number of tokens per chunk.
     * @default 512
     */
    maxTokensPerChunk: number;
    /**
     * Number of tokens to overlap between consecutive chunks.
     * Only supported for MarkDownSplitParagraphs and PlainTextSplitParagraphs.
     * @default 0
     */
    overlapTokens: number;
}
/**
 * Chunking methods that support overlap tokens.
 */
export declare const METHODS_SUPPORTING_OVERLAP_TOKENS: ChunkingMethod[];
/**
 * Validates chunking options and returns an array of error messages.
 * @param options The chunking options to validate
 * @param source The source/context of the validation (e.g., field name) for better error messages
 * @returns Array of validation error messages, empty if valid
 */
export declare function validateChunkingOptions(source: string, options: ChunkingOptions): string[];
/**
 * Compares two ChunkingOptions for equality.
 * @param left First chunking options to compare
 * @param right Second chunking options to compare
 * @returns true if both are equal or both are null/undefined, false otherwise
 */
export declare function areChunkingOptionsEqual(left: ChunkingOptions, right: ChunkingOptions): boolean;
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