/**
 * Pure text-shaped step implementations: chunking, plain-text extraction, text diff/patch,
 * and the text-mode redact/update_text paths.
 *
 * @remarks
 * Internal sibling of the `@nhtio/adk/batteries/media` entry. The split functions are ported
 * verbatim from the source server's `chunk_text` adapter (its green unit suite ports with
 * them). All implementations here operate on in-memory bytes and run in any environment.
 */
import type { StepImpl } from "../runtime";
/** One text chunk with its position in the source. */
export interface Chunk {
    index: number;
    text: string;
    char_start: number;
    char_end: number;
}
/** Split text on double-newline paragraph boundaries, with optional character overlap. */
export declare const splitParagraph: (text: string, overlap: number) => Chunk[];
/** Split text on sentence-ending punctuation, with optional character overlap. */
export declare const splitSentence: (text: string, overlap: number) => Chunk[];
/** Split text into fixed-size character windows with optional overlap. */
export declare const splitFixed: (text: string, chunkSize: number, overlap: number) => Chunk[];
export { decodeText } from "../../../lib/text/decode_text";
/** `chunk` — split text content into retrieval chunks (data result). */
export declare const chunkStep: StepImpl;
/**
 * `extract.text` — Phase 0 covers the native-text path (txt/md/csv/json/html). Document
 * formats (pdf/docx/…) and OCR routes are added by later phases; until then they fail with a
 * clear reason.
 */
export declare const extractTextStep: StepImpl;
/** `extract.metadata` — Phase 0: size/MIME/filename basics (format-aware fields come later). */
export declare const extractMetadataStep: StepImpl;
/** `redact` — Phase 0: the text-media path. Document-format in-place redaction lands later. */
export declare const redactStep: StepImpl;
/** `update_text` — Phase 0: the text-media path. */
export declare const updateTextStep: StepImpl;
/** `diff` — compare against another media (text-comparable formats in Phase 0). */
export declare const diffStep: StepImpl;
/**
 * `apply_patch` — apply a unified diff, or a structured `*** Begin Patch` envelope
 * (multi-file Add/Delete/Update/Move — the GitHub Copilot apply_patch dialect).
 */
export declare const applyPatchStep: StepImpl;