/**
 * Line helpers shared by every shaping step: the normal form lines are compared in, the markers earlier shaping
 * writes, and the words lexical scores read.
 */
/** A line of earlier shaping (fold, gap, dump marker, note): cheap and says what is where, so never hidden or collapsed. */
export declare const MARKER: RegExp;
/** Lines shorter than this (normalised) are too generic to count as already seen, or as hidden by a cut. */
export declare const WITNESS_CHARS = 12;
/** Hidden lines shorter than this (normalised) are too generic to tell that the agent asks again. */
export declare const AGAIN_CHARS = 24;
/** A line without its `N:` / `cat -n` / `path:N:` prefix and surrounding blanks: the key lines are compared by. */
export declare function norm(line: string): string;
/** Key of normalised line `next` right after `prev` in one text: the order seen lines collapse in ({@link norm}). */
export declare function pairKey(prev: string, next: string): string;
/**
 * Lowercase words of `text` (`[a-z_][a-z0-9_]{3,}`) without the stop words, and its compound tokens (`gen:rpc`,
 * `index.ts`, `shard-3`) of at least 4 characters: a name made of short parts is still a name.
 */
export declare function words(text: string): Set<string>;
/** Identifiers of `text` (`[A-Za-z_$][\w$]*`), for "named in the conversation". */
export declare function identifiers(text: string): string[];
/** Leading whitespace of the first non-blank line of `lines` ("" when all are blank). */
export declare function indentOfFirst(lines: readonly string[]): string;