/**
 * Where shaped lines came from: each line of a shaped (or scored) text matched to the line of the original it is,
 * so per-line scores and the kept/hidden split can be reported over the original's own lines.
 */
/** Each distinct line of `base` and its indexes, ascending. */
export declare function lineIndex(base: readonly string[]): Map<string, number[]>;
/**
 * The first index at or after `from` of the `base` line that `line` is: equal to it, or capped from it. -1 for none.
 * `index` is {@link lineIndex} of `base`.
 */
export declare function matchLine(base: readonly string[], index: Map<string, number[]>, line: string, from: number): number;
/**
 * The index in `base` of each of `lines`, matched in order (each match after the previous one), or null for a line
 * that is none of them (a marker, a note, a rewritten line). Shaping only drops and replaces runs of lines, so the
 * nearest equal line after the last match is the one a kept line was copied from.
 */
export declare function alignLines(base: readonly string[], lines: readonly string[], index?: Map<string, number[]>): (number | null)[];