/**
 * `:::index` — the back-of-book index (#165). The directive expands, before
 * layout, into ordinary content blocks, one per entry, that flow through
 * the column machinery like paragraphs (the contents do the same, see
 * `toc.ts`). The entries come from the index marks of the book's outline
 * (`OutlineEntry.indexMark`), each with the page it landed on: grouped by
 * term and sub-term, sorted in the document language's alphabetical order,
 * their pages merged into ranges. An entry that opens a new letter carries
 * the letter head in its own block, so a head never ends a column alone.
 */
import type { ContentBlock } from '../parse/index.js';
import type { OutlineEntry } from '../types.js';
import type { ContentWarning, ResolvedConfig, VDTDocument } from '../vdt.js';
import type { BlockMeasureContext, MeasuredContentBlock } from './measureContentBlock.js';
/** The locale the index sorts in: its own, else the document's. */
export declare function indexLocale(resolved: ResolvedConfig): string;
/** The second number of a range, as `format` writes it: `'chicago'` drops
 *  the digits it shares with the first (Chicago 9.64: 71–72, 100–104,
 *  101–8, 321–28, 498–532, 1087–89, 1496–500). Labels that are not plain
 *  numbers are kept whole. */
export declare function rangeEnd(fromLabel: string, toLabel: string, format: 'full' | 'chicago'): string;
/** The content blocks with every `:::index` directive replaced by the
 *  entries it prints, and the warnings the index raised. Without an
 *  outline (no directive) the input is returned as is. */
export declare function expandIndexDirectives(blocks: readonly ContentBlock[], outline: readonly OutlineEntry[] | undefined, resolved: ResolvedConfig): {
    blocks: ContentBlock[];
    warnings: ContentWarning[];
};
/** Measure one block of an expanded `:::index` (see the module header). */
export declare function measureIndexBlock(rawBlock: ContentBlock, columnWidth: number, ctx: BlockMeasureContext): MeasuredContentBlock | null;
/**
 * The page of each index mark of `blocks` (the parsed markdown body) in the
 * laid-out `doc`: the page of the line holding the character the mark is
 * attached to (`IndexMark.anchor`), found by the lines' source ranges.
 * When no line holds it (the character set by a design, not a line), the
 * mark takes the nearest line before it (`attach: 'before'`) or after it.
 * Undefined when the document has no marks.
 */
export declare function locateIndexMarks(doc: VDTDocument, blocks: readonly ContentBlock[], bodyOffset: number): {
    sourceStart: number;
    pageIndex: number;
}[] | undefined;
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