/**
 * A memo of the box typesetter's measurements for one layout of a composed
 * page (#953).
 *
 * The reflow ladder (#858) lays the page again at every step, and the
 * frames that did not change set the same paragraphs at the same widths
 * each time (most `measureContentBlock` calls of a ladder repeat an earlier
 * one). A memo made for one `layoutComposedPage` run, and dropped with it,
 * answers the repeats. It lives only as long as the run because what a
 * measurement reads besides its arguments (the boxes that left the flow, a
 * block's numbers) is fixed for the run and may change before the next one.
 */
import type { ContentBlock } from '../parse/index.js';
import type { ResolvedCalloutStyleConfig } from '../types.js';
import { type BlockMeasureContext, type DropCapNote, type MeasureContentBlockOptions, type MeasuredContentBlock } from './measureContentBlock.js';
interface MemoEntry {
    result: MeasuredContentBlock | null;
    /** The drop cap note the measurement left for the block, if any (it
     *  writes the notes of its context as a side effect). */
    note: DropCapNote | undefined;
    /** The measurement marked the block as set without letter-spacing. */
    joined: boolean;
}
export interface MeasureMemo {
    readonly ids: WeakMap<object, number>;
    next: number;
    readonly entries: Map<string, MemoEntry>;
}
export declare function createMeasureMemo(): MeasureMemo;
/** What the measuring code reads of the module state besides its
 *  arguments: writing mode, region, upright digits, direction, Arabic
 *  numerals and language. */
export declare const measureStateKey: () => string;
export declare const idOf: (memo: {
    readonly ids: WeakMap<object, number>;
    next: number;
}, o: object | undefined) => number;
/** `measureContentBlock(raw, blockIdx, width, derived, { styleOverride })`
 *  for a box of `style` whose children are measured in `ctx` (`derived` is
 *  `ctx` with the box's typography), remembered in `memo`. What the box's
 *  typography changes in the measurement is its `body` and `lists`
 *  (`deriveCalloutResolvedConfig`), which the styles a frame derives from
 *  one style share by identity. A figure or table is laid out afresh: its
 *  result is placed by moving it, so it is not kept. */
export declare function measureBlockMemo(memo: MeasureMemo, ctx: BlockMeasureContext, style: ResolvedCalloutStyleConfig, derived: BlockMeasureContext, raw: ContentBlock, blockIdx: number, width: number, styleOverride: MeasureContentBlockOptions['styleOverride']): MeasuredContentBlock | null;
export {};
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