/**
 * The box of a task-list item (`- [ ]`, `- [x]`) as the engine draws it
 * (#765). Up to postext 1.28 the box was the character ☐ (☑ when ticked)
 * set in the list's face; no text face holds it, so the browser took it
 * from a font of the system and the PDF from whatever the face answered,
 * and its width, which the item's text starts after, was another on every
 * machine. The engine now draws it: a square outline, with a tick when
 * the item is done, the same on the canvas, in the PDF, in the HTML and in
 * the EPUB, and its room is worked out with no font.
 *
 * The square's side is {@link TASK_BOX_SIDE_EM} of the marker's size (the
 * list level's `fontSize`) and that is all the room it takes: the list's
 * `gap` comes after it. It is centred on the marker's `bulletY`, as a
 * bullet is, so at the text's own size it stands on the first line's
 * baseline. Its outline is drawn inside the square, as heavy as the
 * level's `fontWeight` asks ({@link taskBoxSize}); the tick has the same
 * stroke, with round ends.
 */
/** The side of the box, in ems of the marker's size. */
export declare const TASK_BOX_SIDE_EM = 0.6;
/** The tick of a ticked box: its three points in units of the side, from
 *  the box's top left corner, y down. */
export declare const TASK_BOX_TICK: ReadonlyArray<readonly [number, number]>;
/** The side and the stroke (px) of the box of a marker `markerSizePx`
 *  large in a level of weight `fontWeight`: the stroke is a tenth of the
 *  side at 700, the default weight of a bullet, lighter and heavier with
 *  the weight, and never under a twentieth. */
export declare function taskBoxSize(markerSizePx: number, fontWeight: number): {
    side: number;
    stroke: number;
};
/** Whether a task item's box is drawn: `char`, the character the list
 *  settings give its state, is the default one (☐, or ☑ when `checked`).
 *  Any other character is the author's own and is set as text. */
export declare function isDrawnTaskBox(char: string, checked: boolean): boolean;
/** The character a drawn box stands for: what assistive technology reads
 *  and a copy takes. */
export declare function taskBoxText(checked: boolean): string;
/**
 * The tick's points (px) from the centre of a box of `side`, in the axes
 * of the flow it is painted in, y down. A tick reads the same on every
 * page, so in a flow the sheet shows turned or mirrored its points are
 * turned or mirrored back: `'vertical'` for the flow of a vertical page
 * (a quarter turn clockwise on the sheet), `'mirrored'` for the flow of a
 * right-to-left page (turned over the sheet's vertical axis).
 */
export declare function taskBoxTick(side: number, flow?: 'vertical' | 'mirrored'): Array<[number, number]>;
/**
 * The box as the content of an `<svg viewBox="0 0 100 100">`, painted in
 * `currentColor`: the outline inside the square and, when `checked`, the
 * tick. `strokeRatio` is the stroke over the side; `flow` as in
 * {@link taskBoxTick}.
 */
export declare function taskBoxSvgBody(strokeRatio: number, checked: boolean, flow?: 'vertical' | 'mirrored'): string;
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