/**
 * Leaders: a character (or a short text) repeated over a room, flush with
 * the room's end so the leaders of several lines line up. The contents'
 * rows (`pipeline/toc.ts`) and the tab stops of body text (#622,
 * `measure/tabs.ts`) both fit theirs here.
 */
/** Fewest repeats a leader is set with (#666): one dot between a title
 *  and its page number reads as a full stop, two as a slip. A room for
 *  fewer is left empty. */
export declare const MIN_LEADER_REPEATS = 3;
/**
 * The leader run for `room` px: `char` repeated as often as one repeat's
 * width allows, or fewer times when the run, measured as a whole, is wider
 * than the room. A face may kern the character against itself: Public Sans
 * 700 sets one full stop 6.74 px wide at 25 px and a run of thirty at 7.58
 * px a dot, and a leader counted from one dot then ran over the gap into
 * the page number (EF-148). `widthOf` measures a run as it is painted (the
 * leader's face, its tracking). Null when fewer than
 * {@link MIN_LEADER_REPEATS} fit.
 */
export declare function fitLeader(char: string, room: number, widthOf: (text: string) => number): {
    text: string;
    width: number;
} | null;
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