/** The room between a Latin reading's descenders and its base's em box,
 *  in em of the text (the gap zhuyin keeps from its character). */
export declare const LATIN_RUBY_GAP_EM = 0.04;
/**
 * How far (px, towards the reading's side) a reading over its base moves
 * away from the base: 0 for a reading with no Latin letter, when the
 * measurer gives no ink box, or when the face's descenders already stay in
 * the reading's own em box with the gap to spare.
 */
export declare function latinReadingLift(reading: string, fontString: string, em: number): number;
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