import type { NormalizedFontMetrics } from './font-face-types/TrFontFace.js';
/**
 * Calculate the default line height given normalized font metrics
 *
 * @remarks
 * This method may be used for both the WebTrFontFace and SdfTrFontFace font types.
 *
 * @param metrics
 * @param fontSize
 * @returns
 */
export declare function calcDefaultLineHeight(metrics: NormalizedFontMetrics, fontSize: number): number;