import opentype from 'opentype.js';
import { GlyphCache } from './glyphEncoder';
/**
 * Returns true when `getFont(family, weight, italic)` fell back to Inter
 * because the requested font couldn't be loaded from fontsource.
 */
export declare function wasSubstituted(family: string, weight: number, italic: boolean): boolean;
export declare function getFont(family: string, weight: number, italic: boolean): Promise<{
    font: opentype.Font;
    cache: GlyphCache;
} | null>;
export declare function getFontSync(family: string, weight: number, italic: boolean): {
    font: opentype.Font;
    cache: GlyphCache;
} | null;
export declare function preloadFonts(descriptors: Array<{
    family: string;
    weight: number;
    italic: boolean;
}>): Promise<void>;
export declare function collectFontNeeds(root: Element): Array<{
    family: string;
    weight: number;
    italic: boolean;
}>;