export type UnicodeFontNeeds = {
    japanese: boolean;
    arabic: boolean;
};
export declare function detectUnicodeFontNeeds(values: Iterable<string>): UnicodeFontNeeds;
/**
 * Load large script-specific font manifests only when visible workspace content
 * needs them. Fontsource splits the actual glyphs by unicode-range, so Chromium
 * then fetches only the small shards used by the path instead of charging every
 * Latin-only session for the complete font.
 */
export declare function useUnicodeFallbackFonts(values: readonly string[]): void;