import { FontId, FontStack } from './types';
export declare const FONT_STACKS: Record<FontId, FontStack>;
/**
 * Idempotent injector for a Google Fonts `<link>` tag. Safe to call repeatedly
 * with the same `spec` — returns early if a `<link id="cm-gfont-${spec}">`
 * already exists. Returns early in non-DOM environments (SSR-safe).
 */
export declare function ensureGoogleFont(spec: string | null): void;
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