/**
 * Font Manager
 * ------------
 * Provides programmatic font registration and integrates with typography
 * design tokens to keep the document font-face list in sync.
 */
export type FontDisplayStrategy = 'auto' | 'block' | 'swap' | 'fallback' | 'optional';
export interface FontVariantDescriptor {
    src: string;
    weight?: string | number;
    style?: 'normal' | 'italic' | 'oblique';
    display?: FontDisplayStrategy;
    unicodeRange?: string;
    stretch?: string;
    variationAxes?: Record<string, number>;
}
export interface FontFamilyConfig {
    family: string;
    fallbacks?: string[];
    variants: FontVariantDescriptor[];
}
export declare class FontManager {
    private documentRef;
    constructor(documentRef?: Document | undefined);
    /**
     * Registers a font family configuration. If executed in the browser, this
     * method loads all declared variants and adds them to `document.fonts`.
     */
    register(config: FontFamilyConfig): Promise<void>;
    /**
     * Reveals all registered families (including those sourced from tokens).
     */
    listFamilies(): FontFamilyConfig[];
    /**
     * Loads a single font variant. Calls are deduplicated via an internal cache.
     */
    loadVariant(family: string, variant: FontVariantDescriptor): Promise<void>;
    /**
     * Derives a CSS `font-family` declaration combining the primary family and
     * any declared fallbacks.
     */
    static toFontStack(config: FontFamilyConfig): string;
    private createFontFace;
    private attachTokenListener;
}
export declare function detachFontTokenListener(): void;
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