export interface PdfrxLocalFontsOptions {
    /** Search the conventional font directories for the current OS. Default: true. */
    systemDirectories?: boolean;
    /** Additional directories to search recursively. */
    directories?: readonly string[];
    /** Cache the font metadata index on disk. Default: true when `fontCache.directory` is set. */
    indexCache?: boolean;
}
export interface PdfrxFontCacheOptions {
    /** Directory used for the local-font metadata index and registered font data. */
    directory: string;
    /** Persist bytes supplied through `PdfrxEngine.addFontData`. Default: false. */
    persistRegisteredFonts?: boolean;
}
export declare function isServerRuntime(): boolean;
/** Conventional per-machine and per-user font directories. */
export declare function systemFontDirectories(): Promise<string[]>;
export declare class LocalFontManager {
    private readonly options;
    private readonly cache;
    private records;
    private persistQueue;
    constructor(options: PdfrxLocalFontsOptions, cache: PdfrxFontCacheOptions | undefined);
    loadRegistered(): Promise<Array<{
        face: string;
        data: Uint8Array;
        resolvedFace?: string;
    }>>;
    persistRegistered(face: string, data: Uint8Array, resolvedFace?: string): Promise<void>;
    private persistRegisteredNow;
    resolve(query: {
        face: string;
        weight: number;
        italic: boolean;
    }): Promise<{
        data: Uint8Array;
        resolvedFace: string;
    } | null>;
    private loadIndex;
}
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