/**
 * Provides access to the core Wasm module of DsPdfJS.
 */
export declare class DsPdf {
    /**
     * The singleton instance of the {@link DsPdf} class.
     *
     * This static property holds the currently active instance of the {@link DsPdf} class.
     * It is null when no instance has been created yet or after the instance has been properly disposed.
     */
    static instance: DsPdf | null;
    /**
     * Checks and returns a valid {@link DsPdf} instance
     * @throws Error if no valid instance available
     */
    static checkDsPdf(): DsPdf;
    /**
     * Disposes the {@link DsPdf} instance.
     * @ignore
     **/
    dispose(): void;
    /**
     * Checks whether the DsPdf module is connected.
     **/
    get isConnected(): boolean;
    /**
     * Returns the current version of the DsPdf WASM API.
     *
     * @returns {string} The DsPdf WASM API version string, e.g. "9.1.0".
     */
    get version(): string;
    /**
     * Attempt to load the DsPdf module.
     * @returns A Promise that resolves to a boolean indicating whether the connection attempt was successful.
     * @ignore
     */
    connect(): Promise<boolean>;
    private getStringInternal;
    getPdfVariant(pData: number): number | string | boolean | number[] | null;
    setPdfVariant(value: number | string | boolean | number[] | null): void;
}