export interface D2Instance {
    D2?: D2Constructor;
    compile?: (source: string, options?: Record<string, unknown>) => Promise<unknown> | unknown;
    render?: (input: unknown, options?: Record<string, unknown>) => Promise<unknown> | unknown;
}
export interface D2Constructor {
    new (): D2Instance;
    D2?: D2Constructor;
    compile?: D2Instance['compile'];
}
export type D2Module = D2Constructor | D2Instance;
export type D2Loader = () => Promise<unknown> | unknown;
export declare function setD2Loader(loader: D2Loader | null): void;
export declare function enableD2(loader?: D2Loader): void;
export declare function disableD2(): void;
export declare function isD2Enabled(): boolean;
export declare function getD2(): Promise<D2Module | null>;