export type LazyBundleMode = 'sync' | 'async';
/**
 * Load dynamic component from source. Designed to be used with `lazy`.
 *
 * The `mode` is threaded in by the chunk-loading runtime from the
 * `import(..., { with: { mode } })` import attribute (see `lynx_acm`), so each
 * lazy import carries its own mode instead of relying on shared mutable state.
 * @param source - where dynamic component template.js locates
 * @param mode - `'sync'` (first-screen blocking) or `'async'` (default)
 * @returns
 * @public
 */
export declare const loadLazyBundle: <T extends {
    default: React.ComponentType<any>;
}>(source: string, mode?: LazyBundleMode, host?: string) => Promise<T>;