/**
 * @license
 * Copyright 2023 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * Renders the shadow contents of the provided custom element type with props.
 * Should only be called in server environments.
 */
export declare const renderCustomElement: (tagName: string, props: {} | null) => {
    shadowContents: import("@lit-labs/ssr").RenderResult | undefined;
    elementAttributes: {
        [attributeName: string]: string;
    };
    templateAttributes: {
        shadowrootdelegatesfocus?: string | undefined;
        shadowroot: ShadowRootMode;
        shadowrootmode: ShadowRootMode;
    };
};
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