import { LayoutBlockProps } from './utils';
export interface FileProps extends LayoutBlockProps {
    children?: never;
    /** A string of external unique ID for the remote file to show. */
    externalId: string;
    /**
     * Override `source` field.
     *
     * At the moment, you should not take care of this because only the default
     * value `remote` is available in Slack.
     */
    source?: string;
}
/**
 * [The `file` layout block](https://api.slack.com/reference/messaging/blocks#file)
 * to display a remote file.
 *
 * _This component is available only in `<Blocks>` container for messaging._
 *
 * Learn about [adding remote files](https://api.slack.com/messaging/files/remote)
 * in the document of Slack API.
 *
 * @return The partial JSON for `file` layout block
 */
export declare const File: import("../../jsx-internals").BuiltInComponent<FileProps>;