/**
 * Surfaces where Block Kit payloads are rendered. Each has a different set of
 * blocks/elements it accepts.
 */
export type Surface = "message" | "modal" | "home";
/**
 * Reports any blocks whose type is not allowed on the given surface. Slack's
 * surface compatibility matrix is documented at
 * https://docs.slack.dev/surfaces/. Element-level restrictions (e.g. `file_input`
 * only valid in modals) are checked here by looking at each input block's inner
 * `element.type`.
 * @param blocks - array of Block Kit blocks
 * @param surface - target surface
 * @returns array of error messages (empty when all blocks are surface-compatible)
 */
export declare function checkSurfaceCompatibility(blocks: readonly {
    type?: string;
    element?: {
        type?: string;
    };
}[], surface: Surface): string[];
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