/**
 * Card → Slack Block Kit converter.
 *
 * The chat SDK's Slack adapter used to walk the cross-platform
 * `CardElement` AST (the data shape produced by `Card({...})`,
 * `Actions([...])`, `Button({...})`, etc.) and emit Slack Block Kit
 * JSON for `chat.postMessage`. We replicate just that conversion here
 * so authors can keep using the ergonomic card builders without the
 * `@chat-adapter/slack` runtime.
 *
 * Supported shapes:
 *   Card                  → header + context + image header + children blocks
 *   TextElement           → `section`/`context` (style: plain | bold | muted)
 *   ImageElement          → `image` block
 *   DividerElement        → `divider`
 *   ActionsElement        → `actions` with buttons / link buttons /
 *                           static_select / radio_buttons
 *   SectionElement        → recurses into a sequence of blocks
 *   FieldsElement         → `section` with fields
 *   LinkElement           → `section` with a `<url|label>` mrkdwn
 *   TableElement          → `section` with a mrkdwn approximation
 *   ButtonElement         → `button` action element
 *   LinkButtonElement     → `button` action element with `url`
 *
 * Anything else falls back to the chat SDK's
 * `cardChildToFallbackText` (a string description) wrapped in a
 * section block so the message is never silently dropped.
 */
import { type CardElement } from "#compiled/chat/index.js";
/**
 * One Slack Block Kit block. Slack accepts a wide enum and adds new
 * block types over time, so this type stays open-ended.
 */
export type BlockKitBlock = Record<string, unknown>;
/**
 * Converts a {@link CardElement} into a list of Slack Block Kit blocks
 * ready to pass to `chat.postMessage`'s `blocks` parameter.
 */
export declare function cardToBlocks(card: CardElement): BlockKitBlock[];
/**
 * Best-effort fallback text for a card. `chat.postMessage` sends this
 * as the `text` field so notifications and accessibility readers still
 * see something meaningful.
 */
export declare function cardToFallbackText(card: CardElement): string;