export interface SlackMessageTextInput {
    blocks?: unknown;
    text?: string;
}
export declare function slackVisibleMessageText(input: SlackMessageTextInput): string | undefined;
/**
 * Apply blocks→visible text before routing/decide so mention detection and the
 * final inbox item share one canonical representation. No Slack API fetch.
 */
export declare function withCanonicalSlackVisibleText<T extends SlackMessageTextInput>(input: T): T;
/**
 * True when the event **addresses** `userId` as a Slack mention entity.
 *
 * 1. Scan blocks per protocol: `rich_text` → `user` entities; mrkdwn sources →
 *    `<@U…>` tokens outside code (`markdown` blocks + nested `{ type: "mrkdwn" }`).
 * 2. If blocks produced any visible structured text and no structured mention was
 *    found, return false — never regex the canonical rendering (covers plain_text
 *    section/header, rich_text literals, image alt, future structured types).
 * 3. Scan top-level fallback only when blocks supplied no renderable body
 *    (e.g. actions/controls-only).
 */
export declare function slackEventMentionsUserId(input: SlackMessageTextInput, userId: string | undefined): boolean;
/** Mention tokens in mrkdwn outside inline/fenced code (`<@U…>` only). */
export declare function slackTextMentionsUserId(text: string | undefined, userId: string | undefined): boolean;
export declare function slackMessageTextFromBlocks(blocks: unknown): string | undefined;
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