/**
 * Checks the cumulative character length across all `markdown` blocks in a
 * payload. Slack caps it at 12,000 chars per payload; the schema's per-block
 * `maxLength` can't express this across siblings.
 * @param blocks - array of Block Kit blocks
 * @returns array of error messages (empty when under the limit)
 */
export declare function checkCumulativeMarkdownLength(blocks: readonly {
    type?: string;
    text?: string;
}[]): string[];
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