/**
 * Enforces the two `data_visualization` rules Slack applies at runtime that
 * JSON Schema can't express, because each depends on the values of sibling
 * fields:
 *
 *   1. **Unique series names** — every series in a chart must have a distinct
 *      `name`.
 *   2. **Label ↔ category matching** — each series must contain exactly one
 *      data point for every label in `axis_config.categories`, and no data
 *      point may use a label outside `categories`.
 *
 * Only cartesian (line/bar/area) charts have `series` + `axis_config`; pie
 * charts (segments only) carry no categories and are skipped. Structurally
 * malformed charts are skipped too — the schema reports those.
 *
 * @param blocks - array of Block Kit blocks
 * @returns array of error messages (empty when every chart is internally consistent)
 */
export declare function checkDataVisualizationConsistency(blocks: readonly {
    type?: string;
}[]): string[];
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