/**
 * Slack allows at most one interactive element with `focus_on_load: true` per
 * view/payload. The walker recursively descends into every nested object and
 * array and counts any node whose `focus_on_load` is literally `true` — it
 * doesn't gate on element type, so for well-formed payloads this is
 * equivalent to "one focused element per view." The walk is depth-limited so
 * pathological inputs can't blow the stack.
 * @param blocks - array of Block Kit blocks or anything with a nested shape
 * @returns array of error messages (empty when zero or one node has `focus_on_load: true`)
 */
export declare function checkFocusOnLoadUniqueness(blocks: readonly unknown[]): string[];
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