/** Stable identity tuple used for provider-side deduplication. */
export type IdempotencyKeyTuple = {
    workflowId: string;
    revisionId: string;
    runId: string;
    nodeId: string;
    attemptId: string;
};
export type DeriveIdempotencyKeyOptions = {
    namespace?: string;
    maxLength?: number;
};
/**
 * Deterministically derive the provider key from the canonical tuple.
 * Keep this byte-for-byte compatible with the former v2 events helper:
 * persisted provider keys must remain valid across the v2 retirement.
 */
export declare function deriveIdempotencyKey(tuple: IdempotencyKeyTuple, opts?: DeriveIdempotencyKeyOptions): string;
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