/**
 * @file getKey.ts
 * @input Receives an optional id key and required fallback key
 * @output Exports getKey for stable React list keys
 * @position Shared utility; consumed by components that render keyed lists
 */
export type Key = string | number;
export type KeyFallback = Key | (() => Key);
export declare function getKey(idKey: Key | null | undefined, fallback: KeyFallback): string;
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