import type { CmcdEvent } from './CmcdEvent.js';
/**
 * Check if a key is a valid CMCD event key.
 *
 * @param key - The key to check.
 *
 * @returns `true` if the key is a valid CMCD event key, `false` otherwise.
 *
 * @group CMCD
 *
 * @beta
 *
 * @example
 * {@includeCode ../../test/cmcd/isCmcdEventKey.test.ts#example}
 */
export declare function isCmcdEventKey(key: string): key is keyof CmcdEvent;
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