import type { CmcdData } from './CmcdData.js';
import { CmcdHeaderField } from './CmcdHeaderField.js';
import type { CmcdHeaderMap } from './CmcdHeaderMap.js';
/**
 * Group a CMCD data object into header shards
 *
 * @param cmcd - The CMCD data object to convert.
 * @param customHeaderMap - A map of CMCD header fields to custom CMCD keys.
 *
 * @returns The CMCD header shards.
 *
 * @group CMCD
 *
 * @beta
 */
export declare function groupCmcdHeaders(cmcd: CmcdData, customHeaderMap?: Partial<CmcdHeaderMap>): Record<CmcdHeaderField, CmcdData>;
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