import type { MetadataEntry, MetadataCollection } from '../metadata';
import { MetadataType } from '../metadata';
/**
 * Adds platform discriminator to metadata entries received from native code.
 *
 * Native code doesn't include the platform field to avoid redundancy with `Platform.OS`.
 * This utility injects the platform field based on the current platform, enabling
 * TypeScript discriminated union type narrowing for platform-specific metadata structures.
 *
 * @param collection - Metadata collection from native code without platform discriminators
 * @returns Metadata collection with platform field added to each entry
 */
export declare function addPlatformToMetadata<T extends MetadataEntry>(collection: Omit<MetadataCollection<T>, 'entries'> & {
    entries: Omit<T, 'platform'>[];
}): MetadataCollection<T>;
/**
 * Adds the platform discriminator to metadata-carrying events when needed.
 *
 * Native payloads omit the platform field; this helper enriches only metadata
 * events that require platform-specific discriminators (ID3 and DATERANGE).
 */
export declare function addPlatformToMetadataEvent<TEvent extends {
    metadataType?: MetadataType;
    metadata?: MetadataCollection<MetadataEntry>;
}>(event: TEvent): TEvent;
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