export declare const LEGACY_PROPERTY_KEY_USER = "user";
export declare const LEGACY_PROPERTY_KEY_CONTENT_OID = "content-oid";
export declare const LEGACY_PROPERTY_KEY_CONTENT_MIME = "content-mime";
export declare const LEGACY_PROPERTY_KEY_CONTENT_SIZE = "content-size";
export type LegacyPropertyKeyClassification = typeof LEGACY_PROPERTY_KEY_USER | typeof LEGACY_PROPERTY_KEY_CONTENT_OID | typeof LEGACY_PROPERTY_KEY_CONTENT_MIME | typeof LEGACY_PROPERTY_KEY_CONTENT_SIZE;
/** Classifies a legacy compatibility property key. */
export declare function classifyLegacyPropertyKey(value: string): LegacyPropertyKeyClassification;
/** Returns true when a classification belongs to legacy content metadata. */
export declare function isContentCompatibilityClassification(classification: LegacyPropertyKeyClassification): boolean;
/** Validates the shared legacy property key carrier. */
export declare function requireLegacyPropertyKeyValue(value: string, nounName: string): string;
