export type ProtocolMetadata = Record<string, unknown>;
export declare function getProtocolMetadata(metadata: ProtocolMetadata | null | undefined, namespace: string): ProtocolMetadata | undefined;
export declare function withProtocolMetadata(metadata: ProtocolMetadata | null | undefined, namespace: string, values: ProtocolMetadata): ProtocolMetadata;
export declare function withoutProtocolProjectionKeys(metadata: ProtocolMetadata | null | undefined, keys: readonly string[]): ProtocolMetadata | undefined;