import * as grpc from '@grpc/grpc-js';
export { Metadata } from '../common/metadata';
declare module '../common/metadata' {
    namespace Metadata {
        /**
         * Converts a metadata object from the @grpc/grpc-js runtime library into a unified {@link Metadata} instance.
         * @param metadata @grpc/grpc-js runtime library metadata instance.
         * @returns The replicated reactive-grpc metadata instance.
         */
        function fromGrpcType(metadata: grpc.Metadata): Metadata;
    }
    interface Metadata {
        /**
         * Converts this metadata object to an instance of the Metadata class from the @grpc/grpc-js runtime library.
         * @returns @grpc/grpc-js runtime library metadata instance.
         */
        toGrpcType(): grpc.Metadata;
    }
}