import * as grpc from "grpc";
import { CallOptions, Metadata } from "grpc";
import { ClientConstructor, Pool, PoolOptions } from "./pool";
import { GrpcRequest } from "./request";
declare type CallClientOption = CallOptions & {
    metadata?: Metadata;
};
export interface ClientDefaults {
    callOptions: CallClientOption;
    clientOptions: PoolOptions;
}
export declare class Client<GrpcClient extends grpc.Client> {
    private readonly _client;
    private readonly options?;
    protected static defaults: ClientDefaults;
    pool: Pool<GrpcClient>;
    constructor(_client: Pool<GrpcClient> | ClientConstructor<GrpcClient>, options?: PoolOptions | undefined);
    static create<GrpcClient extends grpc.Client>(_client: Pool<GrpcClient> | ClientConstructor<GrpcClient>, options?: PoolOptions): Client<GrpcClient>;
    static getClientDefaults(): PoolOptions;
    static getCallDefaults(): CallClientOption;
    static setClientDefaults(defaults: Partial<PoolOptions>): void;
    static setCallDefaults(defaults: Partial<CallClientOption>): void;
    newClient(): Client<GrpcClient>;
    get client(): GrpcClient;
    clientOptions(): PoolOptions;
    callOptions(): CallClientOption;
    protected initPool(client: Pool<GrpcClient> | ClientConstructor<GrpcClient>): Pool<GrpcClient>;
    request(): GrpcRequest<GrpcClient> & { [P in keyof GrpcClient]: import("./request").ObservableGrpcCall<GrpcClient, P, ReturnType<((...args: any) => any) & GrpcClient[P]>, ReturnType<((...args: any) => any) & GrpcClient[P]>, ReturnType<((...args: any) => any) & GrpcClient[P]>, ReturnType<((...args: any) => any) & GrpcClient[P]>>; };
}
export {};