import { BasePlugin } from '@opentelemetry/core';
import * as grpcTypes from 'grpc';
import { grpc, GrpcPluginOptions, ModuleExportsMapping } from './types';
/** The metadata key under which span context is stored as a binary value. */
export declare const GRPC_TRACE_KEY = "grpc-trace-bin";
export declare class GrpcPlugin extends BasePlugin<grpc> {
    readonly moduleName: string;
    readonly version: string;
    static readonly component = "grpc";
    readonly supportedVersions: string[];
    protected _config: GrpcPluginOptions;
    constructor(moduleName: string, version: string);
    protected readonly _internalFilesList: ModuleExportsMapping;
    protected readonly _basedir: string;
    protected patch(): typeof grpcTypes;
    protected unpatch(): void;
    private _setSpanContext;
    private _patchServer;
    /**
     * Returns true if the server call should not be traced.
     */
    private _shouldNotTraceServerCall;
    private _clientStreamAndUnaryHandler;
    private _serverStreamAndBidiHandler;
    private _patchClient;
    private _getMethodsToWrap;
    private _getPatchedClientMethods;
    /**
     * This method handles the client remote call
     */
    private _makeGrpcClientRemoteCall;
    private _getMetadata;
}
export declare const plugin: GrpcPlugin;