/// <reference types="node" />
import { GrpcJsPlugin } from '../grpcJs';
import type { GrpcClientFunc } from '../types';
import { Span } from '@opentelemetry/api';
import type * as grpcJs from '@grpc/grpc-js';
import { EventEmitter } from 'events';
/**
 * Parse a package method list and return a list of methods to patch
 * with both possible casings e.g. "TestMethod" & "testMethod"
 */
export declare function getMethodsToWrap(this: GrpcJsPlugin, client: typeof grpcJs.Client, methods: {
    [key: string]: {
        originalName?: string;
    };
}): string[];
/**
 * Parse initial client call properties and start a span to trace its execution
 */
export declare function getPatchedClientMethods(this: GrpcJsPlugin): (original: GrpcClientFunc) => () => EventEmitter;
/**
 * Execute grpc client call. Apply completitionspan properties and end the
 * span on callback or receiving an emitted event.
 */
export declare function makeGrpcClientRemoteCall(original: GrpcClientFunc, args: unknown[], metadata: grpcJs.Metadata, self: grpcJs.Client): (span: Span) => EventEmitter;
/**
 * Inject opentelemetry trace context into `metadata` for use by another
 * grpc receiver
 * @param metadata
 */
export declare function setSpanContext(metadata: grpcJs.Metadata): void;