import * as grpc from '@grpc/grpc-js';
import _ from 'lodash';
import { ActionEndpoint, ApiServiceGrpcActionConfig, ExtendedActionEndpoint, ExtendedGrpcActionEndpoint, ExtendedRestActionEndpoint, Headers, ProxyHeadersFunctionExtra } from '../models/common';
import { Dict, GatewayContext } from '../models/context';
import { AppErrorConstructor } from '../models/error';
export declare function isExtendedActionEndpoint(endpoint: ActionEndpoint): endpoint is ExtendedActionEndpoint;
export declare function isExtendedGrpcActionEndpoint(endpoint: ActionEndpoint): endpoint is ExtendedGrpcActionEndpoint;
export declare function isExtendedRestActionEndpoint(endpoint: ActionEndpoint): endpoint is ExtendedRestActionEndpoint;
export declare function getKeys<T extends object>(obj: T): (keyof T)[];
/**
 * This function should only use to sanitize debugHeaders that are creating in our code
 */
export declare function sanitizeDebugHeaders(debugHeaders: Headers): _.Omit<Headers, "x-api-request-body">;
export declare function getHeadersFromMetadata(metadata: Record<string, grpc.MetadataValue[]>, prefix?: string): Record<string, string>;
export declare function handleError<Context extends GatewayContext>(ErrorConstructor: AppErrorConstructor, error: unknown, ctx: Context, message: string, extra?: Dict): void;
export declare const getProxyHeadersArgs: <Context extends GatewayContext>(serviceName: string, actionName: string, grpcConfig?: ApiServiceGrpcActionConfig<Context, any, any> | undefined) => ProxyHeadersFunctionExtra;