import { RawAxiosRequestHeaders } from 'axios';
import { APIGatewayProxyEvent } from 'aws-lambda';
/**
 * Copy headers into multiValueHeaders.
 * Needed for invoking @vendia/serverless-express handlers.
 * https://github.com/apollographql/apollo-server/issues/5504
 */
export declare type ToProxyHeaders = Pick<APIGatewayProxyEvent, 'multiValueHeaders' | 'headers'>;
export declare const toProxyHeaders: (headers?: RawAxiosRequestHeaders) => ToProxyHeaders;