import type { Readable } from 'stream';
import type { AwsRegion } from './regions';
import type { RequestHandler } from './types';
export declare function lambdaReadFileImplementation({ bucketName, key, region, expectedBucketOwner, forcePathStyle, requestHandler }: {
    bucketName: string;
    key: string;
    region: AwsRegion;
    expectedBucketOwner: string | null;
    forcePathStyle: boolean;
    requestHandler: RequestHandler | null;
}): Promise<Readable>;