import type { ExtractConfig, PackageDependency, PackageFileContent } from '../types';
export declare const DOCKER_PREFIX: RegExp;
export declare function isDockerRef(ref: string): boolean;
export declare const BUILDPACK_REGISTRY_PREFIX = "urn:cnb:registry:";
export declare function isBuildpackRegistryRef(ref: string): boolean;
export declare function extractPackageFile(content: string, packageFile: string, config: ExtractConfig): PackageFileContent | null;
export declare function getDep(currentFrom: string): PackageDependency | null;