import { IPackage } from "ethpkg";
export declare const sleep: (t: number) => Promise<string>;
export declare function getPinnedReference(): Promise<void>;
export declare function getPackageDependencies(specifier: string): Promise<{
    name: any;
    specifier: string;
    pinnedDependency: any;
    dependencies: any;
    pkg: IPackage;
}>;
declare type DependencyTree = {
    [index: string]: any;
};
export declare function getPackageDependencyTree({ specifier }: any): Promise<DependencyTree>;
export declare class VirtualFileSystem {
    _files: any;
    mount(pkg: IPackage, namespace: string, mountPoint?: string): Promise<void>;
    /**
     * FIX: the entry info during mount() is not reliable
     * apparently some tar packages are only constructed of file entries
     * which is why we need an extra safety net to check if a package path is a directory
     * @param filePath
     */
    isDir(filePath: string): boolean;
    readFileSync(filePath: string, enc?: string): any;
    existsSync(filePath: string): boolean;
    statSync(filePath: string): {
        isDirectory: () => boolean;
    };
    stripBOM(content: string): string;
    printPaths(): void;
    persist(): void;
}
export declare const installPackageToVirtualFs: (specifier: string, mountPoint: string) => Promise<VirtualFileSystem>;
export declare const patchResolve: (vfs: VirtualFileSystem, _search_paths: string[]) => void;
export declare const patchRequire: (vfs: VirtualFileSystem) => void;
export {};
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