export declare const createStubFileSystem: ({ data, exists, isDir }?: {
    data?: {} | undefined;
    exists?: boolean | undefined;
    isDir?: boolean | undefined;
}) => {
    fileExists: () => Promise<boolean>;
    directoryExists: () => Promise<boolean>;
    readFile: () => Promise<{}>;
    writeFile: import("jest-mock").Mock<any, any>;
};