/// <reference types="node" />
export interface FileSystem {
    readFileSync(path: string, encoding?: string): Buffer | string;
    writeFileSync(path: string, text: string, encoding?: string): void;
}
export declare const setDefaultFileSystem: (fs?: FileSystem) => void;
export declare const getDefaultFileSystem: () => FileSystem | undefined;
export declare const mustGetDefaultFileSystem: () => FileSystem;