export interface FileReader {
    readTextFile(path: string): string | undefined;
}
export interface FileWriter {
    writeTextFile(path: string, contents: string): void;
}
declare class RealFileSystem implements FileReader, FileWriter {
    readTextFile(path: string): string | undefined;
    writeTextFile(path: string, contents: string): void;
}
export declare const REAL_FILE_SYSTEM: RealFileSystem;
export {};
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