/**
 * Portable filesystem interface. Core logic imports this port, not node:fs.
 * Node adapter implements it; tests can substitute a mock.
 */
export interface FileSystem {
    readFile(path: string, encoding: "utf-8"): Promise<string>;
    readFile(path: string): Promise<Buffer>;
    readdir(path: string): Promise<string[]>;
    writeFile(path: string, data: string, encoding: "utf-8"): Promise<void>;
    appendFile(path: string, data: string, encoding: "utf-8"): Promise<void>;
    mkdir(path: string, options: {
        recursive: true;
    }): Promise<void>;
    stat(path: string): Promise<{
        size: number;
    }>;
    readFileSync(path: string, encoding: "utf-8"): string;
}
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