export declare function ensureDir(dirPath: string): Promise<void>;
export declare function assertSubPath(baseDir: string, targetPath: string): void;
export declare function writeTextFile(baseDir: string, relativePath: string, content: string): Promise<{
    bytesWritten: number;
    absPath: string;
} | never>;
export declare function readTextFile(baseDir: string, relativePath: string): Promise<string>;
export declare function sha256(content: string): string;
export declare function prettierFormat(content: string): Promise<string>;
export declare function acornParse(content: string): Promise<void>;
export declare function execNodeScript(entryAbsPath: string, args?: string[], timeoutMs?: number, cwd?: string): Promise<{
    code: number;
    stdout: string;
    stderr: string;
}>;
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