/**
 * Sandbox path helpers — pure string math, no IO. Mirrors the backend's
 * naming convention so derived output dirs line up.
 */
export declare function lowerExt(path: string): string;
export declare function baseName(path: string): string;
export declare function dirName(path: string): string;
export declare function stem(path: string): string;
/** Returns `<parent>/<stem>` — the file's adjacent data directory. */
export declare function getFileDataDir(filePath: string): string;
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