/**
 * Log files are created 0600 and tightened to 0600 on every open, so a file
 * that pre-exists with looser bits (or was made by launchd) does not stay
 * world-readable.
 */
/** Create the file if missing and force mode 0600. Best effort on chmod. */
export declare function tightenLog(path: string): void;
export declare function appendPrivate(path: string, data: string): void;
export declare function writePrivate(path: string, data: string): void;
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