/**
 * Atomic file write utilities.
 *
 * Uses tmp file + rename pattern for crash-safe writes.
 */
export declare function atomicWriteFileSync(targetPath: string, data: string | Buffer, options?: {
    mode?: number;
}): void;
export declare function atomicWriteJsonSync(targetPath: string, data: unknown): void;
export declare function atomicWriteFileAsync(targetPath: string, data: string | Buffer, options?: {
    mode?: number;
    shouldAbort?: () => boolean;
}): Promise<void>;
export declare function atomicWriteJsonAsync(targetPath: string, data: unknown, options?: {
    shouldAbort?: () => boolean;
}): Promise<void>;
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