/**
 * Build a collision-free sibling temp path for `target`.
 *
 * The temp name is unique per write (`target.<pid>.<seq>.<rand>.tmp`), so
 * concurrent writers to the same target never share one temp file. Sharing a
 * single `target.tmp` allowed an in-flight async write to race a later write's
 * `unlink` + `rename` sequence, letting a stale write land last (or throw
 * ENOENT on rename).
 */
export declare function uniqueTmpPath(target: string): string;
/**
 * Atomically replace `target` with `content`: write a unique sibling `.tmp`
 * file, unlink the existing target, then rename the tmp into place. Parent
 * directories are created as needed. Rename is atomic on POSIX, so readers
 * never observe a partially written file.
 */
export declare function atomicWriteSync(target: string, content: string): void;
/** Async variant of {@link atomicWriteSync}. */
export declare function atomicWrite(target: string, content: string): Promise<void>;
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