/**
 * Write `content` to `targetPath` with mode 0600, even when `targetPath`
 * already exists. Uses O_CREAT|O_EXCL on a temp sibling (so the kernel
 * guarantees permissions at creation, not after a racy chmod) and then
 * rename(2) into place for atomicity. Readers never see a torn write,
 * and a crash mid-write leaves either the old file or a stray .tmp
 * (cleaned by the next attempt or manually) — never a half-written target.
 */
export declare function atomicWritePrivateFile(targetPath: string, content: string): void;
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