/**
 * Advisory lock around the crash ledger's check-then-write sequence.
 *
 * Split out of crash-reporter.ts (i-055-cli revision round 1, alongside
 * crash-consent.ts) to keep that file under the repo's 500-line guideline —
 * locking is a distinct, self-contained concern from redaction/dedup/filing.
 */
/**
 * Best-effort advisory lock around the ledger's check-then-write sequence,
 * to close the race where two near-simultaneous crashes (e.g. a supervisor
 * restarting a process that panics on every startup) both pass the dedup
 * check before either records its result, filing duplicate issues.
 *
 * Returns an ownership id if acquired (pass to releaseLock so it only ever
 * removes its OWN lock, never one a stale-recovery elsewhere already
 * re-acquired), or null if not acquired — callers proceed unlocked rather
 * than block indefinitely, since a lock miss only reopens the same race this
 * exists to narrow, not something worth ever hanging a crash handler over.
 */
export declare function acquireLock(): Promise<string | null>;
export declare function releaseLock(lockId: string | null): void;
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