export declare class HarnessLockBusyError extends Error {
    constructor(lockPath: string);
}
export interface HarnessLock {
    release(): void;
}
/**
 * Exclusive harness lock via atomic O_EXCL lockfile creation (spec §7). Guards
 * vat-vs-vat staging/result races for the same subject set. `wait: false`
 * fails fast; the default `wait: true` is reserved for the CLI to poll (v1
 * keeps the simple fail-fast — the CLI surfaces the busy message).
 */
export declare function acquireHarnessLock(harnessRoot: string, opts?: {
    wait?: boolean;
}): HarnessLock;
export interface InstallSignalCleanupOptions {
    /**
     * Invoked once on the first trapped signal, BEFORE exiting — the place to
     * release the harness lock and remove the harness dir so a Ctrl-C mid-run does
     * not leave `.vat-skill-test.lock` (or staged untrusted bytes) behind.
     */
    onSignal: () => void;
    /**
     * Exit hook, injectable for tests. Defaults to `process.exit`. Called with the
     * conventional 128+signal code so the signal is honored, not swallowed.
     */
    exit?: (code: number) => void;
}
/**
 * Trap SIGINT/SIGTERM while the harness lock is held. On the first such signal
 * the handler removes ITSELF (no listener leak, no re-entry), runs `onSignal`
 * (release lock + clean up), then exits with the conventional 128+signal code.
 *
 * Returns a disposer that removes the handlers — the caller MUST call it on
 * normal completion so listeners do not accumulate across runs in a long-lived
 * process (and so tests stay isolated).
 */
export declare function installSignalCleanup(opts: InstallSignalCleanupOptions): () => void;
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