/** Same path decentlan uses: `<carrier dataDir>/daemon.pid`. */
export declare function identityLockPath(dataDir: string): string;
/** The live pid holding this identity, or null when it is free. */
export declare function identityLockHolder(dataDir: string): number | null;
export declare class IdentityLockedError extends Error {
    readonly holderPid: number;
    constructor(holderPid: number);
}
/**
 * Take the lock for this process. Throws {@link IdentityLockedError} when a
 * live holder exists — refusing to start is always better than starting a
 * second peer, because the damage from the latter shows up later, as
 * unexplained message loss, rather than here as a clear error.
 *
 * A stale file (holder gone) is taken over silently: that is a crash we already
 * survived, not a conflict.
 */
/** Where a holder publishes the port its local HTTP API is on. */
export declare function uiPortHintPath(dataDir: string): string;
/** Called by the server once it knows which port it actually bound. */
export declare function setUiPortHint(port: number, dataDir?: string): void;
export declare function acquireIdentityLock(dataDir: string): () => void;