/**
 * Workflow Lock
 *
 * Simple in-process mutex to prevent concurrent workflow operations
 * (sync, migrate, download, backup) from running simultaneously.
 *
 * @since v2.5.16
 */
/**
 * Simple in-process workflow mutex.
 * Prevents concurrent workflow operations from running simultaneously.
 */
export declare class WorkflowLock {
    private activeWorkflow;
    /**
     * Acquire the lock for a workflow type.
     * Throws if another workflow is already running.
     * Returns an object with a `release` function to unlock when done.
     */
    acquire(type: string): {
        release: () => void;
    };
    /**
     * Check if any workflow is currently running.
     */
    isLocked(): boolean;
    /**
     * Get the name of the currently active workflow, or null if none.
     */
    getActiveWorkflow(): string | null;
}
/** Singleton workflow lock instance */
export declare const workflowLock: WorkflowLock;
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