import TaskManager from '../TaskManager.js';
/**
 * Validates the structure and dependencies in the execution plan.
 *
 * Checks for:
 * - Self-dependencies
 * - Dependencies on undefined operations
 * - Cross-group dependencies (which are currently disallowed)
 *
 * If any validation errors are found, the function throws with a detailed message.
 */
export declare function validateExecutionPlan(this: TaskManager): void;