/**
 * Executes an array of async functions in parallel with concurrency control.
 *
 * @param tasks - Array of async functions to execute.
 * @param concurrency - Maximum number of concurrent executions (default: 5).
 * @returns Promise that resolves with array of results in the same order as input tasks.
 *
 * @throws {Error} If concurrency is less than 1 or tasks array contains non-functions.
 *
 * @example
 * // Basic parallel execution with default concurrency
 * const results = await asyncParallel([
 *   async () => fetch('/api/user/1').then(r => r.json()),
 *   async () => fetch('/api/user/2').then(r => r.json()),
 *   async () => fetch('/api/user/3').then(r => r.json()),
 * ]); // Executes up to 5 concurrently
 *
 * @example
 * // Custom concurrency limit
 * const results = await asyncParallel([
 *   async () => heavyComputation(1),
 *   async () => heavyComputation(2),
 *   async () => heavyComputation(3),
 *   async () => heavyComputation(4),
 * ], 2); // Only 2 concurrent executions
 *
 * @example
 * // With mixed async operations
 * const results = await asyncParallel([
 *   async () => databaseQuery('SELECT * FROM users'),
 *   async () => cacheGet('config'),
 *   async () => externalApiCall('/data'),
 * ], 3);
 *
 * @note Results are returned in the same order as input tasks, regardless of completion order.
 *
 * @complexity Time: O(n/c) where n is number of tasks and c is concurrency, Space: O(n)
 */
export declare function asyncParallel<T>(tasks: Array<() => Promise<T>>, concurrency?: number): Promise<T[]>;
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