4961. Implement Debounce Function with Immediate Flag (Part 35)
Promises & AsyncTypeScript Types
### Problem #4961: Implement Debounce Function with Immediate Flag (Part 35)
**Domain:** `Frontend & Web` | **Topic Focus:** `Promises & Async, TypeScript Types`
Implement an optimized, production-grade solution for **Implement Debounce Function with Immediate Flag (Part 35)**.
### Requirements:
1. Your code must handle boundary inputs, edge cases, and maintain optimal time & space complexity.
2. In production, this logic scales to high-throughput environments.
3. Return the exact computed result.
Example 1:
Input: Sample Input #4961
Output: Output 1
Explanation: Demonstrates correct execution for Promises & Async in Frontend & Web.
Constraints:
- Time Complexity: Optimal for standard production loads.
- Space Complexity: O(1) auxiliary or O(N) linear storage.
- Ensure memory safety, clean error propagation, and zero race conditions.