Loop protection counter in TypeScript

loop-protection-counter.ts

import { DevError, debounce } from "@project/prelude";

export class LoopError extends DevError {
  constructor(
    message: string,
    public readonly debounceMs: number,
    public readonly maxCount: number,
  ) {
    super(`${message} (exceeded ${maxCount} calls in ${(debounceMs * 0.001).toFixed(1)}s)`);
  }
}

export function createCounterWithLoopProtection({ debounceMs = 1000, maxCount = 20, message = "loop detected" } = {}) {
  let count = 0;
  let max = maxCount;
  const scheduleClearLoopDetection = debounce(debounceMs, () => {
    max = count + maxCount;
  });
  return () => {
    count++;
    scheduleClearLoopDetection();
    if (count > max) {
      throw new LoopError(message, debounceMs, maxCount);
    }
    return count;
  };
}