legends810/testingnew

1/**2 * Creates a function that samples calls at regular intervals and captures trailing calls.3 * - Drops calls that occur between sampling intervals4 * - Takes one call per sampling interval if available5 * - Captures the last call if no call was made during the interval6 *7 * @param fn The function to sample8 * @param sampleInterval How often to sample calls (in ms)9 * @returns The sampled function10 */11export function createSampler<T extends (...args: any[]) => any>(fn: T, sampleInterval: number): T {12  let lastArgs: Parameters<T> | null = null;13  let lastTime = 0;14  let timeout: NodeJS.Timeout | null = null;15 16  // Create a function with the same type as the input function17  const sampled = function (this: any, ...args: Parameters<T>) {18    const now = Date.now();19    lastArgs = args;20 21    // If we're within the sample interval, just store the args22    if (now - lastTime < sampleInterval) {23      // Set up trailing call if not already set24      if (!timeout) {25        timeout = setTimeout(26          () => {27            timeout = null;28            lastTime = Date.now();29 30            if (lastArgs) {31              fn.apply(this, lastArgs);32              lastArgs = null;33            }34          },35          sampleInterval - (now - lastTime),36        );37      }38 39      return;40    }41 42    // If we're outside the interval, execute immediately43    lastTime = now;44    fn.apply(this, args);45    lastArgs = null;46  } as T;47 48  return sampled;49}50