@upendra.manike/async-utils/dist/index.mjs

Async control utilities for JavaScript/TypeScript: retry with exponential backoff, concurrency-limited queues, promise pools, sequential execution, timeout handling, abort signals. Perfect for API calls, data fetching, and async operations. AI-friendly an

// src/index.ts
function sleep(ms, signal) {
  return new Promise((resolve, reject) => {
    const t = setTimeout(() => {
      cleanup();
      resolve();
    }, ms);
    const onAbort = () => {
      cleanup();
      reject(new DOMException("Aborted", "AbortError"));
    };
    const cleanup = () => {
      clearTimeout(t);
      signal?.removeEventListener("abort", onAbort);
    };
    if (signal) {
      if (signal.aborted) return onAbort();
      signal.addEventListener("abort", onAbort);
    }
  });
}
function backoffDelay(attempt, base = 250, kind = "exponential", jitter = true) {
  let delay = base;
  if (kind === "linear") delay = base * attempt;
  if (kind === "exponential") delay = base * Math.pow(2, attempt - 1);
  if (jitter) delay = Math.random() * delay;
  return Math.min(delay, 3e4);
}
async function withRetry(fn, opts = {}) {
  const {
    retries = 3,
    baseDelayMs = 250,
    backoff = "exponential",
    retryable = () => true,
    signal
  } = opts;
  let attempt = 0;
  while (true) {
    attempt += 1;
    try {
      if (signal?.aborted) throw new DOMException("Aborted", "AbortError");
      return await fn();
    } catch (err) {
      if (attempt > retries || !retryable(err)) throw err;
      const delay = backoffDelay(attempt, baseDelayMs, backoff);
      await sleep(delay, signal);
    }
  }
}
async function pMapSeries(items, mapper) {
  const out = [];
  for (let i = 0; i < items.length; i += 1) {
    out.push(await mapper(items[i], i));
  }
  return out;
}
function timeoutPromise(promise, ms, message = "Timed out") {
  let timer;
  const timeout = new Promise((_, reject) => {
    timer = setTimeout(() => reject(new Error(message)), ms);
  });
  return Promise.race([promise, timeout]).finally(() => clearTimeout(timer));
}
async function pQueue(tasks) {
  const results = [];
  for (const task of tasks) {
    results.push(await task());
  }
  return results;
}
async function pMapLimit(items, limit, mapper) {
  if (limit <= 0) return [];
  const results = new Array(items.length);
  let nextIndex = 0;
  const workers = new Array(Math.min(limit, items.length)).fill(0).map(async () => {
    while (true) {
      const current = nextIndex;
      if (current >= items.length) break;
      nextIndex += 1;
      results[current] = await mapper(items[current], current);
    }
  });
  await Promise.all(workers);
  return results;
}
function memoizeAsync(fn, keyFn) {
  const cache = /* @__PURE__ */ new Map();
  return (...args) => {
    const key = keyFn ? keyFn(...args) : JSON.stringify(args);
    let cached = cache.get(key);
    if (!cached) {
      cached = fn(...args);
      cache.set(key, cached);
    }
    return cached;
  };
}
function promiseRace(promises) {
  return Promise.race(promises);
}
async function concurrencyLimitedQueue(tasks, concurrency) {
  if (concurrency <= 0) return [];
  const results = new Array(tasks.length);
  let next = 0;
  let running = 0;
  let resolveAll = null;
  new Promise((resolve) => resolveAll = resolve);
  return new Promise((resolve, reject) => {
    const runNext = () => {
      if (next >= tasks.length && running === 0) {
        resolveAll();
        return resolve(results);
      }
      while (running < concurrency && next < tasks.length) {
        const current = next++;
        running += 1;
        tasks[current]().then((val) => {
          results[current] = val;
        }).catch(reject).finally(() => {
          running -= 1;
          runNext();
        });
      }
    };
    runNext();
  });
}
async function promisePool(iterator, concurrency) {
  const tasks = Array.from(iterator);
  return concurrencyLimitedQueue(tasks, concurrency);
}
var asyncUtils = { sleep, backoffDelay, withRetry, pMapSeries, timeoutPromise, pQueue, pMapLimit, memoizeAsync, promiseRace, concurrencyLimitedQueue, promisePool };

export { asyncUtils, backoffDelay, concurrencyLimitedQueue, memoizeAsync, pMapLimit, pMapSeries, pQueue, promisePool, promiseRace, sleep, timeoutPromise, withRetry };
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