fishbird/cjs/chunk-RCO7SQLF.js

Fishbird is a simple, lightweight, and fast Promise utility library

'use strict';
function map(arr, fn, { concurrency = Infinity } = { concurrency: Infinity }) {
  if (typeof concurrency !== "number") {
    throw new TypeError(`${String(concurrency)} is not a number`);
  }
  if (!Array.isArray(arr)) {
    throw new TypeError(`arr must be collection, but got ${typeof arr}`);
  }
  const fn2 = fn || ((item) => item);
  return new Promise((resolve, reject) => {
    let completed = 0;
    let started = 0;
    let running = 0;
    const results = new Array(arr.length).fill(void 0);
    let rejected = false;
    function start(index) {
      const cur = arr[index];
      Promise.resolve(fn2.call(cur, cur, index, arr)).then((result) => {
        running--;
        completed++;
        results[index] = result;
        replenish();
      }).catch((err) => {
        rejected = true;
        reject(err);
      });
    }
    function replenish() {
      if (rejected)
        return;
      if (completed >= arr.length) {
        resolve(results);
        return;
      }
      while (running < concurrency && started < arr.length) {
        start(started);
        running++;
        started++;
      }
    }
    replenish();
  });
}
var map_default = map;
exports.map = map;
exports.map_default = map_default;
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