import assert from "assert";
import each from "../lib/index.js";

let running = 0;
const result = await each(
  [{ id: "a" }, { id: "b" }, { id: "c" }, { id: "d" }],
  true,
  function (item, index) {
    if (running !== index) {
      throw Error("Invalid execution");
    }
    running++;
    return new Promise((resolve) =>
      setTimeout(() => {
        if (running !== 4 - index) {
          throw Error("Invalid execution");
        }
        running--;
        resolve(`${item.id}@${index}`);
      }, 100),
    );
  },
);

assert.deepStrictEqual(result, ["a@0", "b@1", "c@2", "d@3"]);