import * as AsyncLock from "async-lock";
const lock = new AsyncLock();

lock.acquire("key", (done) => {
  done();
}, (err, ret) => { /* ... */ });

lock.acquire("key", (done) => { done(); })
  .then(() => { /* ... */ })
  .catch(() => { /* ... */ });

lock.acquire("key", () => "stringValue")
// Check returned value's type is inherited properly
    .then((str) => str.replace("s", "S"));

lock.acquire("key", async () => "stringValue")
// Check returned value's type is inherited properly
    .then((str) => str.replace("s", "S"));

lock.acquire([ "key1", "key2" ], (done) => {
  done();
}, (err, ret) => { /* ... */ });

lock.isBusy();
lock.isBusy('key');

const lock2 = new AsyncLock({ timeout : 5000 });
const lock3 = new AsyncLock({ maxPending : 5000 });
const lock4 = new AsyncLock({ Promise: null });