fetchify

import fetchify from "https://deno.land/x/fetchify@0.1.3/mod.ts";

const endpoint = "https://jsonplaceholder.typicode.com";

const limit = new fetchify.Limiter({
  rps: 3,
});

for (let i = 20; i--;) {
  console.log(`push to queue ${i}`);
  limit.fetch(`${endpoint}/posts/${i}`).finally(() => {
    console.log(`finally ${i}`);
  });
}