const promise1 = () => new Promise((resolve) => {

console.log("1");
resolve(["hi", "world"]);

})

const promise2 = (data) => {

console.log("2");

ref.ref("server/events").once("value").then(function (snapshot) {


  console.log(inside firebase ref');

      return Promise.resolve("test");
  }
 })
 }

const promise3 = (value) => {
console.log(" 3 ");
console.log(value)

}

promise1()
.then((value) => promise2(value))
.then((value) => promise3(value));

ref.ref("server/events").once("value").then(function (snapshot) {...

return ref.ref("server/events").once("value").then(function (snapshot) {...

promise1()
.then(promise2)
.then(promise3);