promise | Promise - Promise with callback in each step | Reactive Programming library

You function getTab seems not right, you are currently trying to query on the url. Not on the query options. The following function should work.

You most likely don't want to call getData on every render, so you should store the response somewhere, it might be in the component state:

I think I know the issue. The issue is this:

There are 2 separate queues for handling of the callbacks. A macro and a micro queue. setTimeout enqueues an item in the macro queue, while promise resolution - to the micro queue. The currently executing macro task(the main script itself in this case) is executed synchronously, line by line until it is finished. The moment it is finished, the loop executes everything queued in the microtask queue before continuing with the next item from the macro queue(which in your case is the console.log("hello") queued from the setTimeout).

Basically, the flow looks like this:

1. Script starts executing.

MacrotaskQueue: [], MicrotaskQueue: [].

1. setTimeout(() => console.log("hello"), 0); is encountered which leads to pushing a new item in the macrotask queue.

MacrotaskQueue: [console.log("hello")], MicrotaskQueue: [].

1. Promise.resolve('Success!').then(console.log) is read. Promise resolves to Success! immediately and console.log callback gets enqueued to the microtask queue.

MacrotaskQueue: [console.log("hello")], MicrotaskQueue: [console.log('Success!')].

1. The script finishes executing so it checks if there is something in the microtask queue before proceeding with the next task from the macro queue.
2. console.log('Success!') is pulled from the microtask queue and executed.

MacrotaskQueue: [console.log("hello")], MicrotaskQueue: [].

1. Script checks again if there is something else in the microtask queue. There is none, so it fetches the first available task from the macrotask queue and executes it, namely - console.log("hello").

MacrotaskQueue: [], MicrotaskQueue: [].

1. After the script finishes executing the console.log("hello"), it once again checks if there is anything in the microtask queue. It is empty, so it checks the macrotask queue. It is empty as well so everything queued is executed and the script finishes.

This is a simplified explanation, though, as it can get trickier. The microtask queue normally handles mainly promise callbacks, but you can enqueue code on it yourself. The newly added items in the microtask queue will still be executed before the next macrotask item. Also, microtasks can enqueue other microtasks, which can lead to an endless loop of processing microtasks.

Some useful reference resources:

• The event loop
• Microtasks
• Using Microtasks

Simply use Optional chaining here:

When you add async prior to the function then this means that the function will return a promise in response, and in order to work with that result You need to do something like this

Have you tried renaming your home.js to index.js?

After that, clean the cache by gatsby clean.

You could try using element.scrollTop to save the position of the scrollbar and then use the saved value to set the scrollTop property to where it was when the timed function is called.

(https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTop?retiredLocale=it - https://www.javascripttutorial.net/dom/css/get-and-set-scroll-position-of-an-element/)

If your functions are declared async, you need to use the await keyword when calling them. And consequently you need to declare the Cloud Function itself as async.

So the following should do the trick: