Issue encountered when attempting to make a global call to an asynchronous function: "The use of 'await' is restricted to async functions and the top level bodies of modules."

As I embark on solving this issue, I want to point out that while there are similar questions on SO based on the title, upon close examination, they seem more intricate than my specific situation. The explanations provided in those threads do not quite align with what I am experiencing.

I am seeking assistance to comprehend why the code snippet below is triggering the following error:

Uncaught SyntaxError: await is only valid in async functions and the top level bodies of modules.

At first glance, it appears that the problematic await statement is indeed within a “top level” body. But could there be another definition for a top level body that I am overlooking? Any insights would be greatly appreciated!

UPDATE to differentiate from a related question mentioned here: My query does not revolve around httpGet, there are key contextual differences, and most importantly, I have received a solution that resolves my issue, unlike the answer proposed in the solitary response to the linked question. Therefore, although I found a resolution here, I believe keeping my question available could benefit the broader audience.

var data;
await getData();
document.body.write(data);

async function getData() {
    const res = await fetch("https://jsonplaceholder.typicode.com/posts", {
        method: 'GET',
        headers: {
          'Accept': 'application/json, text/plain, */*',
          'Content-type': 'application/json'
        }
    });
    data = await res.json();
}

Answer №1

If you encounter the error message regarding top-level await, it simply indicates that you are attempting to utilize the async/await syntax outside of an async function. To address this issue, a workaround is to define a new function such as main and place your code within it.

async function main() {
  var info;
  await fetchData();
  document.body.write(info);
}

main();

Although top-level async/await functionality may one day be supported with a proposed solution, in the meantime, you can make use of a babel plugin found at https://babeljs.io/docs/en/babel-plugin-syntax-top-level-await to enable this feature without the need for a wrapper function like main.

Answer №2

Absolutely, it is considered global code located within my script.js file. I pondered what could be more "top-level" than that?

As highlighted in a comment, the real issue isn't about being "top level" but rather about being "in a module".

Web browsers will treat scripts as modules only if the type attribute instructs them to do so:

<script type="module" src="script.js"></script>

This allows for support of import (assuming CORS permits), loads the script asynchronously, and prevents the top-level scope from being global.

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