How can I use a function in a bundle.js file using <script> to include the bundle?

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I have a Javascript module called out.js

JavaScript

export default function out(str) {
  //Some Code
  console.log(str);
}

I ran the webpack bundler and created a bundle.js file.
And now I am Importing it to my index.html using a <script> tag.

JavaScript

<!DOCTYPE html>
<html>
  <head><script defer src="bundle.js"></script></head>
  <body>
    <script>
      out("Hello")
    </script>
  </body>
</html>

I get this error.

index.html:6 Uncaught ReferenceError: out is not defined

What I have tried:

I have tried named exports as well as default exports for the out.js, still I get the same error.

Posted 24-Jun-21 20:47pm

Manan Sharma 2021

Updated 24-Jun-21 22:23pm

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Chris Copeland · Answer 1 · 2021-06-24T22:23:00

It's likely you could be getting this error because your body > script tags are being processed before the entire document has had the chance to load it's required resources, especially since you've added the defer attribute (which tells a script not to execute until the page has been completely parsed).

You need to add proper document state processing to ensure that any JS built into the page isn't run until the document is ready:

JavaScript

function onLoaded(fn) {
  if (document.readyState == 'complete' || document.readyState == 'interactive')
    setTimeout(fn, 1);
  else
    document.addEventListener('DOMContentLoaded', fn);
}

onLoaded(function () {
  out('Hello');
});

Alternatively you could consider putting the JS in another JS file and include it in the page after the bundle.js file. Also, fair credit to this StackOverflow answer[^] for the basis of this answer.