What is the reason why variables are not accessible in the browser console when utilizing ES modules?

I'm puzzled by the fact that I can't access defined variables in the browser console when using type="module" for my script.

Here's a hypothetical scenario:

<!DOCTYPE html>
<html>
<head>
  <div id="containerFirst">...</div>
  <div id="differentContainer">...</div>
</head;

<body>
  ...
</body>
<script type="module" src="module.js"></script>
<script src="normal.js"></script>
</html>

Now, here are the contents of module.js:

export const firstContainer = document.getElementById('containerFirst');

And the similar variable structure from normal.js:

const otherContainer = document.getElementById('differentContainer');

While I can directly access the variable defined in normal.js in the console, I encounter an issue with accessing the one from module.js. Any insights on this would be greatly appreciated. Thanks!

Answer №1

If you were to pause at a breakpoint within the specific module's code, then and only then would you have access to the module variables. However, without this breakpoint, access to these variables is restricted. It's worth noting that top-level declarations in modules are intentional not globals. Each module is encapsulated within its own scope, almost resembling a function that is executed just once (a crude comparison), effectively making top-level declarations private to that module's scope (unless explicitly exported).

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