Why JS cannot find the function in babel script?

Here's my index file

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta content="IE=Edge" http-equiv="X-UA-Compatible">
    <meta name="description" content="test">
    <title>test</title>
</head>

<body>
    <!-- <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs@2.0.0/dist/tf.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/fetch-polyfill@0.8.2/fetch.js"></script> -->
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    <script src="/app.js" type='text/babel'></script>
    
    
    <script type="text/javascript">
        fnc();
    </script>

</body>

</html>

And here's app.js file

function fnc() {
    console.log('myname');
}

I wonder why console says:

Uncaught ReferenceError: fnc is not defined
    at (index):19
(anonymous) @ (index):19

If I change script type with text/javascript, it works without problem. However, I need it to be babel script for tensorflow script to work in IE11.

Can anybody help me out?

Solution

In addition to @CertainPerformance's answer,

If you want to call the function fnc() directly, Then the type should be text/babel, Because it is defined in babel and transpiled. If you use text/javascript it will search for it in window object.

<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<script src="/app.js" type='text/babel'></script>

<script type="text/babel"> //<-- not text/javascript
    fnc(); // works fine
</script>