Creating a function in a JavaScript module that can be exported to the window namespace

Question

Creating a function in a JavaScript module that can be exported to the window namespace

One of the goals of modules is to protect variables and functions defined inside from being accessed outside the script. However, if you want to export a specific function for global use, there are ways to accomplish this. Merely assigning it to the window object may not always be successful:

In your index.html, consider the following approach:

<script type="module">
   const add = (a, b) => a + b;
   window.add = add;
</script>
<script>
   console.log(window.add(1, 2));
</script>

The result might lead to a

Uncaught TypeError: window.add is not a function

error, which indicates that further adjustments or alternative solutions could be necessary.

javascript es6-modules

Answer 1

Answer №1

One reason for this behavior is that the "module" script is being interpreted after the regular script. Confirming this can be done by adding a console log.

<script type="module">
  var multiply = (x, y) => x * y;
  window.multiply = multiply;
  console.log("Second to run:", window.multiply)
</script>

<script>
  console.log("First to run:", window.multiply)
  console.log(window.multiply(2, 5));
</script>

Answer 2

One reason for this behavior is that the "module" script is being interpreted after the regular script. Confirming this can be done by adding a console log.

<script type="module">
  var multiply = (x, y) => x * y;
  window.multiply = multiply;
  console.log("Second to run:", window.multiply)
</script>

<script>
  console.log("First to run:", window.multiply)
  console.log(window.multiply(2, 5));
</script>

Creating a function in a JavaScript module that can be exported to the window namespace

Answer №1

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