6.1.0 - bug with <script type="systemjs-module"> before systemjs is loaded

[joeldenning]

In 6.1.0, the following code works:

<script type="systemjs-importmap">
  {
    "imports": {
      "foo": "/foo.js"
    }
  }
</script>
<script src="https://cdn.jsdelivr.net/npm/systemjs@6.1.0/dist/system.js"></script>
<script type="systemjs-module" src="import:foo"></script>

But the following code doesn't:

<script type="systemjs-importmap">
  {
    "imports": {
      "foo": "/foo.js"
    }
  }
</script>
<script type="systemjs-module" src="import:foo"></script>
<script src="https://cdn.jsdelivr.net/npm/systemjs@6.1.0/dist/system.js"></script>

The bug is related to whether the <script type="systemjs-module"> element is before or after the <script src="system.js"> element.

Repo that demonstrates the problem: https://github.com/joeldenning/systemjs-race-condition-bug