Expected behavior:

When paused in a breakpoint within a .js file with type="module", it should correctly display the module's scope block on the right sidebar.

Actual behavior:

Instead, only <this> : undefined is displayed in that block.

Screenshots:

text/javascript

<script type="text/javascript" src="main.js"></script>

module

<script type="module" src="main.js"></script>

To reproduce:

1. Clone https://github.com/notjaril/module-scope-example.git
2. Open index.html
3. Case 1 (text/javascript), set a breakpoint at main.js:7. Note the Scopes frame in the right sidebar
4. Change the script type in index.html from text/javascript to module
5. Case 2 (module), set a breakpoint at main.js:7. Note the Scopes frame in the right sidebar

Exported and closed over variables actually show up OK in the scopes view. The problem is that unaliased locals are supposed to be exposed to the debugger (like they are in function/lexical/etc. scopes) but the necessary logic is missing.

https://hg.mozilla.org/mozilla-central/rev/45fb04e542c5