how to make edit section include front extension ?

I write an extension to render and preview rst file.

when I try to package the extension, I found the edit section don't contain the front extension of index.JS file.

tree and ipynb section contain front extension. How to make edit section include front extension?

Start by inspecting the edit, tree, and ipynb sections and the extension's index.JS while reproducing the packaging behavior for an rst extension. Compare how the tree and ipynb sections include the front extension, then confirm that the packaged edit section includes it as well.

Written by the indexing model from the issue text.