Issue Summary

Bitbucket CSE template is broken on PR overview page. Tested on Bitbucket v9.4

Repo: https://bitbucket.org/atlassianlabs/bitbucket-client-side-extensions-template/src/master/

Reported: https://community.developer.atlassian.com/t/bitbucket-client-side-extensions-template-broken-on-pr-overview-page/94675/2

Steps to Reproduce

1. Clone and build `mvn clean install -DskipTests`
2. Upload the app to Bitbucket
3. Go to PR overview page

Expected Results

The sample extensions should appear on PR overview page

Actual Results

No extensions are being shown

Workaround

Add below to webpack config `plugins`

```
new webpack.DefinePlugin(

{ 'module.hot':'false', }

),
```

For example

```
plugins: [
...plugins(!isProduction),
clientsideExtensions,
newwebpack.DefinePlugin(

{ 'module.hot':'false', }

),
],
```