Angular 11 error being thrown on IE11 with Storybook 6.1 and 6.2@alpha

Describe the bug When bundling for IE11 it appears that code isn’t being transpiled.

Two errors are being thrown. “Const must be initialized” and “Syntax error”

To Reproduce Steps to reproduce the behavior:

1. Create a new application for Angular 11
2. Integrate Storybook 6.1
3. Update .browserlistrc so IE11 is opt-in
4. Open on IE11 browser and view error in console

Expected behavior Should run successfully.

Screenshots Example Repo: https://github.com/thomasoreilly/storybook-angular11-ie11-6.1-issue Deployment of Repo: https://thomasoreilly.github.io/storybook-angular11-ie11-6.1-issue/?path=/story/example-introduction--page

Code snippets If applicable, add code samples to help explain your problem.

System Please paste the results of npx sb@next info here.

Environment Info: System: - OS: macOS 10.15.7 - CPU: (12) x64 Intel® Core™ i7-9750H CPU @ 2.60GHz Binaries: - Node: 12.20.0 - ~/.nvm/versions/node/v12.20.0/bin/node - Yarn: 1.22.10 - ~/.nvm/versions/node/v12.20.0/bin/yarn - npm: 6.14.8 - ~/.nvm/versions/node/v12.20.0/bin/npm Browsers: - Chrome: 87.0.4280.141 - Firefox: 78.6.1 - Safari: 14.0.1 npmPackages: - @storybook/addon-actions: ^6.1.14 => 6.1.14 - @storybook/addon-essentials: ^6.1.14 => 6.1.14 - @storybook/addon-links: ^6.1.14 => 6.1.14 - @storybook/angular: ^6.1.14 => 6.1.14 - @storybook/preset-ie11: 0.0.1 => 0.0.1

Additional context This issue is also happening on the latest alpha for 6.2.

[shilman]

@thomasoreilly can you kick the tires on this for me? https://github.com/storybookjs/storybook/pull/13741

yarn bootstrap --core
cd examples/angular-cli
yarn storybook

[thomasoreilly]

Hey @shilman.

Just recently installed 6.2 and we are still experiencing this issue with IE11. We are also seeing experiencing this issue on a vanilla Angular setup. Has there been any discussion about IE11 support for Angular and Storybook?