Reproduction repo for issues with Storybook and Angular using strictTemplates compiler options.

Link to issue in Storybook repo: storybookjs/storybook#13748

Getting started

• clone the repo
• npm install

The issue

• npm run start will throw error that template property in button.component is possibly undefined
• npm run storybook will not throw that error (but it should)

Additional context

• When source of the typing errors are in template files, both compilers behave in the way descibed above.
• When the same property is is accessed directly in TS files, both Angular and Storybook correctly throw errors. You can see that by changing button.component.ts file. Remove ? on line 11.