docs-bug(datepicker): some examples are missing 'moment' in dependencies

[fvsch]

Documentation Feedback

When trying to run some of the examples from https://material.angular.io/components/datepicker/overview in StackBlitz using the "Edit … in StackBlitz" buttons at the top right, I’m getting build-time errors like:

Error: src/app/datepicker-moment-example.ts:10:26 - error TS2307: Cannot find module 'moment' or its corresponding type declarations.

10 import * as _moment from 'moment';
                            ~~~~~~~~

The package.json file for those examples do not seem to specify "moment" as a dependency.

Example project created using the Edit in StackBlitz button:
https://stackblitz.com/edit/angular-material-datepicker-missing-dep

If I download the project files locally and try to run it with npm install && npm start, I’m getting the same error. So it looks like a problem with the project files, especially its package.json, rather than a problem with StackBlitz's package manager.

I haven't checked every single example, but found one myself and there's a report about a second one in stackblitz/webcontainer-core#728, so it might be good to check the dependencies for all the datepicker examples that use moment.

Affected documentation page

https://material.angular.io/components/datepicker/overview

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