Amphtml: AMP extension generator (gulp make-extension) is out of date

[cvializ]

I found that the validation files and some other defaults provided by the AMP extension generator fail to build/behave correctly. We've updated our validator files and patterns for example, and the information in the extension generator is no longer correct.

/to @erwinmombay as owner and for priority triage
/cc @mrjoro for visibility on documentation/cleanup effort

https://github.com/ampproject/amphtml/blob/f06e2b6887294fe8afa9dfd3e88fffe7e8ea1978/build-system/tasks/extension-generator/index.js#L50-L58

[honeybadgerdontcare]

To see what we're advocating now for validation see contributing validation rules.

We tried to simplify the necessary code. Now we have an extension_spec that encapsulates what most extensions need.

[ampprojectbot]

This issue hasn't been updated in awhile. @erwinmombay Do you have any updates?

[honeybadgerdontcare]

Looks like this was updated to the latest https://github.com/ampproject/amphtml/blob/38f4c3244195ed91e56213e519860533dd3fceee/build-system/tasks/extension-generator/index.js#L33