* Switch to Yarn (#15485)
* switch to yarn
* cleanup misc references to npm
* [yarn] loosen dependency ranges so yarn will merge more deps
* fix linting error now that moment uses ESM
* [licenses] font-awesome changed the format of its license id
* Use local yarn
* Misc fixes
* eslintignore built yarn file
* Remove mkdir which doesn't do what it should do
* Check build without upgrading lots of versions
* Fix license check
* too many moments
* Better description
* Review fixes
* Lock to angular@1.6.5
* More specific version locks
* Revert "More specific version locks"
This reverts commit 11ef81102e.
* Revert "Lock to angular@1.6.5"
This reverts commit 3ade68c14c.
* rm yarn.lock; yarn
* Forcing a specific version of React, Angular, Moment
* Using vendored version of yarn in ci
* Use --frozen-lockfile
* fixes
* Update lockfile
