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From David's e-mail: Having in place both #227193 and #227194 enhancements we could provide ability to upgrade libraries when newer version gets available in CDNJS. We could mark those libraries in the UI and for example added a button "Upgrade" which would show list of upgradable libraries and which versions are available and user could indicate per library which one to upgrade. Or even simpler: current list of "Selected" libraries in "JavaScirpt Files" panel could be turned into table with two columns and version column would be "editable" - meaning that user could not only upgrade but also downgrade if needed. The library would be editable only when package.json file exists for it.
Isn't this done now?
I do not think so. We only allow to download latest list of JS libraries but no special support for outdated project JS libs is done.
Honza will be working on new JS library manager(s). thanks.
npm/bower/CDNJS libraries can be upgraded using the corresponding JS libraries dialog in project properties by now.