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Most developers should be able to simply update their dependencies and rebuild. A few APIs have been deprecated, but they continue to exist and can be removed at a developer's leisure, per our versioning policy [0]

http://angularjs.blogspot.com/2016/10/versioning-and-releasi...

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Lol, if only the real world were that simple. I have an Angular 2.4 project that when updated to 4.0.0 produces about 300+ build time errors (guess you can't access `private` members from templates anymore, it'll be fuuuuuun updating every component and template to work with "backwards" compatible v4), but basically every other version of Angular breaks your code so you just sorta have to live with it.

That didn't change between Angular 2 and Angular 4 - but maybe you changed your build process and are now running AoT with error checking? That would explain why your templates are now error checked and were not before.

Is that enabled by default in 4? I use and identical AOT build process with 2.4 and 4 (ng-cli) and there's no problems building with 2.4

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