error TS7016: Could not find a declaration file for module '@angular/common/locales/xx_XX" angular 5.1.2

I’m submitting a…

[X] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

I updated my project to 5.1.2 and when I try to compile the project I’m getting an error message because the declarations files for the locales are missing and typescript won’t compile.

Expected behavior

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Environment

Angular version: X.Y.Z

Angular 5.1.2

Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[IgorMinar]

we will not cut an npm release until after holidays, so if you are affected by this regression you can in the meantime get a build from our CI using yarn upgrade angular/common-builds#5.1.x (works with npm as well) which will pull it from https://github.com/angular/common-builds/tree/5.1.x (the build will be there after https://travis-ci.org/angular/angular/builds/320557745 or later job completes)

[ocombe]

@davidcruy the documentation should not be changed, it’s a regression and we will revert this, thanks for reporting