Migration of Angular 4 project to Angular 5

Migration of Angular 4 project to Angular 5
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#1
  1. What are the major differences in Angular 4 and Angular 5?
  2. How much effort will be required for migrating Angular 4 project to Angular 5
  3. Is there any official documentation available for migration from Angular 4 to Angular 5

#2

Angular 4 -> Angular 5 is pretty chill.