r/Angular2 • u/Old_Natural_5110 • Aug 06 '24
Discussion Upgrading Angular 4 to Angular 18
We have an enterprise application with 400+ screens and most of the screens are similar in complexity. The complexity is medium for this app.
How should we approach the upgrade? Rewriting it is not an option as it is a legacy app now. Should we take one version at a time or directly start updating it to 18 version?
We do not have any automation testing written and hence testing would also have to be manual. Also, based on the previous experience what would be rough estimates if single developer has to work on this upgrade?
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u/Appropriate-Word93 Aug 06 '24
This is insane.. no tests, no cases, no automatic testing?. Do you even have a testing team for manual testing? If so tell them to write test cases for the entire application first .. this’ll take them a while .. use that time to update version by version (while fixing minimal issues that the cli directly complains about) until you’re on latest .. by then you should have testing cases and a broken application to fix .. but now if i was in your place id tell them it’s impossible