No, there is almost no re-work needed between version 2 and 6. There are
some breaking changes, but those should be easy to fix, and have only low
impact. And they occur only if you did some special stuff with
injection-tokens. Some of the I18n stuff did change also. When you used a
lot of this, you might have a couple of hours extra work. If you are in a
project of this size, you probably have automated tests. It's a good idea
to rerun those. Retesting your app is a good idea on every release.
On a medium sized app (200K lines) there is usually less as a day work to
upgrade it to a new version.
Things might be a tad more work if you are on an older beta or release
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