I think the typical case to assume that effort is if in your company there are two different frameworks (or more) and you need to build a new application that has some parts with legacy code and the new projects are with React for example.
For example when you log into Amazon or Paypal sometimes you navigate to a screen that looks very legacy, imagine that scenario in an app that you can't navigate completely to "somewhere else", there I think it becomes very useful.
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I think the typical case to assume that effort is if in your company there are two different frameworks (or more) and you need to build a new application that has some parts with legacy code and the new projects are with React for example.
For example when you log into Amazon or Paypal sometimes you navigate to a screen that looks very legacy, imagine that scenario in an app that you can't navigate completely to "somewhere else", there I think it becomes very useful.