  Developers often change types of program elements. Such refactoring often
involves updating not only the type of the element itself, but also the API of
all type-dependent references in the code, thus it is tedious and
time-consuming. Despite type changes being more frequent than renamings, just a
few current IDE tools provide partially-automated support only for a small set
of hard-coded types. Researchers have recently proposed a data-driven approach
to inferring API rewrite rules for type change patterns in Java using code
commits history. In this paper, we build upon these recent advances and
introduce IntelliTC - a tool to perform Java type change refactoring. We
implemented it as a plugin for IntelliJ IDEA, a popular Java IDE developed by
JetBrains. We present 3 different ways of providing support for such a
refactoring from the standpoint of the user experience: Classic mode, Suggested
Refactoring, and Inspection mode. To evaluate these modalities of using
IntelliTC, we surveyed 22 experienced software developers. They positively
rated the usefulness of the tool.
  The source code and distribution of the plugin are available on GitHub:
https://github.com/JetBrains-Research/data-driven-type-migration. A
demonstration video is on YouTube: https://youtu.be/pdcfvADA1PY.
