njames93 added a comment.

Can you explain the reasoning of why this approach is better than current 
approach where checks can use global 
options(`Options.getLocalOrGlobal("HeaderFileExtensions", 
utils::defaultHeaderFileExtensions())`) to access the same information?

Some checks also have the global option `ImplementationFileExtensions`, what's 
the proposal with that. Should checks that use this functionality carry on like 
that, use a negative match of this proposed option or should we also add that 
option to the `ClangTidyOptions`.

What is the migration plan for code-bases that currently use the old 
check-based option? We can't break their existing configs, likewise we have to 
be careful of projects with checked-in .clang-tidy files that make use of this 
new option when maintainers may still have an older version of clang-tidy.

Finally, Why would you make the option a semicolon delimited string. The only 
reason that's used for the current `CheckOptions` is there isn't currently a 
better alternative, For `ClangTidyOptions` we could set the type to be an 
`Optional<std::vector<std::string>>`. This would be more natural when writing 
the yaml file.

  HeaderFileExtensions: [ h, hh, hxx, hpp, "" ]
  # Or
  HeaderFileExtensions:
    - h
    - hh
    - hxx
    - hpp
    - ""




Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D141000/new/

https://reviews.llvm.org/D141000

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