`convertLegacyUtilityTypes` codemod replaces types with others from a random file

[mwiencek]

Flow version: 0.312.0

Not sure if this is an issue with codemods in general or just the convertLegacyUtilityTypes one, but it seems to be completely broken (see the linked repo).

It doesn't always take the types from A.js. It may randomly take the types from B.js or C.js instead.

• Link to Try-Flow or Github repo: https://github.com/mwiencek/flow-codemod-issue

[hiSandog]

For a codemod, nondeterministic source selection is especially risky because it can silently rewrite valid code to a different module's type. A minimized fixture with two files exporting the same legacy utility type names would be valuable, with the assertion that replacements are resolved from the local file/import graph deterministically. That would catch both this codemod and any shared codemod helper that is using a global name map.