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return-undefined: Treat a function returning void | undefined as returning void
#2731
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PR checklist
Overview of change:
This matters if you define a function of type
<T>(callback: () => T | undefined)so that you can sometimes use it as void but sometimes use it to return a value.Also enables
return-undefinedin the tslint repository.CHANGELOG.md entry:
[rule-change]
[bugfix]
return-undefined: Treat a return typevoid | undefinedsame asvoid