allowJs option in tsconfig should be suggested to be false

[yang]

Currently, CRA suggests allowJs in tsconfig to be true. But, together with isolatedModules, this causes problems whenever there are .js files in the codebase. Specifically it causes microsoft/TypeScript#15230: "Cannot compile namespaces when the '--isolatedModules' flag is provided."

.js files can be introduced naturally a number of ways, e.g. by following instructions to add setupTests.js, setupProxy.js, etc., or by tools that generate .js files (e.g. protobuf, pegjs, etc.).

I think this is not needed because TS is only used for typechecking and not transpilation. Babel and webpack together already make sure to include any imported/required .js files in the output bundle.

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[yang]

This is still an open issue.

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