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Sigh. Types are very important for the front-end. Have you ever tried to validate the data going to the backend? Well then you're using types except you've implemented your own bug-ridden and gimped version of typechecking that already exists in flow and typescript. So just annotate your code. Both typescript and flow work with mixed code bases where some parts are annotated and some parts are not and there is clear benefit to even a half annotated code base. Typescript even has support for JSX.

Not to mention that any front-end code will invariably have a domain model and interactions that are much better expressed with typescript than vanilla modern javascript. The refactoring and basic validations you get by even a few annotation is just too good to pass up. I no longer write any javascript that doesn't pass through the typescript compiler/typechecker.




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