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And it prevents 100% of the time wasted on testing something in a browser (or generally at runtime) only for it to fail for some trivial type mismatch.

These things don't typically make it as bugs into production code but are a big time sink with dynamic languages.

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I would really like a "strict mode" on my browser developer tools that would cause any problem in Javascript to stop everything on the page and write a huge "Hey, your code can not run because it had a parsing error at this line!" at the console.

Eslint and a Webpack dev server would have you covered in that regard.

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