I work on a large older codebase that we decided to convert to TypeScript. While it has taken us some time to get there, we are at probably 95% TypeScript, and the rest should be taken care of within a month. It is definitely possible, and is easier to do the more you realize it helps you with code quality and developer happiness. It went from being a chore to being an exciting thing to convert a file over here and there.
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I work on a large older codebase that we decided to convert to TypeScript. While it has taken us some time to get there, we are at probably 95% TypeScript, and the rest should be taken care of within a month. It is definitely possible, and is easier to do the more you realize it helps you with code quality and developer happiness. It went from being a chore to being an exciting thing to convert a file over here and there.