I use JavaScript ES6 in my personal projects but TypeScript at work.
I suggest to use TypeScript in larger projects, especially when multiple developers are involved. It makes it just easier to use the code of others when you use a static typed language.
For me, the biggest drawback of TypeScript is the additional transpilation step into JavaScript. That can be really tedious if you work with large React projects.
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I use JavaScript ES6 in my personal projects but TypeScript at work.
I suggest to use TypeScript in larger projects, especially when multiple developers are involved. It makes it just easier to use the code of others when you use a static typed language.
For me, the biggest drawback of TypeScript is the additional transpilation step into JavaScript. That can be really tedious if you work with large React projects.