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This has not been my experience at all. TypeScript's tooling is great, it's interoperability with non-TypeScript code is a non-issue. You're drastically overstating how different it is from an ES6 toolchain.

Also remember that TypeScript is very forgiving if you decide to avoid types in some part of your codebase. However, I will tell you that I always end up regretting not using types when I come back to the code in 6 months.

> Library authors opting for TS may well be closing door for contributors from mainstream dev demographic.

I think it's the complete opposite. Good typings make it easier for new contributors to get up to speed, make changes without breaking anything, and document those changes. Furthermore, it makes it significantly easier to push out new versions of your libraries since TypeScript will help users debug breaking changes.

I say ease of debugging is not there. Spotting API breakages in case of type changes in them is one of very few advantages on debugging side.

Just as with as with any transpiler, you never have 100% confidence in your source maps, especially if you mix and match your tooling.

And you almost always loose some part of native debugger functionality in browser or node. I never ever saw a transpiler that does not break correct display of properties along the prototype chain or breakpoints inside constructor functions.

This is where vanilla es6 blows everything away. I know not so few dotcom tier companies with 1m+ per hour websites which stick with handwritten JS on the frontend solely because of that: productivity gains for them simply not worth losing few percents of visitors because of hard to catch and debug bugs.

I am completely unconvinced by this argument. Who's shipping un-minified, un-transpiled, un-bundled ES6? And even if you were, TypeScript is just a superset of ES6, to the point where there's even a babel plugin to simply strip the types leaving you with regular ES6 JavaScript. I don't believe that the addition of TypeScript would add any debugging burden to an existing ES6 project.

It's not like we're compiling Haskell to JavaScript, I've never had trouble debugging because of differences between TypeScript and my build output. I honestly don't even think about it.

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