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What does react use typescript and coffescript for? they are listed as a dep in package.json

We just test that their class systems work properly with React:

We don't use either one outside of the tests.

I think that means you can move them to the `devDependencies`.

edit: Derp, they're there already

They already are in devDependencies.

Is it the same case for babel? re: ReactES6Class-test.js

Yes, though we use Babel to compile all of our JS source code and tests.

Will you end up testing a Babelified es6 class and a "native" es6 class, or will you keep testing just the Babelified version for now?

Probably the latter, though we might add a native one too after we run our tests using a version of Node that supports classes.