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There is a TypeScript, Babel, React, and Karma Sample.
The Webpack config contains babel-loader with ts-loader for .tsx? files.
Please explain why it is needed? Why isn't ts-loader enough?
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By using babel's support for TypeScript, you get the ability to work with existing build pipelines and are more likely to have a faster JS emit time because Babel does not type check your code.
As a work-around, we can use babel-loader to compile TypeScript.
babel-loader exposes a loader-builder utility that allows users to add custom handling of Babel's configuration for each file that it processes.
ts-loader: convert typescript (es6) to javascript (es6)
babel-loader: converts javascript (es6) to javascript (es5) and Typescript doesn't do polyfills, which babel does. If you write client-side code in es6 and want it to run on modern browsers, you'd probably need babel's polyfills.
It is less justified with server-side code - just use the latest node version for es6 support. But babel still provides some goodies that tsc doesn't - like caching, or a huge range of plugins that can be very useful.
It's not necessary but a practice for using them all together.
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