It's easier to plug it in because there's a lot of projects already using babel, so you just need to add a transformer. Previously you'd need to add a new step

It's easier to plug it in because there's a lot of projects already using babel, so you just need to add a transformer. Previously you'd need to add a new step to your compilation process using tsc, which could be very difficult depending on how you built your project, especially if it wasn't Webpack-based. For example, you _could_ use TypeScript before with React Native. But it was convoluted: there were 3 different way to do it, none of them perfect, and all really brittle. But with Babel 7, you just add another transformer to your babel file and bam, it's treated as a first class citizen. It's literally a one line change.