This is the minimal possible setup to get a in memory version of React Native working with TypeScript support. The current techniques use a multi-step process, you save -> TypeScript creates JS file -> Babel sees JS file and compiles to ES5. This replaces that with a custom transformer that will either pass the file to Babel or the TypeScript compiler.

If you want to see a non-trivial production version: https://github.com/artsy/emission

This repo is the techniques inside that app replicated against a new project.

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Steps required to make this project:

• npm install -g react-native-cli
• react-native init MyProject
• cd MyProject
• yarn add typescript --dev
• yarn tsc -- --init
• change tsconfig.json:

{
  "compilerOptions": {
    "target": "es5",  
    "module": "commonjs",
    "jsx": "react", 
    "strict": true  
  }
}

• create - rn-cli.config.js

module.exports = {
  getSourceExts() {
    return ["js", "ts", "tsx"]
  },

  getTransformModulePath() {
    return require.resolve("./transformer")
  },
}

• create transformer folder, and copy emission files in there (https://github.com/artsy/emission/tree/master/transformer)
• You have to keep index.ios.js index.android.js to use those to load a TSX component, in this case home.tsx
• react-native run-ios to start it up

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Making it feel good:

• yarn add @types/react-native --dev