react-native-javascript-environment-typescript

WITHOUT using @babel/runtime

WITHOUT using @babel/runtime

WITHOUT using @babel/runtime

The JavaScript environment running your code is not a fully ES2015 environment but specified in JavaScript Environment.

Even the documentation does not tell you Map and Set are polyfilled.

The exact applied polyfill are

1. https://github.com/facebook/react-native/blob/v0.57.7/Libraries/Core/InitializeCore.js#L41
2. https://github.com/facebook/react-native/tree/v0.57.7/Libraries/polyfills

Therefore, if you configure --lib to include ES2015 or even higher AND do not use @babel/runtime, you are lying to yourself that you can use all ES2015+ runtime features.

The type definition is valid for React Native >= 0.57.

The type definition itself is copied from TypeScript repository.

Usage

1. In tsconfig.json, set lib to ["ES5", "ES2015.Promise", "ES2015.Collection", "ES2016.Array.Include"].
2. In tsconfig.json, add "./node_modules/@oursky/react-native-javascript-environment-typescript/index.d.ts" to "files".