TS 3.8 is used, but does not work.

Bug

The latest version of this template uses Typescript 3.8.3. TS 3.8 has a few new features: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html

For instance the “Top-Level await” feature does not work using this template. The template should either not use TS 3.8 or make sure all features work.

Environment info

react-native info output:

System:
    OS: macOS 10.15.4
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 103.57 MB / 16.00 GB
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 12.14.1 - ~/.nvm/versions/node/v12.14.1/bin/node
    Yarn: 1.22.0 - ~/.nvm/versions/node/v12.14.1/bin/yarn
    npm: 6.13.4 - ~/.nvm/versions/node/v12.14.1/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.9.0 - /usr/local/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 13.4, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
    Android SDK:
      API Levels: 28, 29
      Build Tools: 28.0.3, 29.0.2
      System Images: android-27 | Google Play Intel x86 Atom, android-28 | Google APIs Intel x86 Atom, android-29 | Google APIs Intel x86 Atom
      Android NDK: Not Found
  IDEs:
    Android Studio: 3.6 AI-192.7142.36.36.6308749
    Xcode: 11.4/11E146 - /usr/bin/xcodebuild
  Languages:
    Java: 1.8.0_242 - /usr/bin/javac
    Python: 2.7.16 - /usr/bin/python
  npmPackages:
    @react-native-community/cli: Not Found
    react: 16.11.0 => 16.11.0 
    react-native: 0.62.1 => 0.62.1 
  npmGlobalPackages:
    *react-native*: Not Found

Steps To Reproduce

1. npx react-native init MyApp --template react-native-template-typescript
2. Copy top level await example from https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html to App.tsx …

Describe what you expected to happen:

1. TS 3.8 features to work

Reproducible sample code

not needed i think since the repo steps are so simple.

[radko93]

@Guuz this is unfortunately not possible to do fix for us as it’s related to the metro bundler https://github.com/facebook/metro/issues/522

[Guuz]

I’ll leave that decision up to you! 😃 you can close this issue if you want. It has served its purpose i think.