Add react-native-web to the template

[raarts]

yarn web will now start webpack-dev-server, which will show the same screen as the ios/android apps.
yarn build will build for production (into public/assets).

Note this install expo-web as a dependency, and babel-plugin-expo-web to replace all instances of import { .... } from 'expo' with import { .... } from 'expo-web'.

[brentvatne]

no need to scope with ./node_modules here, we can just do webpack-dev-server

[brentvatne]

the direction of this looks great. one request which may complicate things a bit but I think is important to keep this as an opt-in feature until it stabilizes — could we possibly put it under a flag? so create-react-native-app raarts-app --with-web-support for example would be amazing

[brentvatne]

ideally we would hide the webpack config but I think web support isn't at a level of maturity where we can get away with that yet. I'm going to land this and publish it in a pre-release so more people can play with it. thanks!

[necolas]

FWIW I think Metro is supposed to support bundling for web now (and code-splitting at some point). So you might be able to rely on the same bundler for all platforms pretty soon.

[sanderlooijenga]

After the creating the native app with this argument, and ejecting it, I do have some problems when running npm run ios, due to;

error: bundling failed: Error: Unable to resolve module ./App from …

Did somebody else have this issue as well?