Add web support

Author: phamfoo

example/package.json

@@ -17,6 +17,7 @@
   },
   "devDependencies": {
     "@babel/core": "~7.9.0",
+    "@expo/webpack-config": "^0.12.52",
     "@types/react": "~16.9.35",
     "@types/react-dom": "~16.9.8",
     "@types/react-native": "~0.63.2",

example/webpack.config.js

@@ -0,0 +1,25 @@
+const path = require('path')
+const createExpoWebpackConfigAsync = require('@expo/webpack-config')
+const { resolver } = require('./metro.config')
+
+const root = path.resolve(__dirname, '..')
+const node_modules = path.join(__dirname, 'node_modules')
+
+module.exports = async function (env, argv) {
+  const config = await createExpoWebpackConfigAsync(env, argv)
+
+  config.module.rules.push({
+    test: /\.(js|jsx|ts|tsx)$/,
+    include: path.resolve(root, 'src'),
+    use: 'babel-loader',
+  })
+
+  // We need to make sure that only one version is loaded for peerDependencies
+  // So we alias them to the versions in example's node_modules
+  Object.assign(config.resolve.alias, {
+    ...resolver.extraNodeModules,
+    'react-native-web': path.join(node_modules, 'react-native-web'),
+  })
+
+  return config
+}