[build] add typescript compiler (#2697)

build/webpack.dev.js

@@ -30,7 +30,7 @@ module.exports = {
     }
   },
   resolve: {
-    extensions: ['.js', '.vue', '.css'],
+    extensions: ['.js', '.ts', '.tsx', '.vue', '.css'],
     alias: {
       packages: path.join(__dirname, '../packages')
     }
@@ -51,7 +51,7 @@ module.exports = {
         ]
       },
       {
-        test: /\.js$/,
+        test: /\.(js|ts|tsx)$/,
         exclude: /node_modules/,
         use: 'babel-loader'
       },