chore: include THREE globally for proton.three

webpack.client.config.js

@@ -1,6 +1,7 @@
 const path = require('path');
 
 const HtmlWebpackPlugin = require('html-webpack-plugin');
+const webpack = require('webpack');
 
 const config = require('./webpack.common.config');
 
@@ -48,5 +49,8 @@ config.node = {
 config.plugins.push(new HtmlWebpackPlugin({
   template: path.resolve(__dirname, 'client', 'index.html'),
 }));
+config.plugins.push(new webpack.ProvidePlugin({
+  THREE: 'three',
+}));
 
 module.exports = config;