a few changes to make A/B testing easier

build/generate_asset_map.js

@@ -0,0 +1,19 @@
+const fs = require('fs');
+const path = require('path');
+
+function kv(f) {
+  return `"${f}": require('../assets/${f}')`;
+}
+
+module.exports = function() {
+  const files = fs.readdirSync(path.join(__dirname, '..', 'assets'));
+  const code = `module.exports = {
+    "package.json": require('../package.json'),
+    ${files.map(kv).join(',\n')}
+  };`;
+  return {
+    code,
+    dependencies: files.map(f => require.resolve('../assets/' + f)),
+    cacheable: false
+  };
+};