diff --git a/client/index.js b/client/index.js
index c918322..0c1c1d0 100644
--- a/client/index.js
+++ b/client/index.js
@@ -14,7 +14,9 @@ import {Room, RoomView} from '@avocado/topdown';
 import {World} from '@avocado/physics/matter/world';
 import {clearAnimation, setAnimation, Ticker} from '@avocado/timing';
 // 1st party.
-import {InputPacket, KeysPacket, StatePacket} from '../common/packet';
+import {InputPacket} from '../common/packet/input.packet';
+import {KeysPacket} from '../common/packet/keys.packet';
+import {StatePacket} from '../common/packet/state.packet';
 import {augmentParserWithThroughput} from '../common/parser-throughput';
 import {WorldTime} from '../common/world-time';
 import {App} from './app';
diff --git a/common/packet/index.js b/common/packet/index.js
deleted file mode 100644
index 999003c..0000000
--- a/common/packet/index.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import {registerPacket} from '@avocado/packet';
-
-import {InputPacket} from './input';
-registerPacket(InputPacket);
-
-import {KeysPacket} from './keys';
-registerPacket(KeysPacket);
-
-import {StatePacket} from './state';
-registerPacket(StatePacket);
-
-export {InputPacket, KeysPacket, StatePacket};
diff --git a/common/packet/input.js b/common/packet/input.packet.js
similarity index 100%
rename from common/packet/input.js
rename to common/packet/input.packet.js
diff --git a/common/packet/keys.js b/common/packet/keys.packet.js
similarity index 100%
rename from common/packet/keys.js
rename to common/packet/keys.packet.js
diff --git a/common/packet/state.js b/common/packet/state.packet.js
similarity index 100%
rename from common/packet/state.js
rename to common/packet/state.packet.js
diff --git a/defgen.js b/defgen.js
index e54b9c5..99a8cdb 100644
--- a/defgen.js
+++ b/defgen.js
@@ -43,9 +43,9 @@ module.exports = function(source) {
   // Validate schema.
   validateOptions(schema, options, 'Avocado defgen');
   // Extract options.
-  const {paths, registrar, type} = options;
+  const {classTransformer: transformer, paths, registrar, type} = options;
   // Search avocado.
-  options.paths.push(path.resolve(
+  paths.push(path.resolve(
     __dirname, 'node_modules', '@avocado',
   ));
   // Get all trait source paths.
@@ -79,16 +79,18 @@ module.exports = function(source) {
       const rest = part.substr(1).toLowerCase();
       return className + firstLetter + rest;
     }, '');
+    const transformed = transformer ? transformer(className) : className;
     // Import and register.
     return [
-      `import {${className}} from '${importPath}';`,
-      `${registrar.function}(${className});`,
+      `import {${transformed}} from '${importPath}';`,
+      `${registrar.function}(${transformed});`,
     ].join('\n');
   });
   // Import trait registry first.
-  return [
+  const output = [
     `import {${registrar.function}} from '${registrar.module}'`,
     '',
     ...importDefinitions
   ].join('\n');
+  return output;
 }
diff --git a/register-packets.js b/register-packets.js
new file mode 100644
index 0000000..e69de29
diff --git a/server/game.js b/server/game.js
index fd4aaac..99e56ef 100644
--- a/server/game.js
+++ b/server/game.js
@@ -6,7 +6,7 @@ import {performance} from 'perf_hooks';
 import {Synchronizer} from '@avocado/state';
 import {Ticker} from '@avocado/timing';
 // 1st party.
-import {InputPacket} from '../common/packet';
+import {InputPacket} from '../common/packet/input.packet';
 import {WorldTime} from '../common/world-time';
 import {createEntityForConnection} from './create-entity-for-connection';
 import {createRoom} from './create-server-room';
diff --git a/server/traits/informed.trait.js b/server/traits/informed.trait.js
index 6a8f16a..abd5180 100644
--- a/server/traits/informed.trait.js
+++ b/server/traits/informed.trait.js
@@ -7,8 +7,8 @@ import {Trait} from '@avocado/entity';
 import {Rectangle, Vector} from '@avocado/math';
 import {Packer, Synchronizer} from '@avocado/state';
 
-import {KeysPacket} from '../../common/packet/keys';
-import {StatePacket} from '../../common/packet/state';
+import {KeysPacket} from '../../common/packet/keys.packet';
+import {StatePacket} from '../../common/packet/state.packet';
 
 const decorate = compose(
 );
diff --git a/webpack.client.config.js b/webpack.client.config.js
index aaab909..45549fb 100644
--- a/webpack.client.config.js
+++ b/webpack.client.config.js
@@ -7,6 +7,7 @@ const config = require('./webpack.common.config');
 config.entry = {
   client: [
     '@babel/polyfill',
+    path.join(__dirname, 'register-packets.js'),
     path.join(__dirname, 'register-traits.js'),
     '@avocado/behavior/item/initialize',
     path.join(__dirname, 'client', 'index.js'),
@@ -37,6 +38,9 @@ config.devtool = 'eval-source-map';
 config.module.rules[1].use.options.paths.push(
   path.resolve(__dirname, 'client'),
 );
+config.module.rules[2].use.options.paths.push(
+  path.resolve(__dirname, 'client'),
+);
 config.node = {
   fs: 'empty',
   path: 'empty',
diff --git a/webpack.common.config.js b/webpack.common.config.js
index 4180bf7..5c94443 100644
--- a/webpack.common.config.js
+++ b/webpack.common.config.js
@@ -16,6 +16,25 @@ const config = {
           loader: 'babel-loader',
         },
       },
+      {
+        test: /register-packets\.js/,
+        use: {
+          loader: './defgen',
+          options: {
+            classTransformer: (Packet) => {
+              return `${Packet}Packet`;
+            },
+            paths: [
+              path.resolve(__dirname, 'common'),
+            ],
+            registrar: {
+              function: 'registerPacket',
+              module: '@avocado/packet',
+            },
+            type: 'packet',
+          },
+        },
+      },
       {
         test: /register-traits\.js/,
         use: {
@@ -26,7 +45,7 @@ const config = {
             ],
             registrar: {
               function: 'registerTrait',
-              module: '@avocado/entity/trait-registry',
+              module: '@avocado/entity',
             },
             type: 'trait',
           },
diff --git a/webpack.server.config.js b/webpack.server.config.js
index 0e77562..32043b3 100644
--- a/webpack.server.config.js
+++ b/webpack.server.config.js
@@ -9,6 +9,7 @@ config.entry = {
   server: [
     'source-map-support/register',
     '@babel/polyfill',
+    path.join(__dirname, 'register-packets.js'),
     path.join(__dirname, 'register-traits.js'),
     '@avocado/behavior/item/initialize',
     path.join(__dirname, 'server', 'index.js'),
@@ -22,6 +23,9 @@ config.externals = [
 config.module.rules[1].use.options.paths.push(
   path.resolve(__dirname, 'server'),
 );
+config.module.rules[2].use.options.paths.push(
+  path.resolve(__dirname, 'server'),
+);
 const nodeArgs = [];
 if (process.argv.find((arg) => '--prof' === arg)) {
   nodeArgs.push('--prof');