diff --git a/generator/src/add-files-plugin.js b/generator/src/add-files-plugin.js
new file mode 100644
index 00000000..99d8016f
--- /dev/null
+++ b/generator/src/add-files-plugin.js
@@ -0,0 +1,23 @@
+const path = require("path");
+
+module.exports = class AddFilesPlugin {
+  constructor(filesList) {
+    this.filesList = filesList;
+  }
+  apply(compiler) {
+    compiler.hooks.afterCompile.tap("AddFilesPlugin", compilation => {
+      this.filesList.forEach(file => {
+        // Couldn't find this documented in the webpack docs,
+        // but I found the example code for it here:
+        // https://github.com/jantimon/html-webpack-plugin/blob/35a154186501fba3ecddb819b6f632556d37a58f/index.js#L470-L478
+
+        const filename = path.join(file.name, "content.txt");
+        compilation.fileDependencies.add(filename);
+        compilation.assets[filename] = {
+          source: () => file.content,
+          size: () => file.content.length
+        };
+      });
+    });
+  }
+};
diff --git a/generator/src/develop.js b/generator/src/develop.js
index 677cc910..a7b6eed6 100644
--- a/generator/src/develop.js
+++ b/generator/src/develop.js
@@ -9,28 +9,7 @@ const merge = require("webpack-merge");
 const { GenerateSW } = require("workbox-webpack-plugin");
 const FaviconsWebpackPlugin = require("favicons-webpack-plugin");
 const webpackDevServer = require("webpack-dev-server");
-
-class AddFilesPlugin {
-  constructor(filesList) {
-    this.filesList = filesList;
-  }
-  apply(compiler) {
-    compiler.hooks.afterCompile.tap("AddFilesPlugin", compilation => {
-      this.filesList.forEach(file => {
-        // Couldn't find this documented in the webpack docs,
-        // but I found the example code for it here:
-        // https://github.com/jantimon/html-webpack-plugin/blob/35a154186501fba3ecddb819b6f632556d37a58f/index.js#L470-L478
-
-        const filename = path.join(file.name, "content.txt");
-        compilation.fileDependencies.add(filename);
-        compilation.assets[filename] = {
-          source: () => file.content,
-          size: () => file.content.length
-        };
-      });
-    });
-  }
-}
+const AddFilesPlugin = require("./add-files-plugin.js");
 
 module.exports = { start, run };
 function start({ routes, debug, manifestConfig }) {