diff --git a/build-scripts/env.js b/build-scripts/env.js
index fa4d0727f3..72a9e794d2 100644
--- a/build-scripts/env.js
+++ b/build-scripts/env.js
@@ -1,3 +1,7 @@
+const fs = require("fs");
+const path = require("path");
+const paths = require("./paths.js");
+
 module.exports = {
   isProdBuild() {
     return process.env.NODE_ENV === "production";
@@ -11,4 +15,13 @@ module.exports = {
   isNetlify() {
     return process.env.NETLIFY === "true";
   },
+  version() {
+    const version = fs
+      .readFileSync(path.resolve(paths.polymer_dir, "setup.py"), "utf8")
+      .match(/\d{8}\.\d+/);
+    if (!version) {
+      throw Error("Version not found");
+    }
+    return version[0];
+  },
 };
diff --git a/build-scripts/webpack.js b/build-scripts/webpack.js
index 3fefd3ed05..c8b244354c 100644
--- a/build-scripts/webpack.js
+++ b/build-scripts/webpack.js
@@ -1,20 +1,12 @@
 const webpack = require("webpack");
-const fs = require("fs");
 const path = require("path");
 const TerserPlugin = require("terser-webpack-plugin");
 const WorkboxPlugin = require("workbox-webpack-plugin");
 const ManifestPlugin = require("webpack-manifest-plugin");
 const paths = require("./paths.js");
+const env = require("./env.js");
 const { babelLoaderConfig } = require("./babel.js");
 
-let version = fs
-  .readFileSync(path.resolve(paths.polymer_dir, "setup.py"), "utf8")
-  .match(/\d{8}\.\d+/);
-if (!version) {
-  throw Error("Version not found");
-}
-version = version[0];
-
 const createWebpackConfig = ({
   entry,
   outputRoot,
@@ -71,7 +63,7 @@ const createWebpackConfig = ({
       new webpack.DefinePlugin({
         __DEV__: !isProdBuild,
         __BUILD__: JSON.stringify(latestBuild ? "latest" : "es5"),
-        __VERSION__: JSON.stringify(version),
+        __VERSION__: JSON.stringify(env.version()),
         __DEMO__: false,
         __BACKWARDS_COMPAT__: false,
         __STATIC_PATH__: "/static/",
@@ -193,7 +185,7 @@ const createDemoConfig = ({ isProdBuild, latestBuild, isStatsBuild }) => {
     },
     outputRoot: paths.demo_root,
     defineOverlay: {
-      __VERSION__: JSON.stringify(`DEMO-${version}`),
+      __VERSION__: JSON.stringify(`DEMO-${env.version()}`),
       __DEMO__: true,
     },
     isProdBuild,