diff --git a/.github/workflows/e2e-test.yml b/.github/workflows/e2e-test.yml
index 8344474a56f..40bcb791a80 100644
--- a/.github/workflows/e2e-test.yml
+++ b/.github/workflows/e2e-test.yml
@@ -47,6 +47,10 @@ jobs:
         working-directory: ./config
         env:
           FIREBASE_CLI_TOKEN: ${{ secrets.FIREBASE_CLI_TOKEN }}
+      - name: Do modular build
+        run: yarn build:modular
+      - name: Do compat build
+        run: yarn build:compat
       - name: Run modular tests
         env:
           APP_CHECK_DEBUG_TOKEN: ${{ secrets.APP_CHECK_DEBUG_TOKEN }}
diff --git a/e2e/.gitignore b/e2e/.gitignore
index fcb8904bce8..04d8ee5c56e 100644
--- a/e2e/.gitignore
+++ b/e2e/.gitignore
@@ -1,3 +1,4 @@
 build/*.js
+build/*.map
 firebase-config.js
 context.html
\ No newline at end of file
diff --git a/e2e/package.json b/e2e/package.json
index a5251084fea..0009e2106d8 100644
--- a/e2e/package.json
+++ b/e2e/package.json
@@ -11,7 +11,9 @@
     "watch": "webpack --watch",
     "build": "webpack",
     "start:modular": "webpack serve --config-name modular",
-    "start:compat": "webpack serve --config-name compat"
+    "start:compat": "webpack serve --config-name compat",
+    "build:modular": "webpack --config-name modular",
+    "build:compat": "webpack --config-name compat"
   },
   "author": "",
   "license": "ISC",
diff --git a/e2e/webpack.config.js b/e2e/webpack.config.js
index 38e56dd041b..b2e4c25f62e 100644
--- a/e2e/webpack.config.js
+++ b/e2e/webpack.config.js
@@ -49,9 +49,6 @@ module.exports = [
         }
       ]
     },
-    resolve: {
-      mainFields: ['browser', 'module', 'main']
-    },
     stats: {
       colors: true
     },
@@ -88,9 +85,6 @@ module.exports = [
         }
       ]
     },
-    resolve: {
-      mainFields: ['browser', 'module', 'main']
-    },
     stats: {
       colors: true
     },