diff --git a/firebase.json b/firebase.json
index 03829c71..4caf18e7 100644
--- a/firebase.json
+++ b/firebase.json
@@ -3,6 +3,20 @@
     "rules": "firestore.rules",
     "indexes": "firestore.indexes.json"
   },
+  "functions": [
+    {
+      "source": "functions",
+      "ignore": [
+          "node_modules",
+          ".git",
+          "firebase-debug.log",
+          "firebase-debug.*.log"
+      ],
+      "predeploy": [
+          "npm --prefix \"$RESOURCE_DIR\" run build"
+      ]
+    }
+  ],
   "hosting": {
     "public": "public",
     "ignore": ["firebase.json", "**/.*", "**/node_modules/**"],