Try yarn workspaces

.gitignore

@@ -1,3 +1,5 @@
 .DS_Store
 
 .vercel
+node_modules
+yarn.lock

common/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "mantic-common",
+  "name": "common",
   "private": true,
   "scripts": {},
   "dependencies": {

package.json

@@ -0,0 +1,12 @@
+{
+  "name": "mantic",
+  "private": true,
+  "workspaces": [
+    "common",
+    "functions",
+    "web"
+  ],
+  "scripts": {},
+  "dependencies": {},
+  "devDependencies": {}
+}

web/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "mantic",
+  "name": "web",
   "private": true,
   "scripts": {
     "dev": "concurrently -n NEXT,TS -c magenta,cyan \"next dev -p 3000\" \"yarn ts --watch\"",