1---
2title: Use Single Dependency Versions Across Monorepo
3impact: MEDIUM
4impactDescription: avoids duplicate bundles, version conflicts
5tags: monorepo, dependencies, installation
6---
7 
8## Use Single Dependency Versions Across Monorepo
9 
10Use a single version of each dependency across all packages in your monorepo.
11Prefer exact versions over ranges. Multiple versions cause duplicate code in
12bundles, runtime conflicts, and inconsistent behavior across packages.
13 
14Use a tool like syncpack to enforce this. As a last resort, use yarn resolutions
15or npm overrides.
16 
17**Incorrect (version ranges, multiple versions):**
18 
19```json
20// packages/app/package.json
21{
22  "dependencies": {
23    "react-native-reanimated": "^3.0.0"
24  }
25}
26 
27// packages/ui/package.json
28{
29  "dependencies": {
30    "react-native-reanimated": "^3.5.0"
31  }
32}
33```
34 
35**Correct (exact versions, single source of truth):**
36 
37```json
38// package.json (root)
39{
40  "pnpm": {
41    "overrides": {
42      "react-native-reanimated": "3.16.1"
43    }
44  }
45}
46 
47// packages/app/package.json
48{
49  "dependencies": {
50    "react-native-reanimated": "3.16.1"
51  }
52}
53 
54// packages/ui/package.json
55{
56  "dependencies": {
57    "react-native-reanimated": "3.16.1"
58  }
59}
60```
61 
62Use your package manager's override/resolution feature to enforce versions at
63the root. When adding dependencies, specify exact versions without `^` or `~`.
64