feat(posts): add "Fix npm error ERESOLVE could not resolve"

Post: 2024-10-24-fix-npm-error-eresolve-could-not-resolve.md

_posts/2024/2024-10-24-fix-npm-error-eresolve-could-not-resolve.md

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+---
+layout: post
+title: Fix npm error ERESOLVE could not resolve
+date: 2024-10-24 23:06:44
+excerpt: How to fix npm error ERESOLVE could not resolve
+categories: npm
+---
+
+This post goes over how to fix npm error `ERESOLVE could not resolve`.
+
+## Problem
+
+If there's an npm dependency conflict, `npm install` will throw an error:
+
+```sh
+npm install
+```
+
+```
+npm error code ERESOLVE
+npm error ERESOLVE could not resolve
+npm error
+npm error While resolving: [email protected]
+npm error Found: [email protected]
+npm error node_modules/firebase
+npm error   firebase@"11.0.1" from the root project
+npm error
+npm error Could not resolve dependency:
+npm error peer firebase@"^9.1.3 || ^10.0.0" from [email protected]
+npm error node_modules/firebaseui
+npm error   firebaseui@"6.1.0" from the root project
+npm error
+npm error Conflicting peer dependency: [email protected]
+npm error node_modules/firebase
+npm error   peer firebase@"^9.1.3 || ^10.0.0" from [email protected]
+npm error   node_modules/firebaseui
+npm error     firebaseui@"6.1.0" from the root project
+npm error
+npm error Fix the upstream dependency conflict, or retry
+npm error this command with --force or --legacy-peer-deps
+npm error to accept an incorrect (and potentially broken) dependency resolution.
+```
+
+## Solution
+
+A temporary workaround is to install with `--force`:
+
+```sh
+npm install --force
+```
+
+Or with `--legacy-peer-deps`:
+
+```sh
+npm install --legacy-peer-deps
+```
+
+However, a better solution is to use [overrides](https://docs.npmjs.com/cli/v10/configuring-npm/package-json#overrides):
+
+```json
+{
+  "overrides": {
+    "your-dependency": "1.0.0"
+  }
+}
+```
+
+For example, `firebaseui` depends on a different version of `firebase` so to specify it in overrides:
+
+```json
+{
+  "dependencies": {
+    "firebase": "11.0.1",
+    "firebaseui": "6.1.0"
+  },
+  "overrides": {
+    "firebase": "11.0.1"
+  }
+}
+```
+
+Alternatively, you can use the version from `dependencies`:
+
+```json
+{
+  "dependencies": {
+    "firebase": "11.0.1",
+    "firebaseui": "6.1.0"
+  },
+  "overrides": {
+    "firebase": "$firebase"
+  }
+}
+```