Bolt deployment

Dependency Version Conflict - Incompatible Package Versions

npm install fails or warns about version conflicts. Packages require different versions of the same dependency.

Error: 'peer dep missing' or 'conflicting peer deps'

Error Messages You Might See

npm ERR! peer dep missing: requires react@17 npm WARN: peer dependencies not satisfied conflicting peer dependency: react Incompatible dependencies detected
npm ERR! peer dep missing: requires react@17npm WARN: peer dependencies not satisfiedconflicting peer dependency: reactIncompatible dependencies detected

Common Causes

  1. Two packages require different major versions of same dependency
  2. Peer dependency mismatch - library requires React 17 but you have 18
  3. npm version changed how it handles peer deps (npm 8+ is stricter)
  4. Dependency not compatible with Node version
  5. Outdated package not updated to support new dependencies

How to Fix It

Check what's conflicting: npm list [package-name]

Update package: npm update package-name@latest

If incompatible: remove older package and install newer

Force install (risky): npm install --legacy-peer-deps

Better: find package compatible with your versions or replace with alternative

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Frequently Asked Questions

When should I use --legacy-peer-deps?

As temporary workaround only. Better to update packages to compatible versions. Don't commit with this flag

What's a peer dependency?

Library expects to use your version of a package (React, etc). You install it, library reuses it

How do I check all dependencies?

npm list shows tree. npm ls --depth=0 shows top level. npm outdated shows what can update

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