How to fix npm WARN unmet peer dependency: typescript@>=4.0.0 in npm

npmBEGINNERLOW

A package needs a peer that is absent or incompatible. Install the required peer within the range or update the dependent package.

What this error means

Unmet peer dependency means npm detected peers that are not satisfied. While installs may continue, the package may malfunction until the peer is provided.

Typical symptoms

npm WARN unmet peer dependency: <pkg>@<range>
Runtime plugin errors about missing/unsupported peer

Common causes

Peer package not installed
Installed peer outside supported range

How to fix "npm WARN unmet peer dependency: typescript@>=4.0.0"

1Install or align the peer package

Add the required peer at a compatible version:

bash

npm install typescript@">=4.0.0"

2Upgrade the package requiring the peer

Use a newer version that supports your peer version if you cannot downgrade the peer.

3Reinstall to update lockfile and dedupe

Clean and reinstall to settle versions:

bash

rm -rf node_modules package-lock.json
npm install

Advanced notes

Prefer resolving peers properly instead of suppressing warnings. In workspaces, ensure peers are hoisted or declared at the root so all packages see the same version.

Related errors

Official resources & further reading

📚npm Official Documentation
📖
npm Docs: peerDependencies(Official Docs)
💬
Stack Overflow: unmet peer dependency(Stack Overflow)
🐙
npm/npm#18381 - peer dependency warnings(GitHub)