Windsurf
integration
NPM Conflicting Peer Dependencies in Windsurf Project
Running npm install in your Windsurf-generated project fails with ERESOLVE peer dependency conflict errors. Cascade added packages that require incompatible versions of shared dependencies, and npm cannot resolve a valid dependency tree.
This is one of the most frustrating issues in Node.js projects because it blocks all progress — you can't install any packages until the conflict is resolved. The error messages are dense and confusing, listing multiple packages and version ranges that seem impossible to untangle.
The problem typically appears after Cascade adds a new package, when upgrading an existing package, or when combining packages that Cascade recommended in different sessions without checking compatibility.
Error Messages You Might See
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! Could not resolve dependency: peer react@"^17.0.0" from package@1.0.0
npm ERR! Conflicting peer dependency: react@17.0.2
npm ERR! Fix the upstream dependency conflict
npm WARN overriding peer dependency
Common Causes
- React version conflicts — One package requires React 17 while another requires React 18, or a package needs React as a peer dependency but the project uses a different version
- Multiple UI library versions — Cascade installed both an old and new version of the same UI library (e.g., Material UI v4 and v5)
- Outdated packages — Cascade recommended packages with peer dependencies pinned to old versions that conflict with your current stack
- TypeScript version mismatch — Different packages require different TypeScript versions as peer dependencies
- Using --legacy-peer-deps as a band-aid — Previous installs used --legacy-peer-deps to hide conflicts, creating an unstable node_modules that eventually breaks
How to Fix It
- Read the error carefully — npm's ERESOLVE error tells you exactly which packages conflict and what versions they need. Identify the root conflicting dependency
- Check if packages have compatible versions — Often updating one conflicting package to its latest version resolves the peer dependency conflict
- Use npm ls to inspect the tree — Run npm ls [package-name] to see which versions are installed and which packages depend on them
- Remove and reinstall — Delete node_modules and package-lock.json, then run npm install fresh. This often resolves phantom conflicts from corrupted lock files
- Use overrides for stubborn conflicts — Add an "overrides" field in package.json to force a specific version of the conflicting peer dependency
- Avoid --force and --legacy-peer-deps — These flags hide the problem but can cause runtime errors. Only use them as a last resort after understanding the implications
Real developers can help you.
Meïr Ankri
Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
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I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
rayush33
JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
Anthony Akpan
Developer with 8 years of experience building softwares fro startups
Antriksh Narang
5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
Jen Jacobsen
I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses.
I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain.
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
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Get HelpFrequently Asked Questions
Is it safe to use --legacy-peer-deps?
It's a temporary workaround, not a fix. --legacy-peer-deps tells npm to ignore peer dependency conflicts, which may cause runtime errors if the packages are truly incompatible. Use it only to unblock yourself while you find a proper resolution.
What are peer dependencies and why do they cause conflicts?
Peer dependencies are packages that a library expects YOU to install (like React for a React component library). Conflicts happen when two libraries expect different versions of the same peer dependency. Only one version can exist in your project.