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React 18.3.1 and React 19 dependency compatibility matrix.
Analyze AWS resources used in the app (IaC files and/or resources in a target account/region) and optimize costs - creating GitHub issues for identified optimizations.
Analyze AWS resource health, diagnose issues from CloudWatch logs and metrics, and create a remediation plan for identified problems.
Query AWS resources using natural language. Covers EC2, S3, RDS, Lambda, ECS, EKS, Secrets Manager, IAM, VPC, networking, messaging, and more. Strictly read-only — no writes, deletes, or mutations.
Perform an AWS Well-Architected Framework review of the current workload IaC and architecture, generating findings and GitHub issues for improvements.
Manage DNS records for domains registered with Namecheap via their API. List domains, view/add/update/remove DNS host entries (A, AAAA, CNAME, MX, TXT, etc.), and guide users through API setup including public IP detection and credential configuration. Use when the user mentions Namecheap, DNS records, domain management, or wants to add/change/remove A records, CNAME records, MX records, or TXT records for their domains.
Authoring and debugging scripts for Rhinoceros 3D (Rhino 8 and later). Use when asked to write RhinoScript (VBScript / .rvb / .vbs), RhinoPython, or RhinoCommon-based scripts; automate Rhino modeling tasks; build command macros; manipulate Rhino geometry, layers, blocks, or document objects; pick objects from the viewport; control redraw and undo; or load and run scripts from the Rhino Script Editor. Covers `rhinoscriptsyntax`, `scriptcontext`, the `Rhino.*` RhinoCommon namespaces (`Rhino.Geometry`, `Rhino.DocObjects`, `Rhino.Input`, `Rhino.UI`, `Rhino.Display`, `Rhino.FileIO`), and the Rhino 8 unified Script Editor.
| name | react18-dep-compatibility |
| description | React 18.3.1 and React 19 dependency compatibility matrix. |
Minimum versions required for React 18.3.1 and React 19 compatibility.
Use this skill whenever checking whether a dependency supports a target React version, resolving peer dependency conflicts, deciding whether to upgrade or use legacy-peer-deps, or assessing the risk of a react-router v5 to v6 migration.
Review this matrix before running npm install during a React upgrade and before accepting an npm dependency conflict resolution, especially where concurrent mode compatibility may be affected.
| Package | React 17 (current) | React 18.3.1 (min) | React 19 (min) | Notes |
|---|---|---|---|---|
react | 17.x | 18.3.1 | 19.0.0 | Pin exactly to 18.3.1 for the R18 orchestra |
react-dom | 17.x | 18.3.1 | 19.0.0 | Must match react version exactly |
| Package | React 18 Min | React 19 Min | Notes |
|---|---|---|---|
@testing-library/react | 14.0.0 | 16.0.0 | RTL 13 uses ReactDOM.render internally - broken in R18 |
@testing-library/jest-dom | 6.0.0 | 6.0.0 | v5 works but v6 has React 18 matcher updates |
@testing-library/user-event | 14.0.0 | 14.0.0 | v13 is sync, v14 is async - API change required |
jest | 27.x | 27.x | jest 27+ with jsdom 16+ for React 18 |
jest-environment-jsdom | 27.x | 27.x | Must match jest version |
| Package | React 18 Min | React 19 Min | Notes |
|---|---|---|---|
@apollo/client | 3.8.0 | 3.11.0 | 3.8 adds useSyncExternalStore for concurrent mode |
graphql | 15.x | 16.x | Apollo 3.8+ peer requires graphql 15 or 16 |
Read references/apollo-details.md for concurrent mode issues and MockedProvider changes.
| Package | React 18 Min | React 19 Min | Notes |
|---|---|---|---|
@emotion/react | 11.10.0 | 11.13.0 | 11.10 adds React 18 concurrent mode support |
@emotion/styled | 11.10.0 | 11.13.0 | Must match @emotion/react version |
@emotion/cache | 11.10.0 | 11.13.0 | If used directly |
| Package | React 18 Min | React 19 Min | Notes |
|---|---|---|---|
react-router-dom | v6.0.0 | v6.8.0 | v5 → v6 is a breaking migration - see details below |
react-router-dom v5 | 5.3.4 (workaround) | ❌ Not supported | See legacy peer deps note |
react-router v5 → v6 is a SEPARATE migration sprint. Read references/router-migration.md.
| Package | React 18 Min | React 19 Min | Notes |
|---|---|---|---|
react-redux | 8.0.0 | 9.0.0 | v7 works on R18 legacy root only - breaks on concurrent mode |
redux | 4.x | 5.x | Redux itself is framework-agnostic - react-redux version matters |
@reduxjs/toolkit | 1.9.0 | 2.0.0 | RTK 1.9 tested against React 18 |
| Package | React 18 Min | React 19 Min | Notes |
|---|---|---|---|
react-query / @tanstack/react-query | 4.0.0 | 5.0.0 | v3 doesn't support concurrent mode |
react-hook-form | 7.0.0 | 7.43.0 | v6 has concurrent mode issues |
formik | 2.2.9 | 2.4.0 | v2.2.9 patched for React 18 |
react-select | 5.0.0 | 5.8.0 | v4 has peer dep conflicts with R18 |
react-datepicker | 4.8.0 | 6.0.0 | v4.8+ added React 18 support |
react-dnd | 16.0.0 | 16.0.0 | v15 and below have R18 concurrent mode issues |
prop-types | any | any | Standalone - unaffected by React version |
npm ls shows peer conflict for package X
│
▼
Does package X have a version that supports React 18?
YES → npm install X@[min-compatible-version]
NO ↓
│
Is the package critical to the app?
YES → check GitHub issues for React 18 branch/fork
→ check if maintainer has a PR open
→ last resort: --legacy-peer-deps (document why)
NO → consider removing the package
Only use --legacy-peer-deps when:
Document every --legacy-peer-deps usage in a comment at the top of package.json or in a MIGRATION.md file explaining why it was necessary.