ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot

[mayurwcities]

Can you please update your library with latest react and can also modify the documentation. Lot of issues are there

[tevo-nikita-ivashkov]

Hello @mayurwcities.
If you're building a React app, you should be able to import a TicketMap component as shown here
https://github.com/ticketevolution/seatmaps-client/blob/master/examples/basic-react/main.tsx
And render as usual in React 18.

If you're not building a React app and want to use seatmaps as a standalone library - it shouldn't matter much which React version is bundled.

But thanks for noticing, we'll look into upgrading in the future versions.

[mayurwcities]

Hi @tevo-nikita-ivashkov

Thanks for quick response.

I am using next js 15 with app router and using react 19.1.0

The library @ticketevolution/seatmaps-client is not updated so getting the below error

Error: A React Element from an older version of React was rendered. This is not supported. It can happen if:

• Multiple copies of the "react" package is used.
• A library pre-bundled an old copy of "react" or "react/jsx-runtime".
• A compiler tries to "inline" JSX instead of using the runtime.

I tried to downgrade my react version but next js 15.x.x needed react 19.x.x

npm list react

wcities@192 eventseeker % npm list react
eventseeker@0.1.0 /Users/wcities/ReactStudy/eventseeker
├─┬ @ticketevolution/seatmaps-client@3.5.1
│ └── react@19.1.0 deduped
├─┬ next@15.3.3
│ ├── react@19.1.0 deduped
│ └─┬ styled-jsx@5.1.6
│ └── react@19.1.0 deduped
├─┬ react-calendar@6.0.0
│ └── react@19.1.0 deduped
├─┬ react-dom@19.1.0
│ └── react@19.1.0 deduped
├─┬ react-hot-toast@2.5.2
│ └── react@19.1.0 deduped
├─┬ react-icons@5.5.0
│ └── react@19.1.0 deduped
├─┬ react-slick@0.30.3
│ └── react@19.1.0 deduped
├── react@19.1.0
└─┬ zustand@5.0.5
└── react@19.1.0 deduped

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