Incompatibility between react-day-picker and date-fns@4.1.0 causing installation failure

[amooonsen]

Description

When attempting to install react-day-picker alongside date-fns@4.1.0, an error is thrown due to a dependency mismatch. The peer dependency required by react-day-picker specifies date-fns versions ^2.28.0 || ^3.0.0, but the project requires date-fns@4.1.0.

This dependency conflict makes it impossible to install react-day-picker without forcing the installation, potentially causing runtime issues.

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To Reproduce

1. Install react-day-picker and date-fns@4.1.0 in a React project:

   npm install react-day-picker@8.10.1 date-fns@4.1.0

2. Use the following code in your project:

   import { DayPicker } from "react-day-picker";
   import "react-day-picker/style.css";
   
   export default function App() {
       return <DayPicker mode="single" />;
   }

3. Observe the error during dependency resolution or runtime.

Alternatively, use the provided CodeSandbox for easier reproduction:
[CodeSandbox link](https://codesandbox.io/p/sandbox/m2j7fr)

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Actual Behavior

The installation fails with the following error:

npm error ERESOLVE unable to resolve dependency tree
npm error Could not resolve dependency:
npm error peer date-fns@"^2.28.0 || ^3.0.0" from react-day-picker@8.10.1

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Expected Behavior

The library should support newer versions of date-fns (e.g., 4.1.0) or provide clear guidance on dependency compatibility.

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Screenshots

N/A

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Additional Information

• React version: 18.2.0
• react-day-picker version: 8.10.1
• date-fns version: 4.1.0
• Node version: 18.x

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Suggested Solutions

1. Update react-day-picker to support date-fns@4.x.
2. Provide alternative recommendations if date-fns@4.x compatibility is not intended.

Let me know if additional details are required!

[gpbl]

Hi @amooonsen! Please upgrade to v9 for date-fns@4 support, or use overrides in your package.json https://docs.npmjs.com/cli/v9/configuring-npm/package-json#overrides (I can't guarantee it works!)