URL Function Undefined

Describe the bug

When using the docusaurus-openapi-docs plugin, the global URL constructor is undefined. This breaks code that depends on URL, such as the Microsoft Authentication Library for React (msal-react) loginPopup in my application.

Observations:

• When disabling the docusaurus-openapi-docs plugin, URL is properly defined.
• This issue occurs when customizing the ApiItem component in the plugin's theme.

Expected behavior

The global URL constructor should be defined and accessible in the same way as in a default Docusaurus environment.

Current behavior

• URL is undefined inside the customized ApiItem component from the docusaurus-openapi-docs plugin. It is probably same for other components.
• URL is defined correctly when using the standard DocItemLayout from @docusaurus/theme-classic.

Possible solution

The URL constructor may be overwritten or removed by some internal logic in the plugin.

Steps to reproduce

1. Copy the ApiItem folder from docusaurus-theme-openapi-docs/src/theme into yoursrc/theme folder.
2. Inside src/theme/ApiItem/Layout.js, add:

console.log("URL:", URL);

4. Run the project.
5. Observe that URL is undefined.

Compare without the plugin

1. Uninstall the docusaurus-openapi-docs plugin.
2. Copy the DocItem folder from @docusaurus/theme-classic/lib/theme/DocItem/Layout into src/theme.
3. Add the same console log inside the component.
4. Observe that URL is now correctly defined.

Console Output (with docusaurus-openapi-docs enabled):

URL: undefined

Console Output (with docusaurus-openapi-docs disabled):

URL: ƒ URL() { [native code] }

Context

This issue breaks Microsoft Authentication Library for React (msal-react) loginPopup method, which internally depends on URL. The issue blocks the authentication flow in my application.

Your Environment

• Version used: docusaurus-openapi-docs (latest version at the time of writing)
• Docusaurus version: 3.7.0
• Environment name and version: Chrome Version 134.0.6998.119 (Official Build) (arm64), Node.js v22.14.0
• Operating System and version: macOS Sequoia 15.0.1

Start with the copied src/theme/ApiItem/Layout.js and reproduce the console.log("URL:", URL) result with the docusaurus-openapi-docs plugin enabled. Compare it with the copied DocItem layout from @docusaurus/theme-classic and trace where the global URL differs. Done means URL is defined in the customized ApiItem component and the reported msal-react loginPopup flow is no longer blocked.