When multiple i18n are configured, the plug-in will report an error when using the Link tag.

[CodFrm]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

Using the Link tag in the plug-in will report the following error:

Error: Unable to build website for locale zh-CN.
    at tryToBuildLocale (/Users/codfrm/Code/my-website/node_modules/@docusaurus/core/lib/commands/build.js:55:19)
    at async mapAsyncSequential (/Users/codfrm/Code/my-website/node_modules/@docusaurus/utils/lib/jsUtils.js:44:24)
    at async Command.build (/Users/codfrm/Code/my-website/node_modules/@docusaurus/core/lib/commands/build.js:82:21) {
  [cause]: Error: Docusaurus found broken links!
  
  Please check the pages of your site in the list below, and make sure you don't reference any path that does not exist.
  Note: it's possible to ignore broken links with the 'onBrokenLinks' Docusaurus configuration, and let the build pass.
  
  Exhaustive list of all broken links found:
  - Broken link on source page path = /test:
     -> linking to /zh-CN/test/2
  - Broken link on source page path = /test/2:
     -> linking to /zh-CN/test/2
  
      at throwError (/Users/codfrm/Code/my-website/node_modules/@docusaurus/logger/lib/index.js:79:11)
      at reportBrokenLinks (/Users/codfrm/Code/my-website/node_modules/@docusaurus/core/lib/server/brokenLinks.js:242:47)
      at handleBrokenLinks (/Users/codfrm/Code/my-website/node_modules/@docusaurus/core/lib/server/brokenLinks.js:274:5)
      at buildLocale (/Users/codfrm/Code/my-website/node_modules/@docusaurus/core/lib/commands/build.js:192:47)
      at async tryToBuildLocale (/Users/codfrm/Code/my-website/node_modules/@docusaurus/core/lib/commands/build.js:46:20)
      at async mapAsyncSequential (/Users/codfrm/Code/my-website/node_modules/@docusaurus/utils/lib/jsUtils.js:44:24)
      at async Command.build (/Users/codfrm/Code/my-website/node_modules/@docusaurus/core/lib/commands/build.js:82:21)
}

[INFO] Docusaurus version: 3.1.1
Node version: v20.11.1

Reproducible demo

No response

Steps to reproduce

Below is a reproducible sample：

test.zip

Expected behavior

No error is reported and the alternate in build/zh-CN/test/index.html is generated correctly.

Actual behavior

An error is reported and the alternate in build/zh-CN/test/index.html generates multiple slashes

    <link
      data-rh="true"
      rel="alternate"
      href="https://your-docusaurus-site.example.com/zh-CN//test"
      hreflang="zh-CN"
    />

Your environment

• Public source code:
• Public site URL:
• Docusaurus version used: 3.1.1
• Environment name and version (e.g. Chrome 89, Node.js 16.4): Edge 122.0.2365.80,Nodejs v20.11.1
• Operating system and version (e.g. Ubuntu 20.04.2 LTS): MacOS 14.0 (23A344)

Self-service

• I'd be willing to fix this bug myself.

[slorber]

The reported errors are correct, and you can see the problem if you run your site with yarn start --locale zh-CN

This is because the localized variant of your site is using baseUrl: '/zh-CN/' automatically.

Currently, it is the responsibility of plugin authors to add the site baseUrl to the route config. If you do this, it will work:

    async contentLoaded({ content, actions }): Promise<void> {
      const { addRoute } = actions;
      addRoute({
        path: context.baseUrl+"test",
        component: "@theme/Test",
      });

      addRoute({
        path: context.baseUrl+"/test/2",
        component: "@theme/Test",
      });
    },

I'll look into simplifying this later, and try to make your code work, but for now this is the current state of how things work, and changing this behavior would be a breaking change.