vitepress-plugin-crosslinks

A VitePress plugin that resolves cross-project documentation links at build time.

Write :project-name:/some/path as a link href in markdown and the plugin replaces it with the absolute URL for that project — no manual URL management across docs.

Installation

npm install vitepress-plugin-crosslinks

Usage

Basic setup

// .vitepress/config.ts
import { defineConfig } from 'vitepress';
import { crosslinksConfig } from 'vitepress-plugin-crosslinks';

export default defineConfig({
  markdown: {
    config: crosslinksConfig({
      projects: {
        'my-docs': 'https://my-docs.example.com',
        'api-ref': 'https://api.example.com',
      },
    }),
  },
});

Link syntax

In any markdown file, use :project-name:/path as the link href:

[Getting started](:my-docs:/guide/getting-started)
[REST endpoints](:api-ref:/rest/users)
![Logo](:my-docs:/images/logo.png)

At build time these become:

[Getting started](https://my-docs.example.com/guide/getting-started)
[REST endpoints](https://api.example.com/rest/users)
![Logo](https://my-docs.example.com/images/logo.png)

Environment variables

Base URLs can be provided or overridden via environment variables. This allows switching between local and production URLs without touching the config file.

The format is:

CROSSLINKS_BASE_<SUFFIX>=<base-url>

The project name is the suffix lowercased:

| Env var | Project name | | ------------------------------ | ------------ | | CROSSLINKS_BASE_MYDOCS | mydocs | | CROSSLINKS_BASE_MY_DOCS | my_docs | | CROSSLINKS_BASE_API_REF | api_ref |

Environment variables override the explicit projects config, so you can provide fallback URLs in the config and override them per-environment:

// .vitepress/config.ts
crosslinksConfig({
  projects: {
    'my_docs': 'http://localhost:3001',  // dev default
    'api_ref': 'http://localhost:3002',  // dev default
  },
})

# .env.production
CROSSLINKS_BASE_MY_DOCS=https://my-docs.example.com
CROSSLINKS_BASE_API_REF=https://api.example.com

Projects discovered from env vars that are not listed in projects config are also resolved automatically.

Custom prefix

crosslinksConfig({
  envPrefix: 'DOCS_URL_',  // looks for DOCS_URL_* instead of CROSSLINKS_BASE_*
  projects: { /* ... */ },
})

API

crosslinksConfig(config?)

Returns a (md: MarkdownIt) => void function suitable for VitePress markdown.config.

import { crosslinksConfig } from 'vitepress-plugin-crosslinks';

resolveProjects(config)

Resolves the merged project map from explicit config and environment variables. Useful if you need the resolved map for other purposes.

import { resolveProjects } from 'vitepress-plugin-crosslinks';
const projects = resolveProjects({ projects: { docs: 'https://example.com' } });

crosslinksMarkdownPlugin(md, projects)

The raw markdown-it plugin. Use this if you need to compose with other markdown-it plugins manually.

import { crosslinksMarkdownPlugin, resolveProjects } from 'vitepress-plugin-crosslinks';

md.use(crosslinksMarkdownPlugin, resolveProjects(config));

License

MIT