Let's inject a global component as an example to see how to define and use plugins.
In order to get better type hints, you can install @rspress/shared in the project, and then import the RspressPlugin type through import type { RspressPlugin } from '@rspress/shared'.
A plugin is generally a function that receives some plugin params (optional) and returns an object that contains the name of the plugin and other config.
In the above example, we define a plugin named plugin-example, which will define a global environment variable process.env.SLUG during the build phase, and inject a global component Example.tsx in the document.
Register plugins via plugins in rspress.config.ts:
Then the Example component will be injected into the page and we can access the process.env.SLUG variable in the component.