docs: add links to environment api (#16392)

docs/guide/api-vite-runtime.md

@@ -1,7 +1,9 @@
 # Vite Runtime API
 
 :::warning Low-level API
-This API was introduced in Vite 5.1 as an experimental feature. It was added to [gather feedback](https://github.com/vitejs/vite/discussions/15774). There will probably be breaking changes to it in Vite 5.2, so make sure to pin the Vite version to `~5.1.0` when using it. This is a low-level API meant for library and framework authors. If your goal is to create an application, make sure to check out the higher-level SSR plugins and tools at [Awesome Vite SSR section](https://github.com/vitejs/awesome-vite#ssr) first.
+This API was introduced in Vite 5.1 as an experimental feature. It was added to [gather feedback](https://github.com/vitejs/vite/discussions/15774). There will likely be breaking changes, so make sure to pin the Vite version to `~5.1.0` when using it. This is a low-level API meant for library and framework authors. If your goal is to create an application, make sure to check out the higher-level SSR plugins and tools at [Awesome Vite SSR section](https://github.com/vitejs/awesome-vite#ssr) first.
+
+Currently, the API is being revised as the [Environment API](https://github.com/vitejs/vite/discussions/16358) which is released at `^6.0.0-alpha.0`.
 :::
 
 The "Vite Runtime" is a tool that allows running any code by processing it with Vite plugins first. It is different from `server.ssrLoadModule` because the runtime implementation is decoupled from the server. This allows library and framework authors to implement their own layer of communication between the server and the runtime.

docs/guide/ssr.md

@@ -8,6 +8,8 @@ The following guide also assumes prior experience working with SSR in your frame
 
 :::warning Low-level API
 This is a low-level API meant for library and framework authors. If your goal is to create an application, make sure to check out the higher-level SSR plugins and tools at [Awesome Vite SSR section](https://github.com/vitejs/awesome-vite#ssr) first. That said, many applications are successfully built directly on top of Vite's native low-level API.
+
+Currently, Vite is working on an improved SSR API with the [Environment API](https://github.com/vitejs/vite/discussions/16358). Check out the link for more details.
 :::
 
 :::tip Help
@@ -138,17 +140,10 @@ app.use('*', async (req, res, next) => {
     //    preambles from @vitejs/plugin-react
     template = await vite.transformIndexHtml(url, template)
 
-    // 3a. Load the server entry. ssrLoadModule automatically transforms
+    // 3. Load the server entry. ssrLoadModule automatically transforms
     //    ESM source code to be usable in Node.js! There is no bundling
     //    required, and provides efficient invalidation similar to HMR.
     const { render } = await vite.ssrLoadModule('/src/entry-server.js')
-    // 3b. Since Vite 5.1, you can use the experimental createViteRuntime API
-    //    instead.
-    //    It fully supports HMR and works in a simillar way to ssrLoadModule
-    //    More advanced use case would be creating a runtime in a separate
-    //    thread or even a different machine using ViteRuntime class
-    const runtime = await vite.createViteRuntime(server)
-    const { render } = await runtime.executeEntrypoint('/src/entry-server.js')
 
     // 4. render the app HTML. This assumes entry-server.js's exported
     //     `render` function calls appropriate framework SSR APIs,
@@ -183,7 +178,7 @@ The `dev` script in `package.json` should also be changed to use the server scri
 To ship an SSR project for production, we need to:
 
 1. Produce a client build as normal;
-2. Produce an SSR build, which can be directly loaded via `import()` so that we don't have to go through Vite's `ssrLoadModule` or `runtime.executeEntrypoint`;
+2. Produce an SSR build, which can be directly loaded via `import()` so that we don't have to go through Vite's `ssrLoadModule`;
 
 Our scripts in `package.json` will look like this:
 
@@ -203,7 +198,7 @@ Then, in `server.js` we need to add some production specific logic by checking `
 
 - Instead of reading the root `index.html`, use the `dist/client/index.html` as the template, since it contains the correct asset links to the client build.
 
-- Instead of `await vite.ssrLoadModule('/src/entry-server.js')` or `await runtime.executeEntrypoint('/src/entry-server.js')`, use `import('./dist/server/entry-server.js')` (this file is the result of the SSR build).
+- Instead of `await vite.ssrLoadModule('/src/entry-server.js')`, use `import('./dist/server/entry-server.js')` (this file is the result of the SSR build).
 
 - Move the creation and all usage of the `vite` dev server behind dev-only conditional branches, then add static file serving middlewares to serve files from `dist/client`.