docs: note api run in same process

docs/guide/api-javascript.md

@@ -30,6 +30,10 @@ const { createServer } = require('vite')
 })()
 ```
 
+::: tip NOTE
+When using `createServer` and `build` in the same Node.js process, both functions rely on `process.env.`<wbr>`NODE_ENV` to work properly, which also depends on the `mode` config option. To prevent conflicting behavior, set `process.env.`<wbr>`NODE_ENV` or the `mode` of the two APIs to `development`. Otherwise, you can spawn a child process to run the APIs separately.
+:::
+
 ## `InlineConfig`
 
 The `InlineConfig` interface extends `UserConfig` with additional properties:

docs/guide/ssr.md

@@ -169,7 +169,7 @@ Our scripts in `package.json` will look like this:
 
 Note the `--ssr` flag which indicates this is an SSR build. It should also specify the SSR entry.
 
-Then, in `server.js` we need to add some production specific logic by checking `process.env.NODE_ENV`:
+Then, in `server.js` we need to add some production specific logic by checking `process.env.`<wbr>`NODE_ENV`:
 
 - Instead of reading the root `index.html`, use the `dist/client/index.html` as the template instead, since it contains the correct asset links to the client build.