chore(client): expose hot.prune API

docs/guide/api-hmr.md

@@ -29,6 +29,7 @@ interface ViteHotContext {
   ): void
 
   dispose(cb: (data: any) => void): void
+  prune(cb: (data: any) => void): void
   decline(): void
   invalidate(message?: string): void
 
@@ -115,6 +116,18 @@ if (import.meta.hot) {
 }
 ```
 
+## `hot.prune(cb)`
+
+Register a callback that will call when the module is no longer imported on the page. This can be used to clean up side effects like style injections. Vite already does this for `.css` imports.
+
+```js
+if (import.meta.hot) {
+  import.meta.hot.prune((data) => {
+    // cleanup side effect
+  })
+}
+```
+
 ## `hot.data`
 
 The `import.meta.hot.data` object is persisted across different instances of the same updated module. It can be used to pass on information from a previous version of the module to the next one.

packages/vite/src/client/client.ts

@@ -548,8 +548,7 @@ export function createHotContext(ownerPath: string): ViteHotContext {
       disposeMap.set(ownerPath, cb)
     },
 
-    // @ts-expect-error untyped
-    prune(cb: (data: any) => void) {
+    prune(cb) {
       pruneMap.set(ownerPath, cb)
     },
 

packages/vite/types/hot.d.ts

@@ -22,6 +22,7 @@ export interface ViteHotContext {
   ): void
 
   dispose(cb: (data: any) => void): void
+  prune(cb: (data: any) => void): void
   decline(): void
   invalidate(message?: string): void