clarify onMount with async

5 years ago · 83084f9d1c
parent 1644f207b1
commit 83084f9d1c
1 changed files with 2 additions and 0 deletions
--- a/site/content/docs/03-run-time.md
+++ b/site/content/docs/03-run-time.md
@ -50,6 +50,8 @@ If a function is returned from `onMount`, it will be called when the component i
 </script>
 ```

+Note that returning a function is only available for *synchronous* onMount functions. If an async function or promise is passed to `onMount`, the function returned will **not** be called when the component is unmounted.
+
 #### `beforeUpdate`

 ```js