Remove start_app_as_body.

packages/yew/src/app_handle.rs

@@ -4,7 +4,6 @@
 use std::ops::Deref;
 
 use crate::html::{BaseComponent, NodeRef, Scope, Scoped};
-use gloo_utils::document;
 use std::rc::Rc;
 use web_sys::Element;
 
@@ -34,20 +33,6 @@ where
         app
     }
 
-    /// Alternative to `mount_with_props` which replaces the body element with a component which
-    /// has a body element at the root of the HTML generated by its `view` method. Use this method
-    /// when you need to manipulate the body element. For example, adding/removing app-wide
-    /// CSS classes of the body element.
-    pub(crate) fn mount_as_body_with_props(props: Rc<COMP::Properties>) -> Self {
-        let html_element = document().document_element().unwrap();
-        let body_element = document().body().expect("no body node found");
-        html_element
-            .remove_child(&body_element)
-            .expect("can't remove body child");
-
-        Self::mount_with_props(html_element, props)
-    }
-
     /// Schedule the app for destruction
     pub fn destroy(mut self) {
         self.scope.destroy()

packages/yew/src/lib.rs

@@ -324,19 +324,6 @@ where
     start_app_with_props(COMP::Properties::default())
 }
 
-/// The main entry point of a Yew application.
-/// Alternative to `start_app` which replaces the body element with a component which has a body
-/// element at the root of the HTML generated by its `view` method. Use this method when you
-/// need to manipulate the body element. For example, adding/removing app-wide
-/// CSS classes of the body element.
-pub fn start_app_as_body<COMP>() -> AppHandle<COMP>
-where
-    COMP: BaseComponent,
-    COMP::Properties: Default,
-{
-    start_app_with_props_as_body(COMP::Properties::default())
-}
-
 /// The main entry point of a Yew application. This function does the
 /// same as `start_app_in_element(...)` but allows to start an Yew application with properties.
 pub fn start_app_with_props_in_element<COMP>(
@@ -365,19 +352,6 @@ where
     )
 }
 
-/// The main entry point of a Yew application.
-/// Alternative to `start_app_with_props` which replaces the body element with a component which has a body
-/// element at the root of the HTML generated by its `view` method. Use this method when you
-/// need to manipulate the body element. For example, adding/removing app-wide
-/// CSS classes of the body element.
-pub fn start_app_with_props_as_body<COMP>(props: COMP::Properties) -> AppHandle<COMP>
-where
-    COMP: BaseComponent,
-{
-    set_default_panic_hook();
-    AppHandle::<COMP>::mount_as_body_with_props(Rc::new(props))
-}
-
 /// The Yew Prelude
 ///
 /// The purpose of this module is to alleviate imports of many common types:

website/docs/migration-guides/yew/from-0_19_0-to-0_20_0.mdx

@@ -0,0 +1,8 @@
+---
+title: "From 0.19.0 to 0.20.0"
+---
+
+## `_as_body` variant of `start_app` is removed
+
+This method of controlling body has caused issues in event registration and
+SSR hydration. They have been removed. Read more in the [github issue](https://github.com/yewstack/yew/pull/2346).