Web: remove unnecessary usage of once_cell::unsync::Lazy (#3134)

src/platform_impl/web/async.rs

@@ -1,5 +1,4 @@
 use atomic_waker::AtomicWaker;
-use once_cell::unsync::Lazy;
 use std::future;
 use std::marker::PhantomData;
 use std::ops::Deref;
@@ -25,7 +24,7 @@ pub struct MainThreadSafe<const SYNC: bool, T: 'static, E: 'static> {
 
 impl<const SYNC: bool, T, E> MainThreadSafe<SYNC, T, E> {
     thread_local! {
-        static MAIN_THREAD: Lazy<bool> = Lazy::new(|| {
+        static MAIN_THREAD: bool = {
             #[wasm_bindgen]
             extern "C" {
                 #[derive(Clone)]
@@ -37,13 +36,13 @@ impl<const SYNC: bool, T, E> MainThreadSafe<SYNC, T, E> {
 
             let global: Global = js_sys::global().unchecked_into();
             !global.window().is_undefined()
-        });
+        };
     }
 
     #[track_caller]
     fn new(value: T, handler: fn(&RwLock<Option<T>>, E)) -> Option<Self> {
         Self::MAIN_THREAD.with(|safe| {
-            if !*safe.deref() {
+            if !safe {
                 panic!("only callable from inside the `Window`")
             }
         });
@@ -75,7 +74,7 @@ impl<const SYNC: bool, T, E> MainThreadSafe<SYNC, T, E> {
 
     pub fn send(&self, event: E) {
         Self::MAIN_THREAD.with(|is_main_thread| {
-            if *is_main_thread.deref() {
+            if *is_main_thread {
                 (self.handler)(&self.value, event)
             } else {
                 self.sender.send(event).unwrap()
@@ -84,12 +83,12 @@ impl<const SYNC: bool, T, E> MainThreadSafe<SYNC, T, E> {
     }
 
     fn is_main_thread(&self) -> bool {
-        Self::MAIN_THREAD.with(|is_main_thread| *is_main_thread.deref())
+        Self::MAIN_THREAD.with(|is_main_thread| *is_main_thread)
     }
 
     pub fn with<R>(&self, f: impl FnOnce(&T) -> R) -> Option<R> {
         Self::MAIN_THREAD.with(|is_main_thread| {
-            if *is_main_thread.deref() {
+            if *is_main_thread {
                 Some(f(self.value.read().unwrap().as_ref().unwrap()))
             } else {
                 None

src/platform_impl/web/web_sys/fullscreen.rs

@@ -2,7 +2,7 @@ use std::cell::Cell;
 use std::rc::Rc;
 
 use js_sys::Promise;
-use once_cell::unsync::{Lazy, OnceCell};
+use once_cell::unsync::OnceCell;
 use wasm_bindgen::closure::Closure;
 use wasm_bindgen::prelude::wasm_bindgen;
 use wasm_bindgen::{JsCast, JsValue};
@@ -65,7 +65,7 @@ impl FullscreenHandler {
 
         if has_fullscreen_api_support(&self.canvas) {
             thread_local! {
-                static REJECT_HANDLER: Lazy<Closure<dyn FnMut(JsValue)>> = Lazy::new(|| Closure::new(|_| ()));
+                static REJECT_HANDLER: Closure<dyn FnMut(JsValue)> = Closure::new(|_| ());
             }
             REJECT_HANDLER.with(|handler| {
                 let _ = canvas.request_fullscreen().catch(handler);

src/platform_impl/web/web_sys/resize_scaling.rs

@@ -1,5 +1,4 @@
 use js_sys::{Array, Object};
-use once_cell::unsync::Lazy;
 use wasm_bindgen::prelude::{wasm_bindgen, Closure};
 use wasm_bindgen::{JsCast, JsValue};
 use web_sys::{
@@ -292,7 +291,7 @@ impl Drop for ResizeScaleInternal {
 // See <https://bugs.webkit.org/show_bug.cgi?id=219005>.
 pub fn has_device_pixel_support() -> bool {
     thread_local! {
-        static DEVICE_PIXEL_SUPPORT: Lazy<bool> = Lazy::new(|| {
+        static DEVICE_PIXEL_SUPPORT: bool = {
             #[wasm_bindgen]
             extern "C" {
                 type ResizeObserverEntryExt;
@@ -307,8 +306,8 @@ pub fn has_device_pixel_support() -> bool {
                 &JsValue::from_str("devicePixelContentBoxSize"),
             );
             !descriptor.is_undefined()
-        });
+        };
     }
 
-    DEVICE_PIXEL_SUPPORT.with(|support| **support)
+    DEVICE_PIXEL_SUPPORT.with(|support| *support)
 }

src/platform_impl/web/web_sys/schedule.rs

@@ -1,5 +1,5 @@
 use js_sys::{Function, Object, Promise, Reflect};
-use once_cell::unsync::{Lazy, OnceCell};
+use once_cell::unsync::OnceCell;
 use std::time::Duration;
 use wasm_bindgen::closure::Closure;
 use wasm_bindgen::prelude::wasm_bindgen;
@@ -73,7 +73,7 @@ impl Schedule {
         }
 
         thread_local! {
-            static REJECT_HANDLER: Lazy<Closure<dyn FnMut(JsValue)>> = Lazy::new(|| Closure::new(|_| ()));
+            static REJECT_HANDLER: Closure<dyn FnMut(JsValue)> = Closure::new(|_| ());
         }
         REJECT_HANDLER.with(|handler| {
             let _ = scheduler