Only use wasm_bindgen::__rt in proc-macros

This caused breakage in `js-sys` and `wasm-bindgen-futures` when not enabling the `std` crate feature of `wasm-bindgen` but disabling their own.

Author: daxpedda

CHANGELOG.md

@@ -1,6 +1,15 @@
 # `wasm-bindgen` Change Log
 --------------------------------------------------------------------------------
 
+## Unreleased
+
+### Fixed
+
+* Fixed `js-sys` and `wasm-bindgen-futures` relying on internal paths of `wasm-bindgen` that are not crate feature additive.
+  [#4305](https://github.com/rustwasm/wasm-bindgen/pull/4305)
+
+--------------------------------------------------------------------------------
+
 ## [0.2.96](https://github.com/rustwasm/wasm-bindgen/compare/0.2.95...0.2.96)
 
 Released 2024-11-29

crates/futures/src/queue.rs

@@ -118,11 +118,19 @@ impl Queue {
 
     #[cfg(not(feature = "std"))]
     pub(crate) fn with<R>(f: impl FnOnce(&Self) -> R) -> R {
-        use wasm_bindgen::__rt::LazyCell;
+        use once_cell::unsync::Lazy;
+
+        struct Wrapper<T>(Lazy<T>);
+
+        #[cfg(not(target_feature = "atomics"))]
+        unsafe impl<T> Sync for Wrapper<T> {}
+
+        #[cfg(not(target_feature = "atomics"))]
+        unsafe impl<T> Send for Wrapper<T> {}
 
         #[cfg_attr(target_feature = "atomics", thread_local)]
-        static QUEUE: LazyCell<Queue> = LazyCell::new(Queue::new);
+        static QUEUE: Wrapper<Queue> = Wrapper(Lazy::new(Queue::new));
 
-        f(&QUEUE)
+        f(&QUEUE.0)
     }
 }

crates/js-sys/Cargo.toml

@@ -25,6 +25,7 @@ default = ["std"]
 std = ["wasm-bindgen/std"]
 
 [dependencies]
+once_cell = { version = "1.12", default-features = false }
 wasm-bindgen = { path = "../..", version = "=0.2.96", default-features = false }
 
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]

crates/js-sys/src/lib.rs

@@ -6038,12 +6038,20 @@ pub fn global() -> Object {
     }
     #[cfg(not(feature = "std"))]
     {
-        use wasm_bindgen::__rt::LazyCell;
+        use once_cell::unsync::Lazy;
+
+        struct Wrapper<T>(Lazy<T>);
+
+        #[cfg(not(target_feature = "atomics"))]
+        unsafe impl<T> Sync for Wrapper<T> {}
+
+        #[cfg(not(target_feature = "atomics"))]
+        unsafe impl<T> Send for Wrapper<T> {}
 
         #[cfg_attr(target_feature = "atomics", thread_local)]
-        static GLOBAL: LazyCell<Object> = LazyCell::new(get_global_object);
+        static GLOBAL: Wrapper<Object> = Wrapper(Lazy::new(get_global_object));
 
-        return GLOBAL.clone();
+        return GLOBAL.0.clone();
     }
 
     fn get_global_object() -> Object {

crates/test/Cargo.toml

@@ -11,7 +11,7 @@ version = "0.3.46"
 
 [features]
 default = ["std"]
-std = ["wasm-bindgen/std", "js-sys/std", "wasm-bindgen-futures/std", "once_cell/std", "scoped-tls"]
+std = ["wasm-bindgen/std", "js-sys/std", "wasm-bindgen-futures/std", "scoped-tls"]
 
 [dependencies]
 gg-alloc = { version = "1.0", optional = true }