diff --git a/crates/backend/src/codegen.rs b/crates/backend/src/codegen.rs
index e3788a2c6..b1ac809aa 100644
--- a/crates/backend/src/codegen.rs
+++ b/crates/backend/src/codegen.rs
@@ -578,6 +578,16 @@ impl ToTokens for ast::ImportType {
         let const_name = format!("__wbg_generated_const_{}", rust_name);
         let const_name = Ident::new(&const_name, Span::call_site());
         let instanceof_shim = Ident::new(&self.instanceof_shim, Span::call_site());
+
+        let internal_obj = match self.extends.first() {
+            Some(target) => {
+                quote! { #target }
+            }
+            None => {
+                quote! { wasm_bindgen::JsValue }
+            }
+        };
+
         (quote! {
             #[allow(bad_style)]
             #(#attrs)*
@@ -585,7 +595,7 @@ impl ToTokens for ast::ImportType {
             #[repr(transparent)]
             #[allow(clippy::all)]
             #vis struct #rust_name {
-                obj: wasm_bindgen::JsValue,
+                obj: #internal_obj
             }
 
             #[allow(bad_style)]
@@ -604,6 +614,15 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                impl core::ops::Deref for #rust_name {
+                    type Target = #internal_obj;
+
+                    #[inline]
+                    fn deref(&self) -> &#internal_obj {
+                        &self.obj
+                    }
+                }
+
                 impl IntoWasmAbi for #rust_name {
                     type Abi = <JsValue as IntoWasmAbi>::Abi;
 
@@ -629,7 +648,7 @@ impl ToTokens for ast::ImportType {
                     #[inline]
                     unsafe fn from_abi(js: Self::Abi, extra: &mut Stack) -> Self {
                         #rust_name {
-                            obj: JsValue::from_abi(js, extra),
+                            obj: JsValue::from_abi(js, extra).into(),
                         }
                     }
                 }
@@ -656,7 +675,7 @@ impl ToTokens for ast::ImportType {
                     unsafe fn ref_from_abi(js: Self::Abi, extra: &mut Stack) -> Self::Anchor {
                         let tmp = <JsValue as RefFromWasmAbi>::ref_from_abi(js, extra);
                         core::mem::ManuallyDrop::new(#rust_name {
-                            obj: core::mem::ManuallyDrop::into_inner(tmp),
+                            obj: core::mem::ManuallyDrop::into_inner(tmp).into(),
                         })
                     }
                 }
@@ -665,20 +684,20 @@ impl ToTokens for ast::ImportType {
                 impl From<JsValue> for #rust_name {
                     #[inline]
                     fn from(obj: JsValue) -> #rust_name {
-                        #rust_name { obj }
+                        #rust_name { obj: obj.into() }
                     }
                 }
 
                 impl AsRef<JsValue> for #rust_name {
                     #[inline]
-                    fn as_ref(&self) -> &JsValue { &self.obj }
+                    fn as_ref(&self) -> &JsValue { self.obj.as_ref() }
                 }
 
 
                 impl From<#rust_name> for JsValue {
                     #[inline]
                     fn from(obj: #rust_name) -> JsValue {
-                        obj.obj
+                        obj.obj.into()
                     }
                 }
 
@@ -703,7 +722,7 @@ impl ToTokens for ast::ImportType {
 
                     #[inline]
                     fn unchecked_from_js(val: JsValue) -> Self {
-                        #rust_name { obj: val }
+                        #rust_name { obj: val.into() }
                     }
 
                     #[inline]
@@ -719,22 +738,6 @@ impl ToTokens for ast::ImportType {
         })
         .to_tokens(tokens);
 
-        let deref_target = match self.extends.first() {
-            Some(target) => quote! { #target },
-            None => quote! { JsValue },
-        };
-        (quote! {
-            #[allow(clippy::all)]
-            impl core::ops::Deref for #rust_name {
-                type Target = #deref_target;
-
-                #[inline]
-                fn deref(&self) -> &#deref_target {
-                    self.as_ref()
-                }
-            }
-        })
-        .to_tokens(tokens);
         for superclass in self.extends.iter() {
             (quote! {
                 #[allow(clippy::all)]
diff --git a/crates/js-sys/src/lib.rs b/crates/js-sys/src/lib.rs
index dec028096..d53e9d005 100644
--- a/crates/js-sys/src/lib.rs
+++ b/crates/js-sys/src/lib.rs
@@ -127,7 +127,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Array;
 
     /// Creates a new empty array
@@ -392,7 +392,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type ArrayBuffer;
 
     /// The `ArrayBuffer` object is used to represent a generic,
@@ -467,7 +467,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, PartialEq)]
+    #[derive(Clone, PartialEq, Eq)]
     pub type Boolean;
 
     /// The `Boolean()` constructor creates an object wrapper for a boolean value.
@@ -505,8 +505,6 @@ impl PartialEq<bool> for Boolean {
     }
 }
 
-impl Eq for Boolean {}
-
 impl fmt::Debug for Boolean {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         self.value_of().fmt(f)
@@ -517,7 +515,7 @@ impl fmt::Debug for Boolean {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type DataView;
 
     /// The `DataView` view provides a low-level interface for reading and
@@ -749,7 +747,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Error;
 
     /// The Error constructor creates an error object.
@@ -788,7 +786,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object, extends = Error)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type EvalError;
 
     /// The EvalError object indicates an error regarding the global eval() function. This
@@ -804,7 +802,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Function;
 
     /// The `Function` constructor creates a new `Function` object. Calling the
@@ -900,7 +898,7 @@ impl Function {
     /// `None`.
     pub fn try_from(val: &JsValue) -> Option<&Function> {
         if val.is_function() {
-            Some(unsafe { mem::transmute(val) })
+            Some(val.unchecked_ref())
         } else {
             None
         }
@@ -911,7 +909,7 @@ impl Function {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Generator;
 
     /// The next() method returns an object with two properties done and value.
@@ -939,7 +937,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Map;
 
     /// The clear() method removes all elements from a Map object.
@@ -1165,7 +1163,8 @@ extern "C" {
     /// The result of calling `next()` on a JS iterator.
     ///
     /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols)
-    #[derive(Clone, Debug)]
+    #[wasm_bindgen(extends = Object)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type IteratorNext;
 
     /// Has the value `true` if the iterator is past the end of the iterated
@@ -1187,8 +1186,8 @@ extern "C" {
 // Math
 #[wasm_bindgen]
 extern "C" {
-    #[derive(Clone, Debug)]
     #[wasm_bindgen(extends = Object)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Math;
 
     /// The Math.abs() function returns the absolute value of a number, that is
@@ -1567,7 +1566,7 @@ impl fmt::Debug for Number {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Date;
 
     /// The getDate() method returns the day of the month for the
@@ -2154,13 +2153,22 @@ impl Object {
     /// `None`.
     pub fn try_from(val: &JsValue) -> Option<&Object> {
         if val.is_object() {
-            Some(unsafe { mem::transmute(val) })
+            Some(val.unchecked_ref())
         } else {
             None
         }
     }
 }
 
+impl PartialEq for Object {
+    #[inline]
+    fn eq(&self, other: &Object) -> bool {
+        Object::is(self.as_ref(), other.as_ref())
+    }
+}
+
+impl Eq for Object {}
+
 // Proxy
 #[wasm_bindgen]
 extern "C" {
@@ -2191,7 +2199,7 @@ extern "C" {
     ///
     /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RangeError)
     #[wasm_bindgen(extends = Error, extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type RangeError;
 
     /// The RangeError object indicates an error when a value is not in the set
@@ -2210,7 +2218,7 @@ extern "C" {
     ///
     /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError)
     #[wasm_bindgen(extends = Error, extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type ReferenceError;
 
     /// The ReferenceError object represents an error when a non-existent
@@ -2224,8 +2232,8 @@ extern "C" {
 // Reflect
 #[wasm_bindgen]
 extern "C" {
-    #[derive(Clone, Debug)]
     #[wasm_bindgen(extends = Object)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Reflect;
 
     /// The static `Reflect.apply()` method calls a target function with
@@ -2384,7 +2392,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type RegExp;
 
     /// The exec() method executes a search for a match in a specified
@@ -2561,7 +2569,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type Set;
 
     /// The `add()` method appends a new element with a specified value to the
@@ -2651,7 +2659,7 @@ extern "C" {
     ///
     /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SyntaxError)
     #[wasm_bindgen(extends = Error, extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type SyntaxError;
 
     /// A SyntaxError is thrown when the JavaScript engine encounters tokens or
@@ -2671,7 +2679,7 @@ extern "C" {
     ///
     /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypeError)
     #[wasm_bindgen(extends = Error, extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type TypeError;
 
     /// The TypeError object represents an error when a value is not of the
@@ -2690,7 +2698,7 @@ extern "C" {
     ///
     /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/URIError)
     #[wasm_bindgen(extends = Error, extends = Object, js_name = URIError)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type UriError;
 
     /// The URIError object represents an error when a global URI handling
@@ -2705,7 +2713,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type WeakMap;
 
     /// The [`WeakMap`] object is a collection of key/value pairs in which the
@@ -2749,7 +2757,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(extends = Object)]
-    #[derive(Clone, Debug)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type WeakSet;
 
     /// The `WeakSet` object lets you store weakly held objects in a collection.
@@ -2836,7 +2844,7 @@ pub mod WebAssembly {
         ///
         /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/CompileError)
         #[wasm_bindgen(extends = Error, js_namespace = WebAssembly)]
-        #[derive(Clone, Debug)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub type CompileError;
 
         /// The `WebAssembly.CompileError()` constructor creates a new
@@ -2858,7 +2866,7 @@ pub mod WebAssembly {
         ///
         /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Instance)
         #[wasm_bindgen(extends = Object, js_namespace = WebAssembly)]
-        #[derive(Clone, Debug)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub type Instance;
 
         /// The `WebAssembly.Instance()` constructor function can be called to
@@ -2889,7 +2897,7 @@ pub mod WebAssembly {
         ///
         /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/LinkError)
         #[wasm_bindgen(extends = Error, js_namespace = WebAssembly)]
-        #[derive(Clone, Debug)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub type LinkError;
 
         /// The `WebAssembly.LinkError()` constructor creates a new WebAssembly
@@ -2910,7 +2918,7 @@ pub mod WebAssembly {
         ///
         /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/RuntimeError)
         #[wasm_bindgen(extends = Error, js_namespace = WebAssembly)]
-        #[derive(Clone, Debug)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub type RuntimeError;
 
         /// The `WebAssembly.RuntimeError()` constructor creates a new WebAssembly
@@ -2931,7 +2939,7 @@ pub mod WebAssembly {
         ///
         /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module)
         #[wasm_bindgen(js_namespace = WebAssembly, extends = Object)]
-        #[derive(Clone, Debug)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub type Module;
 
         /// A `WebAssembly.Module` object contains stateless WebAssembly code
@@ -2973,7 +2981,7 @@ pub mod WebAssembly {
         ///
         /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Table)
         #[wasm_bindgen(js_namespace = WebAssembly, extends = Object)]
-        #[derive(Clone, Debug)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub type Table;
 
         /// The `WebAssembly.Table()` constructor creates a new `Table` object
@@ -3019,7 +3027,7 @@ pub mod WebAssembly {
     extern "C" {
         /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Memory)
         #[wasm_bindgen(js_namespace = WebAssembly, extends = Object)]
-        #[derive(Clone, Debug)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub type Memory;
 
         /// The `WebAssembly.Memory()` constructor creates a new `Memory` object
@@ -3060,8 +3068,8 @@ extern "C" {
     /// Notation (JSON)](https://json.org/) and converting values to JSON. It
     /// can't be called or constructed, and aside from its two method
     /// properties, it has no interesting functionality of its own.
-    #[derive(Clone, Debug)]
     #[wasm_bindgen(extends = Object)]
+    #[derive(Clone, Debug, PartialEq, Eq)]
     pub type JSON;
 
     /// The `JSON.parse()` method parses a JSON string, constructing the
@@ -3120,7 +3128,7 @@ extern "C" {
 #[wasm_bindgen]
 extern "C" {
     #[wasm_bindgen(js_name = String, extends = Object)]
-    #[derive(Clone)]
+    #[derive(Clone, PartialEq, Eq)]
     pub type JsString;
 
     /// The length property of a String object indicates the length of a string,
@@ -3580,7 +3588,7 @@ impl JsString {
     /// `None`.
     pub fn try_from(val: &JsValue) -> Option<&JsString> {
         if val.is_string() {
-            Some(unsafe { mem::transmute(val) })
+            Some(val.unchecked_ref())
         } else {
             None
         }
@@ -3644,9 +3652,7 @@ impl<'a> PartialEq<&'a String> for JsString {
 
 impl<'a> From<&'a str> for JsString {
     fn from(s: &'a str) -> Self {
-        JsString {
-            obj: JsValue::from_str(s),
-        }
+        JsString::unchecked_from_js(JsValue::from_str(s))
     }
 }