Expose WebAssembly.Instance (#3296)

Author: daxpedda

crates/cli-support/src/intrinsic.rs

@@ -243,6 +243,9 @@ intrinsics! {
         #[symbol = "__wbindgen_memory"]
         #[signature = fn() -> Externref]
         Memory,
+        #[symbol = "__wbindgen_exports"]
+        #[signature = fn() -> Externref]
+        Exports,
         #[symbol = "__wbindgen_module"]
         #[signature = fn() -> Externref]
         Module,

crates/cli-support/src/js/mod.rs

@@ -3535,6 +3535,11 @@ impl<'a> Context<'a> {
                 format!("__wbg_init.__wbindgen_wasm_module")
             }
 
+            Intrinsic::Exports => {
+                assert_eq!(args.len(), 0);
+                "wasm".to_string()
+            }
+
             Intrinsic::Memory => {
                 assert_eq!(args.len(), 0);
                 let mut memories = self.module.memories.iter();

src/lib.rs

@@ -1082,6 +1082,7 @@ externs! {
 
         fn __wbindgen_not(idx: u32) -> u32;
 
+        fn __wbindgen_exports() -> u32;
         fn __wbindgen_memory() -> u32;
         fn __wbindgen_module() -> u32;
         fn __wbindgen_function_table() -> u32;
@@ -1358,6 +1359,11 @@ pub fn module() -> JsValue {
     unsafe { JsValue::_new(__wbindgen_module()) }
 }
 
+/// Returns a handle to this wasm instance's `WebAssembly.Instance.prototype.exports`
+pub fn exports() -> JsValue {
+    unsafe { JsValue::_new(__wbindgen_exports()) }
+}
+
 /// Returns a handle to this wasm instance's `WebAssembly.Memory`
 pub fn memory() -> JsValue {
     unsafe { JsValue::_new(__wbindgen_memory()) }