Implement shim_is_module

crates/cli-support/src/intrinsic.rs

@@ -269,5 +269,8 @@ intrinsics! {
         #[symbol = "__wbindgen_init_externref_table"]
         #[signature = fn() -> Unit]
         InitExternrefTable,
+        #[symbol = "__wbindgen_shim_is_module"]
+        #[signature = fn() -> Boolean]
+        ShimIsModule,
     }
 }

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

@@ -3539,6 +3539,10 @@ impl<'a> Context<'a> {
                 }
                 base
             }
+
+            Intrinsic::ShimIsModule => {
+                format!("{}", !self.config.mode.no_modules())
+            }
         };
         Ok(expr)
     }

src/lib.rs

@@ -1080,6 +1080,8 @@ externs! {
         fn __wbindgen_memory() -> u32;
         fn __wbindgen_module() -> u32;
         fn __wbindgen_function_table() -> u32;
+
+        fn __wbindgen_shim_is_module() -> u32;
     }
 }
 
@@ -1364,6 +1366,11 @@ pub fn function_table() -> JsValue {
     unsafe { JsValue::_new(__wbindgen_function_table()) }
 }
 
+/// Returns if the generated JS shim is a ES module.
+pub fn shim_is_module() -> bool {
+    (unsafe { __wbindgen_shim_is_module() }) != 0
+}
+
 #[doc(hidden)]
 pub mod __rt {
     use crate::JsValue;