[JS IR] Consider erasing type parameters in return type in js signatures

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsBridgesConstruction.kt

@@ -31,7 +31,7 @@ class JsBridgesConstruction(context: JsIrBackendContext) : BridgesConstruction<J
                 function.valueParameters.map { it.type.eraseGenerics(context.irBuiltIns) },
                 function.returnType.takeIf {
                     it.getJsInlinedClass() != null || it.isUnit()
-                }
+                }?.eraseGenerics(context.irBuiltIns)
             )
         }
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt

@@ -132,7 +132,7 @@ fun jsFunctionSignature(declaration: IrFunction, context: JsIrBackendContext): S
         // Return type is only used in signature for inline class and Unit types because
         // they are binary incompatible with supertypes.
         if (context.inlineClassesUtils.isTypeInlined(it) || it.isUnit()) {
-            nameBuilder.append("_ret$${it.asString()}")
+            nameBuilder.append("_ret$${it.eraseGenerics(context.irBuiltIns).asString()}")
         }
     }