Fixed incorrect typing of custom event in standard DOM. (#60)

Author: ota-meshi

src/context/script-let.ts

@@ -805,6 +805,10 @@ function removeReference(reference: Reference, baseScope: Scope) {
 
 /** Remove scope */
 function removeScope(scopeManager: ScopeManager, scope: Scope) {
+    for (const childScope of scope.childScopes) {
+        removeScope(scopeManager, childScope)
+    }
+
     while (scope.references[0]) {
         removeReference(scope.references[0], scope)
     }

src/parser/converts/attr.ts

@@ -250,7 +250,7 @@ function convertEventHandlerDirective(
             ctx,
             isCustomEvent
                 ? "(e:CustomEvent<any>)=>void"
-                : `(e:HTMLElementEventMap['${node.name}'])=>void`,
+                : `(e:'${node.name}' extends keyof HTMLElementEventMap?HTMLElementEventMap['${node.name}']:CustomEvent<any>)=>void`,
         ),
     )
     return directive