Add stubs for user methods too

jael_web/example/stateful.g.dart

@@ -8,6 +8,7 @@ part of 'stateful.dart';
 
 abstract class _StatefulAppJaelTemplate implements Component<_AppState> {
   Timer get _timer;
+  void beforeDestroy();
   @override
   DomNode render() {
     return h('div', {}, [text('Tick count: '), text(state.ticks.toString())]);

jael_web/lib/src/builder/builder.dart

@@ -1,5 +1,4 @@
 import 'dart:async';
-
 import 'package:analyzer/dart/element/element.dart';
 import 'package:build/build.dart';
 import 'package:code_builder/code_builder.dart';
@@ -75,6 +74,21 @@ class JaelComponentGenerator extends GeneratorForAnnotation<Jael> {
           }));
         }
 
+        // ... And methods too.
+        for (var method in element.methods) {
+          b.methods.add(Method((b) {
+            b
+              ..name = method.name
+              ..returns = convertTypeReference(method.returnType)
+              ..requiredParameters.addAll(method.parameters
+                  .where(isRequiredParameter)
+                  .map(convertParameter))
+              ..optionalParameters.addAll(method.parameters
+                  .where(isOptionalParameter)
+                  .map(convertParameter));
+          }));
+        }
+
         // Add a render() stub
         b.methods.add(Method((b) {
           b

jael_web/lib/src/builder/util.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 
+import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:build/build.dart';
 import 'package:code_builder/code_builder.dart';
@@ -18,6 +19,25 @@ TypeReference convertTypeReference(DartType t) {
   });
 }
 
+bool isRequiredParameter(ParameterElement e) {
+  return e.isNotOptional;
+}
+
+bool isOptionalParameter(ParameterElement e) {
+  return e.isOptional;
+}
+
+Parameter convertParameter(ParameterElement e) {
+  return Parameter((b) {
+    b
+      ..name = e.name
+      ..type = convertTypeReference(e.type)
+      ..named = e.isNamed
+      ..defaultTo =
+          e.defaultValueCode == null ? null : Code(e.defaultValueCode);
+  });
+}
+
 UnsupportedError _unsupported() =>
     UnsupportedError('Not support in R/O build file system.');
 
@@ -183,8 +203,8 @@ class BuildSystemFile extends File {
       throw _unsupported();
 
   @override
-  Directory get parent =>
+  Directory get parent => BuildSystemDirectory(
-      BuildSystemDirectory(fileSystem, reader, package, fileSystem.path.dirname(path));
+      fileSystem, reader, package, fileSystem.path.dirname(path));
 
   @override
   Future<List<int>> readAsBytes() {