[interop] Add support for importing and exporting declarations, as well as multi-file output

web_generator/bin/gen_interop_bindings.dart

@@ -61,8 +61,11 @@ $_usage''');
   final inputFile = argResult.rest.first;
   final outputFile = argResult['output'] as String? ??
       p.join(p.current, inputFile.replaceAll('.d.ts', '.dart'));
-  final configFile =
-      argResult['config'] as String? ?? p.join(p.current, 'webgen.yaml');
+  final defaultWebGenConfigPath = p.join(p.current, 'webgen.yaml');
+  final configFile = argResult['config'] as String? ??
+      (File(defaultWebGenConfigPath).existsSync()
+          ? defaultWebGenConfigPath
+          : null);
   final relativeOutputPath =
       p.relative(outputFile, from: bindingsGeneratorPath);
   // Run app with `node`.
@@ -73,7 +76,7 @@ $_usage''');
       '--declaration',
       '--input=${p.relative(inputFile, from: bindingsGeneratorPath)}',
       '--output=$relativeOutputPath',
-      '--config=$configFile'
+      if (configFile case final config?) '--config=$config'
     ],
     workingDirectory: bindingsGeneratorPath,
   );
@@ -100,5 +103,5 @@ final _parser = ArgParser()
   ..addOption('config',
       hide: true,
       abbr: 'c',
-      help: 'The configuration file to use for this tool (NOTE: Unimplemented)')
-  ..addFlag('help', negatable: false);
+      help:
+          'The configuration file to use for this tool (NOTE: Unimplemented)');

web_generator/lib/src/ast/base.dart

@@ -42,7 +42,7 @@ class ASTOptions {
 }
 
 sealed class Node {
-  abstract final String? name;
+  String? get name;
   abstract final ID id;
   String? get dartName;
 
@@ -53,15 +53,23 @@ sealed class Node {
 
 abstract class Declaration extends Node {
   @override
-  abstract final String name;
+  String get name;
+
+  set name(String newValue);
+
+  set dartName(String? newValue);
 
   @override
   Spec emit([covariant DeclarationOptions? options]);
 }
 
 abstract class NamedDeclaration extends Declaration {
-  ReferredType asReferredType([List<Type>? typeArgs]) =>
-      ReferredType(name: name, declaration: this, typeParams: typeArgs ?? []);
+  @override
+  abstract String name;
+
+  ReferredType asReferredType([List<Type>? typeArgs, String? url]) =>
+      ReferredType(
+          name: name, declaration: this, typeParams: typeArgs ?? [], url: url);
 }
 
 abstract interface class ExportableDeclaration extends Declaration {

web_generator/lib/src/ast/declarations.dart

@@ -17,10 +17,10 @@ import 'types.dart';
 sealed class TypeDeclaration extends NamedDeclaration
     implements ExportableDeclaration {
   @override
-  final String name;
+  String name;
 
   @override
-  final String? dartName;
+  String? dartName;
 
   @override
   final bool exported;
@@ -160,17 +160,20 @@ class VariableDeclaration extends FieldDeclaration
 
   @override
   String? get dartName => null;
+
+  @override
+  set dartName(String? newValue) {}
 }
 
 enum VariableModifier { let, $const, $var }
 
 class FunctionDeclaration extends CallableDeclaration
     implements ExportableDeclaration {
   @override
-  final String name;
+  String name;
 
   @override
-  final String? dartName;
+  String? dartName;
 
   @override
   final List<ParameterDeclaration> parameters;
@@ -231,7 +234,7 @@ class FunctionDeclaration extends CallableDeclaration
 class EnumDeclaration extends NamedDeclaration
     implements ExportableDeclaration {
   @override
-  final String name;
+  String name;
 
   @override
   final bool exported;
@@ -325,14 +328,14 @@ class EnumMember {
 class TypeAliasDeclaration extends NamedDeclaration
     implements ExportableDeclaration {
   @override
-  final String name;
+  String name;
 
   final List<GenericType> typeParameters;
 
   final Type type;
 
   @override
-  final String? dartName;
+  String? dartName;
 
   @override
   bool exported;
@@ -433,13 +436,13 @@ class InterfaceDeclaration extends TypeDeclaration {
 class PropertyDeclaration extends FieldDeclaration
     implements MemberDeclaration {
   @override
-  final String name;
+  String name;
 
   @override
   final ID id;
 
   @override
-  final String? dartName;
+  String? dartName;
 
   @override
   late final TypeDeclaration parent;
@@ -682,6 +685,9 @@ class OperatorDeclaration extends CallableDeclaration
   @override
   String get name => kind.expression;
 
+  @override
+  set name(String? name) {}
+
   OperatorKind kind;
 
   @override

web_generator/lib/src/ast/types.dart

@@ -19,18 +19,21 @@ class ReferredType<T extends Declaration> extends Type {
 
   List<Type> typeParams;
 
+  String? url;
+
   ReferredType(
       {required this.name,
       required this.declaration,
-      this.typeParams = const []});
+      this.typeParams = const [],
+      this.url});
 
   @override
   Reference emit([TypeOptions? options]) {
-    // TODO: Support referred types imported from URL
     return TypeReference((t) => t
-      ..symbol = declaration.name
+      ..symbol = declaration.dartName ?? declaration.name
       ..types.addAll(typeParams.map((t) => t.emit(options)))
-      ..isNullable = options?.nullable);
+      ..isNullable = options?.nullable
+      ..url = url);
   }
 }
 

web_generator/lib/src/dart_main.dart

@@ -70,7 +70,10 @@ Future<void> generateJSInteropBindings(Config config) async {
   final jsDeclarations = parseDeclarationFiles(config.input);
 
   // transform declarations
-  final dartDeclarations = transform(jsDeclarations, config: config);
+  final manager =
+      TransformerManager.fromParsedResults(jsDeclarations, config: config);
+
+  final dartDeclarations = manager.transform();
 
   // generate
   final generatedCodeMap = dartDeclarations.generate(config);