Split out JSExportCanonicalizeContext

lib/src/js/importer/canonicalize_context.dart

@@ -0,0 +1,21 @@
+// Copyright 2014 Google Inc. Use of this source code is governed by an
+// MIT-style license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+import 'package:js/js.dart';
+
+import '../../importer/canonicalize_context.dart';
+import '../url.dart';
+import '../../util/nullable.dart';
+import '../utils.dart';
+
+@JSExport()
+class JSExportCanonicalizeContext {
+  final CanonicalizeContext _canonicalizeContext;
+
+  bool get fromImport => _canonicalizeContext.fromImport;
+  JSUrl? get containingUrl =>
+      _canonicalizeContext.containingUrl.andThen(dartToJSUrl);
+
+  JSExportCanonicalizeContext(this._canonicalizeContext);
+}

lib/src/js/utils.dart

@@ -11,12 +11,12 @@ import 'package:js/js_util.dart';
 
 import '../importer/canonicalize_context.dart';
 import '../syntax.dart';
-import '../util/nullable.dart';
 import '../utils.dart';
 import '../value.dart';
 import 'array.dart';
 import 'function.dart';
 import 'importer.dart';
+import 'importer/canonicalize_context.dart';
 import 'module.dart';
 import 'reflection.dart';
 import 'url.dart';
@@ -200,22 +200,9 @@ Uri jsToDartUrl(JSUrl url) => Uri.parse(url.toString());
 /// Converts a Dart [Uri] object to a standard JS `URL` object.
 JSUrl dartToJSUrl(Uri url) => JSUrl(url.toString());
 
-/// The use of  `@JSExport()` together with `createDartExport` allow us
-/// to create a JSObject that lazily access containingUrl
-@JSExport()
-class _JSExportCanonicalizeContext {
-  final CanonicalizeContext _canonicalizeContext;
-
-  bool get fromImport => _canonicalizeContext.fromImport;
-  JSUrl? get containingUrl =>
-      _canonicalizeContext.containingUrl.andThen(dartToJSUrl);
-
-  _JSExportCanonicalizeContext(this._canonicalizeContext);
-}
-
 JSCanonicalizeContext dartToJSCanonicalizeContext(
     CanonicalizeContext canonicalizeContext) {
-  return createDartExport(_JSExportCanonicalizeContext(canonicalizeContext))
+  return createDartExport(JSExportCanonicalizeContext(canonicalizeContext))
       as JSCanonicalizeContext;
 }