added util method for webdev to compute package config path and pass it to the load strategy

Author: jyameo

dwds/CHANGELOG.md

@@ -1,6 +1,8 @@
+## 24.3.5-wip
+- Allow clients to specify the `packageConfigPath` in `LoadStrategy` class and associated providers.
+
 ## 24.3.4
 
-- Allow clients to specify the `packageConfigPath` in `LoadStrategy` class and associated providers.
 - Added support for some debugging APIs with the DDC library bundle format. - [#2566](https://github.com/dart-lang/webdev/issues/2566), [#2573](https://github.com/dart-lang/webdev/issues/2573)
 - Added support for hot reload using the DDC library bundle format.
 

dwds/lib/src/version.dart

@@ -1,6 +1,6 @@
 name: dwds
 # Every time this changes you need to run `dart run build_runner build`.
-version: 24.3.4
+version: 24.3.5-wip
 description: >-
   A service that proxies between the Chrome debug protocol and the Dart VM
   service protocol.

dwds/pubspec.yaml

@@ -82,3 +82,26 @@ Future<void> _removeDeleted(String from, String to) async {
     }
   }
 }
+
+/// Returns the absolute file path of the `package_config.json` file in the `.dart_tool`
+/// directory, searching recursively from the current directory hierarchy.
+/// If `_packageConfigPath` is already set, it returns the cached value immediately.
+String? findPackageConfigFilePath() {
+  var candidateDir = Directory(p.current).absolute;
+  while (true) {
+    final candidatePackageConfigFile =
+        File(p.join(candidateDir.path, '.dart_tool', 'package_config.json'));
+
+    if (candidatePackageConfigFile.existsSync()) {
+      return candidatePackageConfigFile.path;
+    }
+
+    final parentDir = candidateDir.parent;
+    if (parentDir.path == candidateDir.path) {
+      // We've reached the root directory
+      return null;
+    }
+
+    candidateDir = parentDir;
+  }
+}

webdev/lib/src/serve/utils.dart

@@ -21,6 +21,7 @@ import '../command/configuration.dart';
 import '../util.dart';
 import 'chrome.dart';
 import 'handlers/favicon_handler.dart';
+import 'utils.dart' show findPackageConfigFilePath;
 
 Logger _logger = Logger('WebDevServer');
 
@@ -141,6 +142,7 @@ class WebDevServer {
         options.configuration.reload,
         assetReader,
         buildSettings,
+        packageConfigPath: findPackageConfigFilePath(),
       ).strategy;
 
       if (options.configuration.enableExpressionEvaluation) {