Merging from dart3a

.github/dependabot.yml

@@ -0,0 +1,15 @@
+# Dependabot configuration file.
+# See https://docs.github.com/en/code-security/dependabot/dependabot-version-updates
+version: 2
+
+enable-beta-ecosystems: true
+updates:
+  - package-ecosystem: "pub"
+    directory: "."
+    schedule:
+      interval: "monthly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/run_ci.yml

@@ -24,4 +24,4 @@ jobs:
           sdk: ${{ matrix.dart }}
       - run: dart --version
       - run: dart pub get
-      - run: dart run tool/run_ci.dart
+      - run: dart run tool/run_ci.dart

analysis_options.yaml

@@ -1,2 +1,2 @@
 # tekartik analysis_options extension to pedantic
-include: package:tekartik_common_utils/pedantic/analysis_options.strong_mode.yaml
+include: package:tekartik_lints/strict.yaml

dart_test.yaml

@@ -0,0 +1,3 @@
+platforms:
+  - vm
+  - chrome

example/component-handler/list_sample.dart

@@ -52,6 +52,6 @@ Future main() async {
   jsComponentHandler.upgradeDom();
 
   createList();
-  await Future.delayed(const Duration(milliseconds: 100));
+  await Future<void>.delayed(const Duration(milliseconds: 100));
   createList();
 }

lib/mdl_js.dart

@@ -45,7 +45,7 @@ class ComponentHandler {
     */
     upgradeElement(element);
     if (!mdl.isComponentUpgraded(element)) {
-      throw 'element not upgrade $element ${Map.from(element.attributes)}';
+      throw 'element not upgrade $element ${Map<String, String>.from(element.attributes)}';
     }
     //return completer.future;
     return Future.value();

pubspec.yaml

@@ -5,27 +5,23 @@ description: Material design lite base resources and wrappers
 homepage: https://github.com/tekartik/mdl_js.dart
 publish_to: none
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=3.0.0 <4.0.0'
 dependencies:
   js: any
   tekartik_browser_utils:
     git:
       url: https://github.com/tekartik/browser_utils.dart
-      ref: dart2_3
+      ref: dart3a
     version: '>=0.6.8+1'
-  chrome_travis:
+  pub_semver:
+  tekartik_common_utils:
     git:
-      url: https://github.com/tekartik/chrome_travis.dart
-      ref: dart2_3
-  pub_semver: 
+      url: https://github.com/tekartik/common_utils.dart
+      ref: dart3a
 dev_dependencies:
   test: any
   dev_test: any
   build_runner: '>=0.9.0'
   build_test: '>=0.10.2'
   build_web_compilers: '>=0.4.0'
   process_run: '>=0.10.1'
-  tekartik_common_utils:
-    git:
-      url: https://github.com/tekartik/common_utils.dart
-      ref: dart2_3