diff --git a/.travis.yml b/.travis.yml
index 8f4447d..781f46d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,16 +2,13 @@
 
 dart:
   - dev
+  - stable
+
 dart_task:
   - test: --platform vm
   - test: --platform firefox
-
-matrix:
-  include:
-    - dart: dev
-      dart_task: dartfmt
-    - dart: dev
-      dart_task: dartanalyzer
+  - dartfmt
+  - dartanalyzer: --fatal-infos --fatal-warnings .
 
 # Only building master means that we don't run two builds for each pull request.
 branches:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d6e815..b65db46 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 1.0.10
+
+* Use conditional imports to avoid `dart:isolate` imports on the web.
+* Bump minimum SDK to `2.1.0`.
+
 ## 1.0.9
 
 * Identical to `1.0.6` - republishing with a higher version number to get around
@@ -18,7 +23,7 @@
 
 ## 1.0.5
 
-* Use conditional imports to avoid dart:io imports on the web.
+* Use conditional imports to avoid `dart:io` imports on the web.
 
 ## 1.0.4
 
diff --git a/lib/src/async_package_resolver.dart b/lib/src/async_package_resolver.dart
index 06c61e7..ef75081 100644
--- a/lib/src/async_package_resolver.dart
+++ b/lib/src/async_package_resolver.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
-
 import 'package_resolver.dart';
 import 'sync_package_resolver.dart';
 
diff --git a/lib/src/current_isolate_resolver.dart b/lib/src/current_isolate_resolver.dart
index 22d9fbf..1244b5c 100644
--- a/lib/src/current_isolate_resolver.dart
+++ b/lib/src/current_isolate_resolver.dart
@@ -2,7 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
 import 'dart:isolate';
 
 import 'package:path/path.dart' as p;
@@ -14,7 +13,9 @@
 import 'utils.dart';
 
 /// The package resolution strategy used by the current isolate.
-class CurrentIsolateResolver implements PackageResolver {
+PackageResolver currentIsolateResolver() => _CurrentIsolateResolver();
+
+class _CurrentIsolateResolver implements PackageResolver {
   Future<Map<String, Uri>> get packageConfigMap async {
     if (_packageConfigMap != null) return _packageConfigMap;
 
@@ -28,6 +29,7 @@
 
   Future<Uri> get packageConfigUri => Isolate.packageConfig;
 
+  // ignore: deprecated_member_use
   Future<Uri> get packageRoot => Isolate.packageRoot;
 
   Future<SyncPackageResolver> get asSync async {
diff --git a/lib/src/current_isolate_resolver_stub.dart b/lib/src/current_isolate_resolver_stub.dart
new file mode 100644
index 0000000..110701d
--- /dev/null
+++ b/lib/src/current_isolate_resolver_stub.dart
@@ -0,0 +1,8 @@
+// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package_resolver.dart';
+
+PackageResolver currentIsolateResolver() =>
+    throw UnsupportedError('No current isolate support on this platform');
diff --git a/lib/src/package_resolver.dart b/lib/src/package_resolver.dart
index c72fc9d..d53d761 100644
--- a/lib/src/package_resolver.dart
+++ b/lib/src/package_resolver.dart
@@ -2,15 +2,17 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
-
 import 'package:http/http.dart' as http;
 
-import 'current_isolate_resolver.dart';
 import 'package_config_resolver.dart';
 import 'package_root_resolver.dart';
 import 'sync_package_resolver.dart';
 
+// ignore: uri_does_not_exist
+import 'current_isolate_resolver_stub.dart'
+    // ignore: uri_does_not_exist
+    if (dart.library.isolate) 'current_isolate_resolver.dart' as isolate;
+
 /// A class that defines how to resolve `package:` URIs.
 ///
 /// This includes the information necessary to resolve `package:` URIs using
@@ -81,7 +83,7 @@
 
   /// Returns package resolution strategy describing how the current isolate
   /// resolves `package:` URIs.
-  static final PackageResolver current = new CurrentIsolateResolver();
+  static final PackageResolver current = isolate.currentIsolateResolver();
 
   /// Returns a package resolution strategy that is unable to resolve any
   /// `package:` URIs.
diff --git a/lib/src/sync_package_resolver.dart b/lib/src/sync_package_resolver.dart
index daaf46c..5cb4c99 100644
--- a/lib/src/sync_package_resolver.dart
+++ b/lib/src/sync_package_resolver.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
-
 import 'package:http/http.dart' as http;
 
 import 'no_package_resolver.dart';
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index 5e4b411..b588c54 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -2,19 +2,19 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// TODO(nweiz): Avoid importing dart:io directly when cross-platform libraries
-// exist.
-import 'dart:async';
 import 'dart:convert';
-import 'dart:isolate';
 
 import 'package:http/http.dart' as http;
 import 'package:package_config/packages_file.dart' as packages_file;
 
 // ignore: uri_does_not_exist
-import 'utils_stub.dart'
+import 'utils_io_stub.dart'
     // ignore: uri_does_not_exist
-    if (dart.library.io) 'utils_io.dart' as conditional;
+    if (dart.library.io) 'utils_io.dart' as io;
+// ignore: uri_does_not_exist
+import 'utils_isolate_stub.dart'
+    // ignore: uri_does_not_exist
+    if (dart.library.isolate) 'utils_isolate.dart' as isolate;
 
 /// Loads the configuration map from [uri].
 ///
@@ -28,11 +28,11 @@
   if (resolved.scheme == 'http') {
     text = await (client == null ? http.read(resolved) : client.read(resolved));
   } else if (resolved.scheme == 'file') {
-    text = await conditional.readFileAsString(resolved);
+    text = await io.readFileAsString(resolved);
   } else if (resolved.scheme == 'data') {
     text = resolved.data.contentAsString();
   } else if (resolved.scheme == 'package') {
-    return loadConfigMap(await Isolate.resolvePackageUri(uri), client: client);
+    return loadConfigMap(await isolate.resolvePackageUri(uri), client: client);
   } else {
     throw new UnsupportedError(
         'PackageInfo.loadConfig doesn\'t support URI scheme "${uri.scheme}:".');
@@ -83,4 +83,4 @@
 }
 
 String packagePathForRoot(String package, Uri root) =>
-    conditional.packagePathForRoot(package, root);
+    io.packagePathForRoot(package, root);
diff --git a/lib/src/utils_io.dart b/lib/src/utils_io.dart
index 8959f4d..df768e6 100644
--- a/lib/src/utils_io.dart
+++ b/lib/src/utils_io.dart
@@ -2,14 +2,13 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 
-Future<String> readFileAsString(Uri uri) async {
+Future<String> readFileAsString(Uri uri) {
   var path = uri.toFilePath(windows: Platform.isWindows);
-  return await new File(path).readAsString();
+  return new File(path).readAsString();
 }
 
 String packagePathForRoot(String package, Uri root) {
diff --git a/lib/src/utils_io_stub.dart b/lib/src/utils_io_stub.dart
new file mode 100644
index 0000000..7683079
--- /dev/null
+++ b/lib/src/utils_io_stub.dart
@@ -0,0 +1,10 @@
+// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+Future<String> readFileAsString(Uri uri) => throw UnsupportedError(
+    'Reading files is only supported where dart:io is available.');
+
+String packagePathForRoot(String package, Uri root) => throw UnsupportedError(
+    'Computing package paths from a root is only supported where dart:io is '
+    'available.');
diff --git a/lib/src/utils_isolate.dart b/lib/src/utils_isolate.dart
new file mode 100644
index 0000000..a58c4db
--- /dev/null
+++ b/lib/src/utils_isolate.dart
@@ -0,0 +1,8 @@
+// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:isolate';
+
+Future<Uri> resolvePackageUri(Uri packageUri) =>
+    Isolate.resolvePackageUri(packageUri);
diff --git a/lib/src/utils_isolate_stub.dart b/lib/src/utils_isolate_stub.dart
new file mode 100644
index 0000000..4639b97
--- /dev/null
+++ b/lib/src/utils_isolate_stub.dart
@@ -0,0 +1,6 @@
+// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+Future<Uri> resolvePackageUri(Uri packageUri) =>
+    throw UnsupportedError('May not use a package URI');
diff --git a/lib/src/utils_stub.dart b/lib/src/utils_stub.dart
index cefa097..7683079 100644
--- a/lib/src/utils_stub.dart
+++ b/lib/src/utils_stub.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
-
 Future<String> readFileAsString(Uri uri) => throw UnsupportedError(
     'Reading files is only supported where dart:io is available.');
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 5782128..344aac8 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,12 +1,12 @@
 name: package_resolver
-version: 1.0.9
+version: 1.0.10
 
 description: First-class package resolution strategy classes.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/package_resolver
 
 environment:
-  sdk: '>=2.0.0-dev.37.0 <3.0.0'
+  sdk: '>=2.1.0 <3.0.0'
 
 dependencies:
   collection: ^1.9.0
diff --git a/test/current_isolate_info_test.dart b/test/current_isolate_info_test.dart
index 4891bc9..8f87c21 100644
--- a/test/current_isolate_info_test.dart
+++ b/test/current_isolate_info_test.dart
@@ -4,17 +4,15 @@
 
 @TestOn('vm')
 
-import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 
+import 'package:package_resolver/package_resolver.dart';
+import 'package:package_resolver/src/utils.dart';
 import 'package:path/path.dart' as p;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:test/test.dart';
 
-import 'package:package_resolver/package_resolver.dart';
-import 'package:package_resolver/src/utils.dart';
-
 void main() {
   // It's important to test these, because they use PackageConfig.current and
   // they're used to verify the output of the inner isolate's
@@ -224,6 +222,7 @@
   var errorPort = new ReceivePort();
   try {
     var isolate = await Isolate.spawnUri(data.uri, [], receivePort.sendPort,
+        // ignore: deprecated_member_use
         packageRoot: await packageResolver.packageRoot,
         packageConfig: await packageResolver.packageConfigUri,
         paused: true);