Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/dev_dependency_test.dart

+import 'descriptor.dart' as d;
+import 'test_pub.dart';
+main() {
+  initConfig();
+  integration("includes root package's dev dependencies", () {
+    d.dir('foo', [d.libDir('foo'), d.libPubspec('foo', '0.0.1')]).create();
+    d.dir('bar', [d.libDir('bar'), d.libPubspec('bar', '0.0.1')]).create();
+    d.dir(appPath, [d.pubspec({
+        "name": "myapp",
+        "dev_dependencies": {
+          "foo": {
+            "path": "../foo"
+          },
+          "bar": {
+            "path": "../bar"
+          }
+        }
+      })]).create();
+    pubGet();
+    d.dir(
+        packagesPath,
+        [
+            d.dir("foo", [d.file("foo.dart", 'main() => "foo";')]),
+            d.dir("bar", [d.file("bar.dart", 'main() => "bar";')])]).validate();
+  });
+  integration("includes dev dependency's transitive dependencies", () {
+    d.dir('foo', [d.libDir('foo'), d.libPubspec('foo', '0.0.1', deps: {
+        "bar": {
+          "path": "../bar"
+        }
+      })]).create();
+    d.dir('bar', [d.libDir('bar'), d.libPubspec('bar', '0.0.1')]).create();
+    d.dir(appPath, [d.pubspec({
+        "name": "myapp",
+        "dev_dependencies": {
+          "foo": {
+            "path": "../foo"
+          }
+        }
+      })]).create();
+    pubGet();
+    d.dir(
+        packagesPath,
+        [
+            d.dir("foo", [d.file("foo.dart", 'main() => "foo";')]),
+            d.dir("bar", [d.file("bar.dart", 'main() => "bar";')])]).validate();
+  });
+  integration("ignores transitive dependency's dev dependencies", () {
+    d.dir('foo', [d.libDir('foo'), d.pubspec({
+        "name": "foo",
+        "version": "0.0.1",
+        "dev_dependencies": {
+          "bar": {
+            "path": "../bar"
+          }
+        }
+      })]).create();
+    d.dir('bar', [d.libDir('bar'), d.libPubspec('bar', '0.0.1')]).create();
+    d.dir(appPath, [d.appPubspec({
+        "foo": {
+          "path": "../foo"
+        }
+      })]).create();
+    pubGet();
+    d.dir(
+        packagesPath,
+        [
+            d.dir("foo", [d.file("foo.dart", 'main() => "foo";')]),
+            d.nothing("bar")]).validate();
+  });
+}