1 files changed, 71 insertions, 0 deletions
diff --git a/remote/test/puppeteer/src/common/TargetManager.ts b/remote/test/puppeteer/src/common/TargetManager.ts
new file mode 100644
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--- /dev/null
+++ b/remote/test/puppeteer/src/common/TargetManager.ts
@@ -0,0 +1,71 @@
+/**
+ * Copyright 2022 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import Protocol from 'devtools-protocol';
+import {CDPSession} from './Connection.js';
+import {EventEmitter} from './EventEmitter.js';
+import {Target} from './Target.js';
+
+/**
+ * @internal
+ */
+export type TargetFactory = (
+  targetInfo: Protocol.Target.TargetInfo,
+  session?: CDPSession
+) => Target;
+
+/**
+ * @internal
+ */
+export type TargetInterceptor = (
+  createdTarget: Target,
+  parentTarget: Target | null
+) => Promise<void>;
+
+/**
+ * TargetManager encapsulates all interactions with CDP targets and is
+ * responsible for coordinating the configuration of targets with the rest of
+ * Puppeteer. Code outside of this class should not subscribe `Target.*` events
+ * and only use the TargetManager events.
+ *
+ * There are two implementations: one for Chrome that uses CDP's auto-attach
+ * mechanism and one for Firefox because Firefox does not support auto-attach.
+ *
+ * @internal
+ */
+export interface TargetManager extends EventEmitter {
+  getAvailableTargets(): Map<string, Target>;
+  initialize(): Promise<void>;
+  dispose(): void;
+  addTargetInterceptor(
+    session: CDPSession,
+    interceptor: TargetInterceptor
+  ): void;
+  removeTargetInterceptor(
+    session: CDPSession,
+    interceptor: TargetInterceptor
+  ): void;
+}
+
+/**
+ * @internal
+ */
+export const enum TargetManagerEmittedEvents {
+  TargetDiscovered = 'targetDiscovered',
+  TargetAvailable = 'targetAvailable',
+  TargetGone = 'targetGone',
+  TargetChanged = 'targetChanged',
+}