1 files changed, 59 insertions, 0 deletions
diff --git a/remote/test/puppeteer/packages/puppeteer-core/src/injected/CustomQuerySelector.ts b/remote/test/puppeteer/packages/puppeteer-core/src/injected/CustomQuerySelector.ts
new file mode 100644
index 0000000000..ccd041deea
--- /dev/null
+++ b/remote/test/puppeteer/packages/puppeteer-core/src/injected/CustomQuerySelector.ts
@@ -0,0 +1,59 @@
+/**
+ * @license
+ * Copyright 2023 Google Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type {CustomQueryHandler} from '../common/CustomQueryHandler.js';
+import type {Awaitable, AwaitableIterable} from '../common/types.js';
+
+export interface CustomQuerySelector {
+  querySelector(root: Node, selector: string): Awaitable<Node | null>;
+  querySelectorAll(root: Node, selector: string): AwaitableIterable<Node>;
+}
+
+/**
+ * This class mimics the injected {@link CustomQuerySelectorRegistry}.
+ */
+class CustomQuerySelectorRegistry {
+  #selectors = new Map<string, CustomQuerySelector>();
+
+  register(name: string, handler: CustomQueryHandler): void {
+    if (!handler.queryOne && handler.queryAll) {
+      const querySelectorAll = handler.queryAll;
+      handler.queryOne = (node, selector) => {
+        for (const result of querySelectorAll(node, selector)) {
+          return result;
+        }
+        return null;
+      };
+    } else if (handler.queryOne && !handler.queryAll) {
+      const querySelector = handler.queryOne;
+      handler.queryAll = (node, selector) => {
+        const result = querySelector(node, selector);
+        return result ? [result] : [];
+      };
+    } else if (!handler.queryOne || !handler.queryAll) {
+      throw new Error('At least one query method must be defined.');
+    }
+
+    this.#selectors.set(name, {
+      querySelector: handler.queryOne,
+      querySelectorAll: handler.queryAll!,
+    });
+  }
+
+  unregister(name: string): void {
+    this.#selectors.delete(name);
+  }
+
+  get(name: string): CustomQuerySelector | undefined {
+    return this.#selectors.get(name);
+  }
+
+  clear() {
+    this.#selectors.clear();
+  }
+}
+
+export const customQuerySelectors = new CustomQuerySelectorRegistry();