1 files changed, 48 insertions, 0 deletions
diff --git a/remote/test/puppeteer/tools/eslint/src/extensions.ts b/remote/test/puppeteer/tools/eslint/src/extensions.ts
new file mode 100644
index 0000000000..89b9279625
--- /dev/null
+++ b/remote/test/puppeteer/tools/eslint/src/extensions.ts
@@ -0,0 +1,48 @@
+/**
+ * @license
+ * Copyright 2023 Google Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import {ESLintUtils} from '@typescript-eslint/utils';
+
+const createRule = ESLintUtils.RuleCreator(name => {
+  return `https://github.com/puppeteer/puppeteer/tree/main/tools/eslint/${name}.js`;
+});
+
+const enforceExtensionRule = createRule<[], 'extensionsRule'>({
+  name: 'extensions',
+  meta: {
+    docs: {
+      description: 'Requires `.js` for imports',
+      requiresTypeChecking: false,
+    },
+    messages: {
+      extensionsRule: 'Add `.js` to import.',
+    },
+    schema: [],
+    fixable: 'code',
+    type: 'problem',
+  },
+  defaultOptions: [],
+  create(context) {
+    return {
+      ImportDeclaration(node): void {
+        const file = node.source.value.split('/').pop();
+
+        if (!node.source.value.startsWith('.') || file?.includes('.')) {
+          return;
+        }
+        context.report({
+          node: node.source,
+          messageId: 'extensionsRule',
+          fix(fixer) {
+            return fixer.replaceText(node.source, `'${node.source.value}.js'`);
+          },
+        });
+      },
+    };
+  },
+});
+
+export = enforceExtensionRule;