Follow-ups to #5271. (#5273)

Author: iclanton

common/changes/@rushstack/eslint-plugin/bump-versions-follow-up_2025-07-08-01-08.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "comment": "",
+      "type": "none",
+      "packageName": "@rushstack/eslint-plugin"
+    }
+  ],
+  "packageName": "@rushstack/eslint-plugin",
+  "email": "[email protected]"
+}

eslint/eslint-plugin/src/no-untyped-underscore.ts

@@ -26,7 +26,8 @@ const noUntypedUnderscoreRule: TSESLint.RuleModule<MessageIds, Options> = {
     } as TSESLint.RuleMetaDataDocs
   },
   create: (context: TSESLint.RuleContext<MessageIds, Options>) => {
-    const parserServices: Partial<ParserServices> | undefined = context.sourceCode.parserServices;
+    const parserServices: Partial<ParserServices> | undefined =
+      context.sourceCode?.parserServices ?? context.parserServices;
     if (!parserServices || !parserServices.program || !parserServices.esTreeNodeToTSNodeMap) {
       throw new Error(
         'This rule requires your ESLint configuration to define the "parserOptions.project"' +