Minor tweak

rules/expiring-todo-comments.js

@@ -284,16 +284,13 @@ const create = context => {
 	// This is highly dependable on ESLint's `no-warning-comments` implementation.
 	// What we do is patch the parts we know the rule will use, `getAllComments`.
 	// Since we have priority, we leave only the comments that we didn't use.
-	const fakeSourceCode = {
-		...sourceCode,
-		getAllComments: () => options.allowWarningComments ? [] : unusedComments,
-	};
 	const fakeContext = {
 		...context,
-		sourceCode: fakeSourceCode,
-		getSourceCode() {
-			return fakeSourceCode;
+		sourceCode: {
+			...sourceCode,
+			getAllComments: () => options.allowWarningComments ? [] : unusedComments,
 		},
+		getSourceCode: () => fakeContext.sourceCode,
 	};
 	const rules = baseRule.create(fakeContext);