Address lint issues

Author: spenserblack

packages/jest-config/src/normalize.ts

@@ -770,7 +770,8 @@ export default async function normalize(
       case 'testMatch':
         {
           const option = oldOptions[key];
-          const rawValue = Array.isArray(option) || typeof option === "undefined" ? option : [option];
+          const rawValue =
+            Array.isArray(option) || option == null ? option : [option];
           const replacedRootDirTags = _replaceRootDirTags(
             escapeGlobCharacters(options.rootDir),
             rawValue,