diff --git a/lib/find-plugins.js b/lib/find-plugins.js
index 87b61de..baffd7a 100644
--- a/lib/find-plugins.js
+++ b/lib/find-plugins.js
@@ -161,7 +161,7 @@ function filterPath (path, filter) {
   return filter(path)
 }
 
-const typescriptPattern = /\.(ts|mts|cts)$/iu
+const typescriptPattern = /\.(?:ts|mts|cts)$/iu
 function getScriptType (fname, packageType) {
   return {
     language: typescriptPattern.test(fname) ? 'typescript' : 'javascript',
@@ -169,8 +169,8 @@ function getScriptType (fname, packageType) {
   }
 }
 
-const modulePattern = /\.(mjs|mts)$/iu
-const commonjsPattern = /\.(cjs|cts)$/iu
+const modulePattern = /\.(?:mjs|mts)$/iu
+const commonjsPattern = /\.(?:cjs|cts)$/iu
 function determineModuleType (fname, defaultType) {
   if (modulePattern.test(fname)) {
     return 'module'