fix: allow .mjs extension for route config file (#13931)

timdorr · web-flow · commit b4e7d2c0b48c · 2025-07-03T15:30:42.000-04:00
diff --git a/.changeset/dirty-dolls-pay.md b/.changeset/dirty-dolls-pay.md
@@ -0,0 +1,5 @@
+---
+"@react-router/dev": patch
+---
+
+Allow `.mts` and `.mjs` extensions for route config file
diff --git a/packages/react-router-dev/config/config.ts b/packages/react-router-dev/config/config.ts
@@ -914,7 +914,7 @@ function omitRoutes(
   };
 }
 
-const entryExts = [".js", ".jsx", ".ts", ".tsx"];
+const entryExts = [".js", ".jsx", ".ts", ".tsx", ".mjs", ".mts"];
 
 function isEntryFile(entryBasename: string, filename: string) {
   return entryExts.some((ext) => filename === `${entryBasename}${ext}`);

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +"@react-router/dev": patch
 +---
++
 +Allow `.mts` and `.mjs` extensions for route config file
Original file line number	Diff line number	Diff line change
`@@ -914,7 +914,7 @@ function omitRoutes(`
`914`	`914`	`};`
`915`	`915`	`}`
`916`	`916`
`917`		`-const entryExts = [".js", ".jsx", ".ts", ".tsx"];`
	`917`	`+const entryExts = [".js", ".jsx", ".ts", ".tsx", ".mjs", ".mts"];`
`918`	`918`
`919`	`919`	`function isEntryFile(entryBasename: string, filename: string) {`
`920`	`920`	return entryExts.some((ext) => filename === `${entryBasename}${ext}`);