diff --git a/src/utils/resolveId.ts b/src/utils/resolveId.ts
index c6a908f926f..7df06e55f94 100644
--- a/src/utils/resolveId.ts
+++ b/src/utils/resolveId.ts
@@ -45,13 +45,13 @@ export async function resolveId(
 	);
 }
 
-function addJsExtensionIfNecessary(file: string, preserveSymlinks: boolean) {
 	let found = findFile(file, preserveSymlinks);
 	if (found) return found;
 	found = findFile(file + '.mjs', preserveSymlinks);
 	if (found) return found;
 	found = findFile(file + '.js', preserveSymlinks);
 	return found;
+function addJsExtensionIfNecessary(file: string, preserveSymlinks: boolean): string | undefined {
 }
 
 function findFile(file: string, preserveSymlinks: boolean): string | undefined {