diff --git a/scripts/build/esbuild-plugins/umd.mjs b/scripts/build/esbuild-plugins/umd.mjs
index 1d5f00209539..0050ab35416a 100644
--- a/scripts/build/esbuild-plugins/umd.mjs
+++ b/scripts/build/esbuild-plugins/umd.mjs
@@ -118,10 +118,9 @@ export default function esbuildPluginUmd({ name }) {
         fs.writeFileSync(
           outfile,
           intro +
-            text.slice(
-              expectedOutput.start.length,
-              -expectedOutput.end.length
-            ) +
+            text
+              .slice(expectedOutput.start.length, -expectedOutput.end.length)
+              .trimEnd() +
             outro
         );
       });