From 434b9595c00a2a1e5559327538b70dd8b4b7f21e Mon Sep 17 00:00:00 2001
From: Steve Repsher <steverep@users.noreply.github.com>
Date: Mon, 16 Oct 2023 06:42:46 -0400
Subject: [PATCH] Remove SystemJS loader from Webpack builds (#18249)

---
 build-scripts/gulp/gather-static.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build-scripts/gulp/gather-static.js b/build-scripts/gulp/gather-static.js
index a71c1e3f32..29d91d314b 100644
--- a/build-scripts/gulp/gather-static.js
+++ b/build-scripts/gulp/gather-static.js
@@ -4,6 +4,7 @@ import fs from "fs-extra";
 import gulp from "gulp";
 import path from "path";
 import paths from "../paths.cjs";
+import env from "../env.cjs";
 
 const npmPath = (...parts) =>
   path.resolve(paths.polymer_dir, "node_modules", ...parts);
@@ -62,6 +63,9 @@ function copyPolyfills(staticDir) {
 }
 
 function copyLoaderJS(staticDir) {
+  if (!env.useRollup()) {
+    return;
+  }
   const staticPath = genStaticPath(staticDir);
   copyFileDir(npmPath("systemjs/dist/s.min.js"), staticPath("js"));
   copyFileDir(npmPath("systemjs/dist/s.min.js.map"), staticPath("js"));