From da45e781cf48eec8e6a09979140484e021bea7f3 Mon Sep 17 00:00:00 2001
From: Guillaume <gui.lebas@gmail.com>
Date: Tue, 26 Jan 2021 18:16:06 +0100
Subject: [PATCH 1/2] test(hmr) expect old link not removed twice

---
 test/HMR.test.js | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/test/HMR.test.js b/test/HMR.test.js
index 6a2f0067..e049ae13 100644
--- a/test/HMR.test.js
+++ b/test/HMR.test.js
@@ -306,4 +306,31 @@ describe('HMR', () => {
       done();
     }, 100);
   });
+
+  it('should not remove old link when new link is loaded twice', (done) => {
+
+    const link = document.createElement('link');
+
+    link.innerHTML = '<link rel="preload stylesheet" href="./dist/main.css" />';
+    document.head.appendChild(link);
+    document.head.removeChild = jest.fn();
+
+    const update = hotModuleReplacement('./dist/main.css', {});
+
+    update();
+
+    setTimeout(() => {
+
+      const links = Array.prototype.slice.call(
+        document.querySelectorAll('link')
+      );
+
+      links[1].dispatchEvent(getLoadEvent());
+      links[1].dispatchEvent(getLoadEvent());
+
+      expect(document.head.removeChild).toHaveBeenCalledTimes(1);
+
+      done();
+    }, 100);
+  });
 });

From cceeafd7fe28eb25e2643de0b861fba775357eda Mon Sep 17 00:00:00 2001
From: Guillaume <gui.lebas@gmail.com>
Date: Tue, 26 Jan 2021 18:17:40 +0100
Subject: [PATCH 2/2] fix(hmr) Prevent error from removing preloaded stylesheet
 link twice (#682)

---
 src/hmr/hotModuleReplacement.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/hmr/hotModuleReplacement.js b/src/hmr/hotModuleReplacement.js
index c5b1bbfd..dee34937 100644
--- a/src/hmr/hotModuleReplacement.js
+++ b/src/hmr/hotModuleReplacement.js
@@ -108,6 +108,7 @@ function updateCss(el, url) {
   newEl.isLoaded = false;
 
   newEl.addEventListener('load', () => {
+    if (newEl.isLoaded) return;
     newEl.isLoaded = true;
     el.parentNode.removeChild(el);
   });