From 4be4622f8f76b63ec8af4bc9075ced7abfe75886 Mon Sep 17 00:00:00 2001
From: Sebastian Silbermann <silbermann.sebastian@gmail.com>
Date: Thu, 28 Nov 2019 16:28:41 +0100
Subject: [PATCH] fix: Illegal constructor

---
 test/utils/initMatchers.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/test/utils/initMatchers.js b/test/utils/initMatchers.js
index b83d55411732f9..6490c97250d6f1 100644
--- a/test/utils/initMatchers.js
+++ b/test/utils/initMatchers.js
@@ -104,7 +104,12 @@ chai.use((chaiAPI, utils) => {
      * @returns {CSSStyleDeclaration}
      */
     function pretendVisibleGetComputedStyle(element) {
-      const declaration = new CSSStyleDeclaration();
+      // `CSSStyleDeclaration` is not constructable
+      // https://stackoverflow.com/a/52732909/3406963
+      // this is not equivalent to the declaration from `getComputedStyle`
+      // e.g `getComputedStyle` would return a readonly declaration
+      // let's hope this doesn't get passed around until it's no longer clear where it comes from
+      const declaration = document.createElement('span').style;
 
       // initial values
       declaration.content = '';