fix: Illegal constructor

mui · Nov 28, 2019 · 4be4622 · 4be4622
1 parent dacacce
commit 4be4622
Showing 1 changed file with 6 additions and 1 deletion.
diff --git 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 = '';