message: REMOVE customElements shim since jsdom supports it now
diff: @@ -308,25 +308,5 @@ export function addShimsToJSDOM(window) {
  writable: true,
  });
  - const customElements = {};
  - Object.defineProperty(window, 'customElements', {
  - value: {
  - define: (name, constructor) => {
  - customElements[name] = customElements[name] || { resolvers: [] };
  - customElements[name].constructor = constructor;
  - customElements[name].resolvers.forEach(resolve => resolve());
  - },
  - get: name => customElements[name] && customElements[name].constructor,
  - upgrade: () => {},
  - whenDefined: name =>
  - new Promise(resolve => {
  - customElements[name] = customElements[name] || { resolvers: [] };
  - if (customElements[name].constructor) resolve();
  - else customElements[name].resolvers.push(resolve);
  - }),
  - },
  - writable: false,
  - });
  -
  mockCanvas(window);
  }
  