Astro Integration System (#2820)

* update examples

* add initial integrations

* update tests

* update astro

* update ci

* get final tests working

* update injectelement todo

* update ben code review

* respond to final code review feedback

1 files changed, 10 insertions, 0 deletions

diff --git a/packages/integrations/lit/client-shim.js b/packages/integrations/lit/client-shim.js
new file mode 100644
index 000000000..cab3fe4d9
--- /dev/null
+++ b/packages/integrations/lit/client-shim.js
@@ -0,0 +1,10 @@
+async function polyfill() {
+	const { hydrateShadowRoots } = await import('@webcomponents/template-shadowroot/template-shadowroot.js');
+	hydrateShadowRoots(document.body);
+}
+
+const polyfillCheckEl = new DOMParser().parseFromString(`<p><template shadowroot="open"></template></p>`, 'text/html', { includeShadowRoots: true }).querySelector('p');
+
+if (!polyfillCheckEl || !polyfillCheckEl.shadowRoot) {
+	polyfill();
+}