chore: merge blocksuite source code (#9213)

blocksuite/affine/components/src/toast/html-to-element.ts

@@ -0,0 +1,19 @@
+import type { TemplateResult } from 'lit';
+
+/**
+ * DO NOT USE FOR USER INPUT
+ * See https://stackoverflow.com/questions/494143/creating-a-new-dom-element-from-an-html-string-using-built-in-dom-methods-or-pro/35385518#35385518
+ */
+export const htmlToElement = <T extends ChildNode>(
+  html: string | TemplateResult
+) => {
+  const template = document.createElement('template');
+  if (typeof html === 'string') {
+    html = html.trim(); // Never return a text node of whitespace as the result
+    template.innerHTML = html;
+  } else {
+    const htmlString = String.raw(html.strings, ...html.values);
+    template.innerHTML = htmlString;
+  }
+  return template.content.firstChild as T;
+};