first commit

calcom/packages/lib/turndownService.ts

@@ -0,0 +1,56 @@
+import TurndownService from "turndown";
+
+const turndownService = new TurndownService();
+
+function turndown(html: string | TurndownService.Node): string {
+  let result = turndownService.turndown(html);
+  result = result.replaceAll("[<p><br></p>]", "");
+
+  if (result === "<p><br></p>") {
+    result = "";
+  }
+
+  return result;
+}
+
+turndownService.addRule("shiftEnter", {
+  filter: function (node) {
+    return node.nodeName === "BR" && !!isShiftEnter(node);
+  },
+  replacement: function () {
+    return "<br>";
+  },
+});
+
+turndownService.addRule("enter", {
+  filter: function (node) {
+    return node.nodeName === "BR" && !isShiftEnter(node);
+  },
+  replacement: function () {
+    return "<p><br></p>";
+  },
+});
+
+turndownService.addRule("ignoreEmphasized", {
+  filter: "em",
+  replacement: function (content) {
+    return content;
+  },
+});
+
+function isShiftEnter(node: HTMLElement) {
+  let currentNode: HTMLElement | null | ParentNode = node;
+
+  while (currentNode != null && currentNode.nodeType !== 1) {
+    currentNode = currentNode.parentElement || currentNode.parentNode;
+  }
+
+  return (
+    currentNode &&
+    currentNode.nodeType === 1 &&
+    currentNode.parentElement &&
+    currentNode.parentElement.childNodes.length !== 1 // normal enter is <p><br><p> (p has exactly one childNode)
+  );
+}
+
+export default turndown;