From 6ec259a0e71174651bae95d4628138bf6fd68742 Mon Sep 17 00:00:00 2001
From: kj_sh604
Date: Sun, 15 Mar 2026 16:19:35 -0400
Subject: refactor: packages/

---
 packages/excalidraw/mermaid.ts | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 packages/excalidraw/mermaid.ts

(limited to 'packages/excalidraw/mermaid.ts')

diff --git a/packages/excalidraw/mermaid.ts b/packages/excalidraw/mermaid.ts
new file mode 100644
index 0000000..cb2b400
--- /dev/null
+++ b/packages/excalidraw/mermaid.ts
@@ -0,0 +1,33 @@
+/** heuristically checks whether the text may be a mermaid diagram definition */
+export const isMaybeMermaidDefinition = (text: string) => {
+  const chartTypes = [
+    "flowchart",
+    "graph",
+    "sequenceDiagram",
+    "classDiagram",
+    "stateDiagram",
+    "stateDiagram-v2",
+    "erDiagram",
+    "journey",
+    "gantt",
+    "pie",
+    "quadrantChart",
+    "requirementDiagram",
+    "gitGraph",
+    "C4Context",
+    "mindmap",
+    "timeline",
+    "zenuml",
+    "sankey",
+    "xychart",
+    "block",
+  ];
+
+  const re = new RegExp(
+    `^(?:%%{.*?}%%[\\s\\n]*)?\\b(?:${chartTypes
+      .map((x) => `\\s*${x}(-beta)?`)
+      .join("|")})\\b`,
+  );
+
+  return re.test(text.trim());
+};
-- 
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