1 files changed, 33 insertions, 0 deletions
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());
+};