From 0cab66c9d81ea2f48485a2c4bf2c187c06a01fbf Mon Sep 17 00:00:00 2001
From: Lishid <lishid@gmail.com>
Date: Thu, 29 Jun 2023 15:33:35 -0400
Subject: [PATCH] Fix flowchart tooltip typing

Tooltip is an object that gets reset to an array. It is then looked up for properties without guard, causing array functions like "length" and "constructor" to run into undefined behvaior.
---
 packages/mermaid/src/diagrams/flowchart/flowDb.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/mermaid/src/diagrams/flowchart/flowDb.js b/packages/mermaid/src/diagrams/flowchart/flowDb.js
index ceb933e85..81a9afb94 100644
--- a/packages/mermaid/src/diagrams/flowchart/flowDb.js
+++ b/packages/mermaid/src/diagrams/flowchart/flowDb.js
@@ -342,7 +342,8 @@ export const setLink = function (ids, linkStr, target) {
   setClass(ids, 'clickable');
 };
 export const getTooltip = function (id) {
-  return tooltips[id];
+  if (tooltips.hasOwnProperty(id)) return tooltips[id];
+  return undefined;
 };
 
 /**
@@ -443,7 +444,7 @@ export const clear = function (ver = 'gen-1') {
   subGraphs = [];
   subGraphLookup = {};
   subCount = 0;
-  tooltips = [];
+  tooltips = {};
   firstGraphFlag = true;
   version = ver;
   commonClear();