From 66a0bc3a11d28ddb33db511aba01c55221f1c735 Mon Sep 17 00:00:00 2001
From: Guillaume Grossetie <ggrossetie@yuzutech.fr>
Date: Sun, 20 Aug 2023 12:31:11 +0200
Subject: [PATCH] Extract error message/stack (#1619)

---
 mermaid/src/worker.js         | 9 ++++++++-
 mermaid/test/convert-test.mjs | 2 +-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/mermaid/src/worker.js b/mermaid/src/worker.js
index 2e82fff3d..dc1ac2b19 100644
--- a/mermaid/src/worker.js
+++ b/mermaid/src/worker.js
@@ -74,7 +74,14 @@ export class Worker {
           const { svg } = await window.mermaid.render('container', definition)
           return { svg, error: null }
         } catch (err) {
-          return { svg: null, error: err }
+          return {
+            svg: null,
+            error: {
+              name: 'name' in err && err.name,
+              message: 'message' in err && err.message,
+              stack: 'stack' in err && err.stack
+            }
+          }
         }
       }, task.source, mermaidConfig)
       successfulSpan(span)
diff --git a/mermaid/test/convert-test.mjs b/mermaid/test/convert-test.mjs
index a8b5181a1..c97a30b2c 100644
--- a/mermaid/test/convert-test.mjs
+++ b/mermaid/test/convert-test.mjs
@@ -96,7 +96,7 @@ describe('#convert', function () {
         await new Worker(browser).convert(new Task('not a valid mermaid code', testCase.isPng))
         expect.fail('Should throw a SyntaxError exception')
       } catch (err) {
-        expect(err.message).to.equal('Syntax error in graph: {"name":"UnknownDiagramError"}')
+        expect(err.message).to.be.a('string').and.satisfy(msg => msg.startsWith('Syntax error in graph: {"name":"UnknownDiagramError"'), 'Error message should starts with \'Syntax error in graph: {"name":"UnknownDiagramError\'')
       } finally {
         await browser.close()
       }