Some previews in the Flowchart documentation are failing

[kimulaco]

Description

Hi, thanks for maintaining this great library!

On the Flowchart documentation page, some previews fail to render, displaying multiple errors:
Syntax error in text mermaid version 11.6.0
https://mermaid.js.org/syntax/flowchart.html

Additionally, I see errors in the console, such as:

Error: Lexical error on line 2. Unrecognized text.
flowchart LR  A e1@–> B
-------------------^
    at Y1.parseError (flowDiagram-RXJ4TZVH.CdDNEOTH.js:9:33370)
    at Object.parseError (flowDiagram-RXJ4TZVH.CdDNEOTH.js:11:1245)
    at Object.next (flowDiagram-RXJ4TZVH.CdDNEOTH.js:13:1822)
    at Object.lex (flowDiagram-RXJ4TZVH.CdDNEOTH.js:14:101)
    at lex (flowDiagram-RXJ4TZVH.CdDNEOTH.js:9:34085)
    at Y1.parse (flowDiagram-RXJ4TZVH.CdDNEOTH.js:9:34331)
    at Vt.parse (flowDiagram-RXJ4TZVH.CdDNEOTH.js:15:14)
    at Diagram.fromText (theme.DKjXgAIk.js:208:300)
    at Object.render (theme.DKjXgAIk.js:215:1257)
    at theme.DKjXgAIk.js:215:5759

Steps to reproduce

1. Open the Flowchart documentation page.
   https://mermaid.js.org/syntax/flowchart.html

Screenshots

Code Sample

Setup

• Mermaid version: 11.6.0
• Browser and Version: [Chrome 135, Safari 18.4, Firefox 137]

Suggested Solutions

The following preview is failing.

• https://mermaid.js.org/syntax/flowchart.html#attaching-an-id-to-edges
• https://mermaid.js.org/syntax/flowchart.html#selecting-type-of-animation
• https://mermaid.js.org/syntax/flowchart.html#using-classdef-statements-for-animations

Additional Context

• The issue also occurs on the develop branch.

[knsv]

This should be fixed! Thanks for raising it.

[nour0205]

Hello @kimulaco
I’ve submitted a PR to fix the broken example in the “Attaching an ID to Edges” section of the Flowchart documentation.

The issue was caused by using e1@-> instead of the correct e1@-->, which led to a parsing error in Mermaid v11.6.0.

PR: #6456

Could you please take a look and review it when you get a chance?
Thanks again for your amazing work on this library!