Mermaid syntax errors are not displayed

Describe the bug When the input file contains a syntax error, the output is “Generating single mermaid chart” and the generated image contains “Syntax error in graph”.

To Reproduce Steps to reproduce the behavior:

I am using the docker container

1. My input file is in $HOME/Mermaid folder
2. Execute : docker run -u 1000 -it --rm -v $HOME/Mermaid:/data minlag/mermaid-cli -i "/data/seq-diagram.mmd" -o "/data/seq-diagram.png"
3. You get the “Generating single mermaid chart” message and the generated image contains “Syntax error in graph”

Inside the container I do not get any other message

1. My input file is in $HOME/Mermaid folder
2. Go inside the container : docker run -u 1000 -it --rm --entrypoint /bin/sh -v $HOME/Progs/Mermaid:/data minlag/mermaid-cli
3. Execute : ./node_modules/.bin/mmdc -p "/puppeteer-config.json" -i "/data/seq-diagram.mmd" -o "/data/seq-diagram.png"
4. You get the “Generating single mermaid chart” message and the generated image contains “Syntax error in graph”

Expected behavior I would like to see the syntax error so that I can fix it

Parse error on line 30:
...ger->>ABC auth->> User    SMS au
-----------------------^
Expecting 'TXT', got 'SOLID_ARROW'

Screenshots

Desktop:

• OS: Ubuntu
• Version 20.04
• Browser inside the container :

$ /usr/bin/chromium-browser --version
Chromium 99.0.4844.84

$ ./node_modules/.bin/mmdc -p "/puppeteer-config.json" --version
8.14.0

Additional context I am not used to JavaScript but it seems like the following question in SO : https://stackoverflow.com/questions/51907677/log-console-calls-made-in-client-side-code-from-the-puppeteer-node-js-process

It seems that you could catch console events that happen in puppeteer / chromium to log them in Node … as I understand it

[MindaugasLaganeckas]

@multimeric Done! https://github.com/mermaid-js/mermaid/pull/3052 Thank you for your help! You are welcome to create PRs for the functionality which is missing in mermaid-cli - I will review them and accept if no issues 😄

[MindaugasLaganeckas]

Thank you! 😄