- Get familar with jison
- git graph requires a blank line at the end. why?
- Setup code coverage
- Create a desktop client
- Support customization of gantt diagram xAxis format
    - https://github.com/d3/d3-time-format#api-reference
    - https://bl.ocks.org/wboykinm/34627426d84f3242e0e6ecb2339e9065
- Upgrade jasmine to latest version or replace it
    - Replace it with Jest
- Flowchart interpolate is useless because there is no rendering code using it
- Rewrite SCSS code to reduce duplication
    - No global CSS. Should limit the CSS to mermaid charts only