add `npm run clean` build task to kill all intermediate & output directories. Use this in paranoia mode before you run `npm run build` (or `npm test`, which invokes `npm run build`) to ensure the build process doesn't skip any file.
add `npm run clean` build task to kill all intermediate & output directories. Use this in paranoia mode before you run `npm run build` (or `npm test`, which invokes `npm run build`) to ensure the build process doesn't skip any file.

GerHobbelt/MathJax,GerHobbelt/MathJax