Replace gulp-clean-css with gulp-csso (Case 161784) #32
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polarbirke
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This is a continuation of the problem-solving started in #28 and #29.
gulp-clean-css has probably become stale (with its author completely unresponsive), and while clean-css still is the most downloaded CSS minification package on npm, its author has put the project into "maintenance mode" and will no longer actively work on it.
CSSO is a CSS minifier that has been around almost as long (since 2015) as clean-css (since 2011). Minification is significantly faster than clean-css.
Downsides:
As it is logical to first purge unused CSS before performing any other transformations on the remaining code, the order of the postcss plugins is adjusted accordingly.