Add blacklist option

[bangzek]

Writing the right extractor is hard and sometime you can over specify the selector.

Can we add blacklist that force to remove certain selector even when the extractor pull it?

[makenosound]

I’d be interested in this feature too so that I can explicitly remove a bunch of (library generated) classes that I know should be filtered out. The existing configuration options make this sort of use-case fairly convoluted (and potentially error prone).

[adamwathan]

You can use the extractor to manually do this in the mean time:

purgecss({
  defaultExtractor: content => {
    const blacklist = [
      'class-i-dont-want',
      'another-class-i-dont-want',
    ]

    return (content.match(/[\w-/.:]+(?<!:)/g) || []).filter(match => !blacklist.includes(match))
  }
})

[Ffloriel]

Progress tracked in #439