Wrong code example

[bobahvas]

Safe option was removed:

function parse(css, opts) {
    if (opts && opts.safe) {
        throw new Error('Option safe was removed. ' + 'Use parser: require("postcss-safe-parser")');
    }
    ...
}

Your example
cssProcessorOptions: { safe: true, discardComments: { removeAll: true } },

[ChiaJune]

have the exact same issue

[NMFR]

See #65