How to use the uncss function in uncss
To help you get started, we’ve selected a few uncss examples, based on popular ways it is used in public projects.
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posthtml / htmlnano / lib / modules / removeUnusedCss.es6 View on Github 
return new Promise((resolve, reject) => {
options.raw = css;
uncss(html, options, (error, output) => {
if (error) {
reject(error);
return;
}
resolve(output);
});
});
}
