1. module gulp-cssnano
   1. function gulp-cssnano (opts)

module gulp-cssnano

function gulp-cssnano (opts)

• description and source-code

  gulp-cssnano = function (opts) {
      opts = opts || {};
      var stream = new Transform({objectMode: true});
  
      stream._transform = function (file, encoding, cb) {
          if (file.isNull()) {
              return cb(null, file);
          }
          if (file.isStream()) {
              var error = 'Streaming not supported';
              return cb(new PluginError(PLUGIN_NAME, error));
          } else if (file.isBuffer()) {
              nano.process(String(file.contents), assign(opts, {
                  map: (file.sourceMap) ? {annotation: false} : false,
                  from: file.relative,
                  to: file.relative
              })).then(function (result) {
                  if (result.map && file.sourceMap) {
                      applySourceMap(file, String(result.map));
                  }
                  file.contents = new Buffer(result.css);
                  this.push(file);
                  cb();
              }.bind(this))
              .catch(function (error) {
                    var errorOptions = {fileName: file.path};
                    if (error.name === 'CssSyntaxError') {
                       error = error.message + error.showSourceCode();
                       errorOptions.showStack = false;
                    }
                   // Prevent stream’s unhandled exception from
                   // being suppressed by Promise
                   setImmediate(function () {
                       cb(new PluginError(PLUGIN_NAME, error));
                   });
              });
          }
      };
  
      return stream;
  }

• example usage

  n/a