1. module gulp-image-optimization
   1. function gulp-image-optimization (options)

module gulp-image-optimization

function gulp-image-optimization (options)

• description and source-code

  gulp-image-optimization = function (options) {
      return map(function(file, cb) {
          if (file.isNull()) {
              return cb(null, file);
          }
  
          if (file.isStream()) {
              return cb(new gutil.PluginError('gulp-image-optimization', 'Streaming not supported'));
          }
  
          if (['.jpg', '.jpeg', '.png', '.gif'].indexOf(path.extname(file.path)) === -1) {
              gutil.log('gulp-image-optimization: Skipping unsupported image ' + gutil.colors.blue(file.relative));
              return cb(null, file);
          }
  
          tempWrite(file.contents, path.extname(file.path), function(err, tempFile) {
              if (err) {
                  return cb(new gutil.PluginError('gulp-image-optimization', err));
              }
  
              // workaround: https://github.com/kevva/image-min/issues/8
              fs.stat(tempFile, function(err, stats) {
                  if (err) {
                      return cb(new gutil.PluginError('gulp-image-optimization', err));
                  }
  
                  var origSize = stats.size;
  
                  imagemin(tempFile, tempFile, options, function() {
                      fs.readFile(tempFile, function(err, data) {
                          if (err) {
                              return cb(new gutil.PluginError('gulp-image-optimization', err));
                          }
  
                          var saved = origSize - data.length;
                          var savedMsg = saved > 0 ? 'saved ' + filesize(saved, {
                              round: 1
                          }) : 'already optimized';
  
                          gutil.log('gulp-image-optimization:', gutil.colors.green('✔ ') + file.relative + gutil.colors.gray(' (' +
  savedMsg + ')'));
  
                          file.contents = data;
                          cb(null, file);
                      });
                  });
              });
          });
      }, 10);
  }

• example usage

  n/a