code: function dereference(file, opts, cb) {
  	parser.dereference(file.path, opts, (err, schema) => {
  		if (err) {
  			this.emit('error', new gutil.PluginError('gulp-jsonschema-deref', err, {fileName: file.path}));
  		} else {
  			file.contents = Buffer.from(JSON.stringify(schema));
  			this.push(file);
  		}
  		cb();
  	});
  }
docs: Dereference a jsonschema