code: function getPackageName(content, pluginLookup, identifierPath) {
    let memberPath = identifierPath.parentPath;
    while (memberPath.isMemberExpression()) {
      const code = content.slice(identifierPath.node.end, memberPath.node.end);
      const pluginName = pluginLookup[code];
      if (pluginName) {
        return pluginName;
      }
  
      memberPath = memberPath.parentPath;
    }
  
    return '';
  }
docs: Get the package name from the identifier call path.
  @example With code `$.jshint()` and `$` as path, returns `gulp-jshint` string.