code: function parsePlugins(config) {
    let plugins = [];
  
    function parse(plugins) {
      return plugins.map(plugin => {
        if ('string' == typeof plugin) plugin = path.resolve(plugin);
        return plugin;
      });
    }
  
    // Handle plugin paths defined in config file
    if (config.plugins) {
      plugins.push(...parse(config.plugins));
      delete config.plugins;
    }
    // Handle plugin paths/functions defined in runtime options
    if (config.runtimeOptions.plugins) {
      plugins.push(...parse(config.runtimeOptions.plugins));
      delete config.runtimeOptions.plugins;
    }
  
    return plugins;
  }
docs: Parse plugins defined in 'config'
  @param {Config} config
  @returns {Array}