old_contents: import { each } from 'lodash';
  import mergeConfigs from '../bin/merge-configs';
  
  function validateConfig(config) {
    const errors = [];
    if (!config) {
      errors.push('==>     ERROR: No configuration supplied.');
    }
    if (config.server) {
      if (!config.server.host) {
        errors.push('==>     ERROR: No host parameter supplied.');
      }
      if (!config.server.port) {
        errors.push('==>     ERROR: No port parameter supplied.');
      }
    }
    if (!config.routes) {
      errors.push('==>     ERROR: Must supply routes.');
    }
    if (!config.redux.reducers) {
      errors.push('==>     ERROR: Must supply redux configuration.');
    } else if (!config.redux.reducers) {
      errors.push('==>     ERROR: Must supply reducers.');
    }
    // TODO: check for more
    return errors;
  }
  
  export default (projectConfig) => {
    // since typically the dev server is logging this out too
    projectConfig.verbose = false;
  
    const config = mergeConfigs(projectConfig);
  
    // add user defined globals for serverside access
    each(config.globals, (value, key) => { global[key] = JSON.stringify(value); });
  
    const errors = validateConfig(config);
  
    if (errors.length > 0) {
      each(errors, (error) => { console.error(error); });
      throw new Error('Configuration errors for universal-redux. Stopping.');
    } else {
      console.log('universal-redux configuration is valid.');
    }
  
    return config;
  };
  
new_contents: import { each } from 'lodash';
  import mergeConfigs from '../bin/merge-configs';
  
  function validateConfig(config) {
    const errors = [];
    if (!config) {
      errors.push('==>     ERROR: No configuration supplied.');
    }
    if (config.server) {
      if (!config.server.host) {
        errors.push('==>     ERROR: No host parameter supplied.');
      }
      if (!config.server.port) {
        errors.push('==>     ERROR: No port parameter supplied.');
      }
    }
    if (!config.routes) {
      errors.push('==>     ERROR: Must supply routes.');
    }
    if (!config.redux.reducers) {
      errors.push('==>     ERROR: Must supply redux configuration.');
    }
    // TODO: check for more
    return errors;
  }
  
  export default (projectConfig) => {
    // since typically the dev server is logging this out too
    projectConfig.verbose = false;
  
    const config = mergeConfigs(projectConfig);
  
    // add user defined globals for serverside access
    each(config.globals, (value, key) => { global[key] = JSON.stringify(value); });
  
    const errors = validateConfig(config);
  
    if (errors.length > 0) {
      each(errors, (error) => { console.error(error); });
      throw new Error('Configuration errors for universal-redux. Stopping.');
    } else {
      console.log('universal-redux configuration is valid.');
    }
  
    return config;
  };
  
subject: Remove duplicate check on redux.reducer