universal-webpack/es6/prepare.js

Isomorphic Webpack

import path from 'path';
import fs from 'fs-extra'; // Creates (or cleans) the server-side build folder.
//
// That's needed because Nodemon, for example,
// needs the folder to exist by the time it runs,
// otherwise it won't detect any changes to the code
// and therefore won't restart on code changes.
//

export default function prepare(settings, project_base_path) {
  // By default, Webpack sets `.context` to `process.cwd()`
  var base_path = project_base_path || process.cwd();

  if (!settings.server.output) {
    throw new Error('`settings.server.output` not specified');
  }

  var server_build_bundle_path = path.resolve(base_path, settings.server.output);
  var server_build_folder = path.dirname(server_build_bundle_path); // Extra caution to prevent data loss

  if (server_build_folder === path.normalize(base_path)) {
    throw new Error('`settings.server.output` "' + server_build_folder + '" points to the project root folder. Won\'t clear that folder to prevent accidental data loss.');
  } // Extra caution to prevent data loss


  if (server_build_folder.indexOf(base_path) !== 0) {
    throw new Error('`settings.server.output` "' + server_build_folder + '" points outside of the project root folder "' + base_path + '". Won\'t clear that folder to prevent accidental data loss');
  }

  fs.emptyDirSync(server_build_folder);
}
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