npm run build and modify the webpack.config.js to take advantage of react hot module reload (react-hmr), for faster front-end development.locals[0] does not appear to be a 'module' object with Hot Module replacement API enabled. This can happen when the NODE_ENV is blank. To fix the issue, set the NODE_ENV to a non-empty value, then run the build again.DEBUG=* node . or you can spell out which packages you want to show debug output, e.g. DEBUG=express*,swagger* node ..npm run lint and npm run jscs.node_modules/.bin/sequelize migration:create --name example-name. Note: be sure to wrap your migration code inside a transaction. This ensures that all migration operations are successful before committing changes to the database. This minimizes the possibility of a failed partial migration during release phase.Execute any of the scripts in the scripts section of ./package.json by calling npm run [SCRIPTNAME], e.g. npm run test or npm run lint or npm run start.