Run npx webpack, which will take our script at src/index.js as the entry point, and will generate dist/main.js as the output. The npx command, which ships with Node 8.2/npm 5.2.0 or higher, runs the webpack binary (./node_modules/.bin/webpack) of the webpack package.

Run with a config: npx webpack --config webpack.config.js

By adding "build":"webpack" to scripts, the npm run build command can be used in place of the npx command.

Run this command to open the Cypress: npx cypress open. By adding "cypress:open": "cypress open" to package.json now you can run npm run cypress:open.