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Using setupNodeEvents with Cypress preset

The setupNodeEvents function in a Cypress configuration file allows you to tap into the internal behavior of Cypress using the on and config arguments.

cypress.config.ts
import { defineConfig } from 'cypress';


export default defineConfig({
  e2e: {
    setupNodeEvents(on, config) {
      // e2e testing node events setup code
    },
  },
});

The Cypress preset that Nx provides (@nx/cypress/plugins/cypress-preset) uses setupNodeEvents to start the web server. Thus, if you provide your own function, then you must invoke the setupNodeEvents function that our preset provides.

cypress.config.ts
import { defineConfig } from 'cypress';
import { nxE2EPreset } from '@nx/cypress/plugins/cypress-preset';


const preset = nxE2EPreset(__filename, {
  cypressDir: 'src',
  bundler: 'vite',
  webServerCommands: {
    default: 'nx run my-project:serve',
    production: 'nx run my-project:preview',
  },
  ciWebServerCommand: 'nx run my-project:serve-static',
});


export default defineConfig({
  e2e: {
    ...preset,
    async setupNodeEvents(on, config) {
      // This line sets up the web server as provided via `webServerCommands` and `ciWebServerCommand`
      await preset.setupNodeEvents(on, config);


      // Register your listeners here
    },
  },
});