In the root level of your testing folder, install the @axe-core/watcher package and all of its dependencies using npm or your preferred package manager (for example, Yarn or pnpm).

npm install --save-dev @axe-core/watcher

In cypress.config.js, import the cypressConfig function from the @axe-core/watcher package and wrap your config with it:

const { defineConfig } = require('cypress');
const { cypressConfig } = require('@axe-core/watcher');

const API_KEY = process.env.API_KEY

module.exports = defineConfig(  
  cypressConfig({
    axe: {
      apiKey: API_KEY
    },
    // Your existing Cypress configuration code here
  })
);

In your Cypress support file (commonly called cypress/support/e2e.js), import the @axe-core/watcher package Cypress commands and call axeWatcherFlush() after each test:

require('@axe-core/watcher/dist/cypressCommands');

afterEach(() => {
  cy.axeWatcherFlush();
});

You're all done. Run your end-to-end tests and check your results. Please note @axe-core/watcher only runs in Chrome and should only be used in Cypress run mode. It may be used with --headless=new or --headed (for example, cypress run --headed --browser=chrome).