{"id":673,"hash":"407cf0084ff2c1f0751e475d18df6c5d53e461bf65a077c2775627f25c943ded","pattern":"Vitest Error : React refresh preamble was not loaded. Something is wrong","full_message":"I am new to testing and I was trying to use vitest for testing my mern social media app. looking for references to test a react component using vitest i found this article https://eternaldev.com/blog/testing-a-react-application-with-vitest. following this when i try to render a component i get the error React refresh preamble was not loaded. Something is wrong on running tests . below are relevant codes :\n\nregister.test.tsx\n\nimport { expect, test, describe } from 'vitest';\nimport { render, screen } from '@testing-library/react';\n// import Register from '../../components/Authentication/Register';\nimport Fake from '../../Fake';\n\ndescribe('Registration Component Full functionality testing', () => {\n\n test(\"should be showing Signup heading\", () => {\n\n render();\n expect(screen.getByText(/Fake/i)).toBeDefined()\n })\n})\n\nFake.tsx\n\nimport React from 'react'\n\nconst Fake: React.FC = () => {\n return (\n Fake
\n )\n}\n\nexport default Fake\n\nvite.config.ts\n\n/// \n/// \n\nimport { defineConfig } from 'vite'\nimport react from '@vitejs/plugin-react-swc'\n\n// https://vitejs.dev/config/\nexport default defineConfig({\n plugins: [react()],\n test: {\n globals: true,\n environment: 'jsdom',\n setupFiles: './setupTest.ts'\n }\n})\n\nI am open to share more information about my codebase if required . thanks.\n\nI was trying to render a react component in a test coded using vitest but was getting the error React refresh preamble was not loaded. Something is wrong on doing so.\nI am expecting any one who knows the answer to deliver a structured answer along with the explanation for what was missing or what was wrong .","ecosystem":"npm","package_name":"typescript","package_version":null,"solution":"If you are using Laravel just add @viteReactRefresh into the HTML head in your Laravel blade file: app.blade.php / welcome.blade.php\n\n \n \n \n \n \n Laravel\n @viteReactRefresh \n @vite(['resources/css/app.css', 'resources/js/Website/app.jsx'])\n @inertiaHead\n \n \n @inertia\n \n\n\nPlease ensure you're using updated version of plugin-react:\n\n\"@vitejs/plugin-react\": \"^4.2.1\"","confidence":0.95,"source":"stackoverflow","source_url":"https://stackoverflow.com/questions/76854172/vitest-error-react-refresh-preamble-was-not-loaded-something-is-wrong","votes":11,"created_at":"2026-04-19T04:51:28.853204+00:00","updated_at":"2026-04-19T04:51:28.853204+00:00"}