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Error: Objects are not valid as a React child ... #1387

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@jay-linumlabs

Description

Description:
Integrating vitest with a fresh nextJS application results in the following error:

Error: Objects are not valid as a React child (found: object with keys {$$typeof, type, key, props, _owner, _store}). If you meant to render a collection of children, use an array instead.
 ❯ throwOnInvalidObjectType ../../node_modules/react-dom/cjs/react-dom.development.js:13123:9
 ❯ reconcileChildFibers ../../node_modules/react-dom/cjs/react-dom.development.js:14064:7
 ❯ reconcileChildren ../../node_modules/react-dom/cjs/react-dom.development.js:19193:28
 ❯ updateHostRoot ../../node_modules/react-dom/cjs/react-dom.development.js:19912:5
 ❯ beginWork ../../node_modules/react-dom/cjs/react-dom.development.js:21654:14
 ❯ beginWork1ドル ../../node_modules/react-dom/cjs/react-dom.development.js:27465:14
 ❯ performUnitOfWork ../../node_modules/react-dom/cjs/react-dom.development.js:26599:12
 ❯ workLoopSync ../../node_modules/react-dom/cjs/react-dom.development.js:26505:5
 ❯ renderRootSync ../../node_modules/react-dom/cjs/react-dom.development.js:26473:7
 ❯ performConcurrentWorkOnRoot ../../node_modules/react-dom/cjs/react-dom.development.js:25777:74

This uses React 19.

If I downgrade to React 18 it works:

Working Screenshot:

Image

Working package.json

{
 "name": "web",
 "version": "0.1.0",
 "private": true,
 "scripts": {
 "dev": "next dev --turbopack",
 "build": "next build",
 "start": "next start",
 "lint": "next lint",
 "check-types": "tsc --noEmit",
 "test": "vitest run",
 "test:coverage": "vitest run --coverage",
 "test:watch": "vitest run --watch"
 },
 "dependencies": {
 "next": "15.2.3",
 "react": "18.3.1",
 "react-dom": "18.3.1"
 },
 "devDependencies": {
 ...
 "@types/react": "^18.3.1",
 "@types/react-dom": "^18.3.1",
 ...
 "vitest": "^3.0.9",
 "@testing-library/dom": "^10.4.0",
 "@testing-library/jest-dom": "^6.6.3",
 "@testing-library/react": "^16.2.0",
 "@testing-library/react-native": "^13.2.0",
 "@types/react-dom": "^19.0.4",
 "@vitejs/plugin-react": "^4.3.4",
 }
}

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