Not Compatible with React19/Nextjs15/Vercel

[afroguy16]

Description

Installing nextjs-toploader breaks Vercel deployments with Next.js 15, even when the package is not imported or used in the codebase.

Error Message

TypeError: Cannot read properties of null (reading 'useContext')
    at exports.useContext (/vercel/path0/emu/apps/fsp-chain-demo/node_modules/react/cjs/react.production.js:489:33)
    at h (/vercel/path0/emu/apps/fsp-chain-demo/.next/server/pages/_error.js:1:6051)
    at renderWithHooks (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:4184:18)
    at renderElement (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:4322:14)
    at retryNode (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:4866:16)
    at renderNodeDestructive (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:4684:7)
    at renderNode (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:5123:14)
    at renderChildrenArray (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:5014:7)
    at retryNode (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:4880:9)
    at renderNodeDestructive (/vercel/path0/emu/node_modules/next/node_modules/react-dom/cjs/react-dom-server.edge.production.js:4684:7)
Export encountered an error on /_error: /404, exiting the build.
 ⨯ Static worker exited with code: 1 and signal: null
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Error: Command "yarn run build" exited with 1

Environment

• Monorepo: Turborepo
• Next.js version: 15.0.2
• React version: 19 (19.0.0-rc-02c0e824-20241028)
• Deployment platform: Vercel
• Package manager: Yarn

Steps to Reproduce

1. Setup a Turborepo monorepo
2. Create a Next.js 15 app within the monorepo
3. Add nextjs-toploader to the app's dependencies
4. Deploy to Vercel
5. Build fails with useContext error in error pages

Expected Behavior

The package should not break Vercel deployments when installed, regardless of whether it's being used or not.

Actual Behavior

The mere presence of the package in dependencies causes build failures on Vercel during static page generation.

Additional Notes

• The error occurs even when the package is not imported anywhere in the codebase
• The error occurs even when the package is used in the codebase
• Removing the package from dependencies fixes the build

Screenshots