Upgrade to Next.js 16.1.1 with React 19.2.3

[Copilot]

Upgrades the project from Next.js 15.5.9 to 16.1.1 and React 19.1.0 to 19.2.3 using the official upgrade toolchain and migration guide.

Version Updates

• Next.js: 15.5.9 → 16.1.1
• React & React DOM: 19.1.0 → 19.2.3
• @types/react: ^19 → 19.2.8 (with npm overrides for version consistency)
• eslint-config-next: 15.5.4 → 16.1.1

Configuration Changes

next.config.ts

• Removed eslint configuration object (no longer supported; ESLint config now lives in eslint.config.mjs)

package.json

• Removed --turbopack flags from dev/build scripts (Turbopack is default in v16)
• Added npm overrides for React type definitions to prevent version conflicts

tsconfig.json

• Added .next/dev/types/**/*.ts to include array (Next.js 16 requirement)
• Updated jsx from preserve to react-jsx (React 19 automatic runtime)

Next.js 16 Features Now Available

• Turbopack as default bundler (no flag needed)
• React 19 with automatic JSX runtime
• Cache Components (opt-in via cacheComponents: true)
• Activity component for navigation state preservation
• Improved error messages and build output

Migration Notes

• No breaking changes detected in existing codebase
• All 21 routes build successfully as static exports
• No deprecated features (AMP, runtime config, PPR flags) in use
• No middleware requiring proxy migration

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Project	Deployment	Review	Updated (UTC)
code-storm	Ready	Preview, Comment	Jan 13, 2026 11:08am