Differences Between Next.js 15 and Previous Versions

To evaluate the differences between Next.js versions 15, 14, and 13, we need to understand the specific changes in the code and features introduced in each version. Here’s a detailed comparison based on various core changes:

Next.js 15

Release Features:

1. Enhanced Turbopack Support:

• Improved support for dynamic imports and basic next/dynamic.
• Enhanced handling of various types of modules and assets.

1. React Updates:

• Updated to latest React versions, ensuring improved performance and features.
• Introduction of new hooks and server actions for better data fetching and state management.

1. Performance Improvements:

• Better image optimizations and enhanced build performance.
• Improved cache management with built-in support for more granular cache controls.

Sample Code Changes:
Changes can be observed in various parts, such as:

javascript

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// Sample procedural change in image optimization
const optimizedImage = nextImageOptimizer.optimize(image, { quality: 'high' });

// Improved API route handling with support for newer React server features
export default async function handler(req, res) {
  const data = await…