jQuery 4.0 Modern Coding Skill

This skill provides guidance for writing modern jQuery code compatible with jQuery 4.0.0+ (released January 2026).

When to Use This Skill

• Writing new jQuery code in projects using jQuery 4.0+
• Migrating legacy jQuery code from versions 1.x-3.x to 4.0
• Reviewing jQuery code for deprecated API usage
• Optimizing jQuery performance
• Integrating jQuery with TypeScript

Critical: Banned APIs in jQuery 4.0

The following APIs were removed in jQuery 4.0 and must never be used. Replace with native JavaScript equivalents: