WebStorm 2025.3: New Type Engine, AI Assistants & Remote Debugging

Introduction

JetBrains has launched WebStorm 2025.3, a significant update for JavaScript and TypeScript developers. This release focuses on core infrastructure, delivering a new service-powered type engine for superior TypeScript intelligence and major improvements for monorepo workflows. It also expands AI assistance and remote debugging, solidifying its position as a top-tier IDE for modern web development.

Core Engine and Workflow Upgrades

The headline feature is the gradual rollout of a new type engine. This backend service promises more accurate and performant TypeScript type evaluation, directly impacting developer productivity by reducing false errors and improving code insight. For teams managing complex codebases, module resolution and monorepo support have been refined, with specific optimizations for pnpm and Nx workspaces. This makes navigating and building large-scale projects significantly smoother.

Enhanced AI and Development Tools

WebStorm's integrated AI assistant becomes more versatile, now supporting both Claude and the Junie agent within a single chat interface. This provides developers with broader, more interactive code assistance and explanations. For debugging, capabilities are now extended to remote environments, including debugger sessions within Windows Subsystem for Linux (WSL), Docker containers, and dev containers. A new option to launch a local browser during these remote sessions streamlines testing and inspection of web applications.

Front-End and Testing Improvements

Front-end developers gain support for Webref-aligned CSS syntax, incorporating modern spec features like the round(), rem(), and mod() functions. Environment management is simplified with a unified settings page for JavaScript runtimes (Node.js, Bun, Deno). For test suites, official support for Vitest 4 ensures correct discovery and execution. The update also includes numerous fixes for frameworks like Angular, Vue, and Astro, enhancing overall stability.

Pros and Cons

Advantages

• New type engine delivers more accurate TypeScript analysis.
• Excellent monorepo support for pnpm and Nx workflows.
• Unified AI chat with Claude and Junie for better assistance.
• Expanded remote debugging for WSL, Docker, and containers.
• Support for latest CSS features and Vitest 4.
• Consolidated runtime settings for Node.js, Bun, and Deno.
• Numerous framework-specific fixes improve daily use.

Disadvantages

• New type engine is a gradual rollout, not immediately for all.
• Advanced AI features may require separate subscriptions.
• Increased complexity for beginners due to many new options.

Conclusion

WebStorm 2025.3 is a substantial, engineering-focused update that strengthens its foundation for professional development. By enhancing its type system, monorepo tooling, and remote debugging, it addresses the complex needs of modern web teams. The boosted AI assistance and updated framework support ensure developers can work more efficiently across the entire stack, from backend services to front-end UI.