Hello JavaScript Enthusiasts! Welcome to a new edition of "This Week in JavaScript"! This Week in JavaScript Today, we're covering major VSCode improvements, the long-awaited k6 1.0 release, Node.js 24 features, and a roundup of essential tools you should know about! Node.js 24: More Power, More Features Node.js 24: More Power, More Features Node.js 24 has landed with significant improvements across the board: Node.js 24 has landed with significant improvements Node.js 24 has landed with significant improvements Major Updates: Major Updates: V8 13.6: Adds support for Float16Array, explicit resource management, and RegExp.escape.
npm 11: Improved performance and enhanced security features.
AsyncLocalStorage Overhaul: Now uses AsyncContextFrame by default for more efficient context tracking.
URLPattern Goes Global: Available without explicit imports.
Permission Model Improvements: Flag simplified from --experimental-permission to just --permission.
Test Runner Enhancements: Automatically waits for subtests to finish. V8 13.6: Adds support for Float16Array, explicit resource management, and RegExp.escape. V8 13.6: npm 11: Improved performance and enhanced security features. npm 11: AsyncLocalStorage Overhaul: Now uses AsyncContextFrame by default for more efficient context tracking. URLPattern Goes Global: Available without explicit imports. URLPattern Goes Global: Permission Model Improvements: Flag simplified from --experimental-permission to just --permission. Permission Model Improvements: Test Runner Enhancements: Automatically waits for subtests to finish. Test Runner Enhancements: This release will enter long-term support in October, offering a solid foundation for your production applications. Visual Studio Code 1.100: AI Gets Personal Visual Studio Code 1.100: AI Gets Personal Visual Studio Code just hit version 1.100, and it's a game-changer for AI-assisted coding: Visual Studio Code just hit version 1.100 Visual Studio Code just hit version 1.100 Key Highlights: Key Highlights: Custom Instructions: Create .instructions.md files to set personal guidelines for the AI model – think code style preferences and framework choices.
Reusable Prompts: Save common chat requests with .prompt.md files for repetitive tasks.
Faster Agent Mode: Dramatic speed improvements for large files with new editing formats from both OpenAI and Anthropic.
Multi-Window Support: Enhanced experience when working with chat and editors across multiple windows. Custom Instructions: Create .instructions.md files to set personal guidelines for the AI model – think code style preferences and framework choices. Custom Instructions: Reusable Prompts: Save common chat requests with .prompt.md files for repetitive tasks. Reusable Prompts: Faster Agent Mode: Dramatic speed improvements for large files with new editing formats from both OpenAI and Anthropic. Faster Agent Mode: Multi-Window Support: Enhanced experience when working with chat and editors across multiple windows. Multi-Window Support: This release transforms how the AI assistant understands your coding style, making it feel like it's truly part of your development team. k6 Hits 1.0: JavaScript Load Testing Grows Up k6 Hits 1.0: JavaScript Load Testing Grows Up After years of development, k6 has officially reached version 1.0, offering a mature solution for realistic load testing: k6 has officially reached version 1.0 k6 has officially reached version 1.0 What Makes It Special: What Makes It Special: Tests as Code: Write load tests in JavaScript that can be version-controlled and integrated with CI pipelines.
Powerful Performance: Built on Go for efficiency, but with a familiar JavaScript API for web developers.
Multi-Protocol Support: Works with HTTP, WebSockets, gRPC, Browser interactions, and more.
Realistic Traffic Simulation: Generate significant load even on modest hardware. Tests as Code: Write load tests in JavaScript that can be version-controlled and integrated with CI pipelines. Tests as Code: Powerful Performance: Built on Go for efficiency, but with a familiar JavaScript API for web developers. Powerful Performance: Multi-Protocol Support: Works with HTTP, WebSockets, gRPC, Browser interactions, and more. Multi-Protocol Support: Realistic Traffic Simulation: Generate significant load even on modest hardware. Realistic Traffic Simulation: Perfect for ensuring your applications can handle real-world traffic patterns before issues arise in production. Tools & Releases You Should Know About Tools & Releases You Should Know About Let's speed-run through some of the other big tool updates this week! ESLint v9.26.0: Your linter just got superintelligent with AI integration! The new Model Context Protocol server lets GitHub Copilot run linting commands directly in your workflow, while new protection against globalThis shadowing eliminates those weekend-ruining bugs that plague JavaScript developers.
Mapbox GL JS 3.12: Transform boring maps into breathtaking 3D masterpieces with experimental road intersections and shadow rendering for elevated lines. With butter-smooth pattern transitions and performance improvements, your users might spend more time admiring your maps than using your app!
Relay v19: The GraphQL type-safety guardian angel you never knew you needed! Required @alias directives on conditional fragments save you from mysterious runtime errors, while the included codemod automatically fixes your existing code while you grab coffee.
Electron 36: Making web devs feel like native app wizards with Chromium 136, V8 13.6, and Node 22.14.0 in one powerful package. The showstopper? macOS Writing Tools integration that gives your desktop apps spell-checking capabilities that would make Grammarly jealous.
Mantine 8.0: The React UI library that finally fixed time zones! Featuring deeply nested menu submenus, a TimePicker component that makes dealing with time actually enjoyable, and string-based date values that finally end those timezone headaches that had you considering a career change. ESLint v9.26.0: Your linter just got superintelligent with AI integration! The new Model Context Protocol server lets GitHub Copilot run linting commands directly in your workflow, while new protection against globalThis shadowing eliminates those weekend-ruining bugs that plague JavaScript developers. ESLint v9.26.0: Mapbox GL JS 3.12: Transform boring maps into breathtaking 3D masterpieces with experimental road intersections and shadow rendering for elevated lines. With butter-smooth pattern transitions and performance improvements, your users might spend more time admiring your maps than using your app! Mapbox GL JS 3.12: Relay v19: The GraphQL type-safety guardian angel you never knew you needed! Required @alias directives on conditional fragments save you from mysterious runtime errors, while the included codemod automatically fixes your existing code while you grab coffee. Relay v19: Electron 36: Making web devs feel like native app wizards with Chromium 136, V8 13.6, and Node 22.14.0 in one powerful package. The showstopper? macOS Writing Tools integration that gives your desktop apps spell-checking capabilities that would make Grammarly jealous. Electron 36: Mantine 8.0: The React UI library that finally fixed time zones! Featuring deeply nested menu submenus, a TimePicker component that makes dealing with time actually enjoyable, and string-based date values that finally end those timezone headaches that had you considering a career change. Mantine 8.0: And that's it for the thirty-fourth issue of "This Week in JavaScript." This Week in JavaScript. Feel free to share this newsletter with a fellow developer, and make sure you're following for more weekly updates.

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