Talks from our events
React Summit 2025
React Summit 2025
Jun 13 - 17, 2025
JSNation 2025
JSNation 2025
Jun 12 - 16, 2025
Node Congress 2025
Node Congress 2025
Apr 17, 2025
Productivity Conf for Devs and Tech Leaders
Productivity Conf for Devs and Tech Leaders
Mar 27 - 28, 2025
React Day Berlin 2024
React Day Berlin 2024
Dec 13 - 16, 2024
React Summit US 2024
React Summit US 2024
Nov 18 - 22, 2024
JSNation US 2024
JSNation US 2024
Nov 18 - 21, 2024
React Advanced 2024
React Advanced 2024
Oct 25 - 29, 2024
TechLead Conference 2024
TechLead Conference 2024
Jun 15 - 19, 2024
React Summit 2024
React Summit 2024
Jun 14 - 18, 2024
C3 Dev Festival 2024
C3 Dev Festival 2024
Jun 14 - 15, 2024
JSNation 2024
JSNation 2024
Jun 13 - 17, 2024
Latest
All talks
AI-Powered Frontend Development: Building Better UIs Faster
React Summit 2025React Summit 2025
19 min
AI-Powered Frontend Development: Building Better UIs Faster
Discussing building better UIs faster with AI, emphasizing the use of LLMs as predictive text models and the need to maximize their smart aspects in coding and UI development. Exploring file context management in Cursor IDE and demonstrating quick UI updates using AI for coding efficiency and real-time results. Discussing advanced workflows for efficient development using feedback-driven approaches and incorporating test-driven development for iterative and automated testing in Cursor IDE. Exploring advanced prompt tricks in Cursor IDE for efficient development by writing tests first, updating code iteratively, and enabling autorun mode for automated testing and bash commands. Cursor's Annoying Prompt Behavior, Automated Testing Benefits, and Test-Driven Development for Reliable Code. AI Feedback Importance and AI Testing Complexity with Clear Goals. AI Challenges, Visual Front-End Focus, and Fusion Preview. Integration of Figma Designs for Visual Tweaks, Exploring New Features and Design Systems, Updating Customers Tab and Making Visual Edits, Making Carousel and Visual Updates, Granular Design Updates and AI Integration, Dynamic Updates and Component Refactoring, Tagging Builder Bot for Automated Code Updates.
Web Almanac 2024: Is the Web Sustainable?
JSNation 2025JSNation 2025
13 min
Web Almanac 2024: Is the Web Sustainable?
Burak discusses web sustainability and introduces the Web Almanac report, focusing on the sustainability chapter. Analysis of web page data load improvements between 2022 and 2024 despite exceeding recommended limits. Concerns about the increase in unused CSS and JavaScript data waste in 2024 compared to 2022. Discussion on image optimization techniques like lazy loading and responsive image types. Emphasis on optimizing data transfer through techniques like text compression. Strategies for web optimization include caching, image optimizations, and text compression. Solutions for web page sustainability involve caching, image optimizations, and text compression. Exploring text compression with gzip, optimizing page weight, and addressing green hosting complexities. Addressing website sustainability's cost and emissions, calling for contributors and volunteers.
Zero-Styling Development: Utopia or the Future of Frontend?
React Summit 2025React Summit 2025
7 min
Zero-Styling Development: Utopia or the Future of Frontend?
Mateusz Jagodziński presenting on Zero Styling Development and the challenges faced with manual styling implementations, leading to the adoption of a zero styling approach for efficiency and consistency in design implementation. Workflow Builder adopts a zero-styling approach beginning with design tokens in Figma, followed by automation for CSS generation and implementation using CSS variables, ensuring easy styling changes without developer intervention.
Scaling a React Application from 0 to a Brazilian Users
React Summit 2025React Summit 2025
19 min
Scaling a React Application from 0 to a Brazilian Users
Three years ago, faced tough decision job change. Chose tech co-founder role for innovative idea 'war with apply to job button' for universities. Startup validation via email engagement with decision makers, avoiding premature seeking of investment. Emphasis on tech stack adaptability, modular design, and reusability. Challenges with third-party library management, component library reorganization, and optimizing CSS loading. Focus on app quality improvement, release process enhancement for global success.
Third-Party Scripts: Surviving the Wild West of the Web
JSNation 2025JSNation 2025
10 min
Third-Party Scripts: Surviving the Wild West of the Web
Anton Zaldinov, senior software engineer, discusses challenges in third-party script development, emphasizing the importance of defensive coding, performance, debugging, and security. Strategies include adapting to privacy changes, efficient script loading, encapsulation, and thorough testing for reliability and security.
Reimagine Frontend in the Serverless Era
React Summit 2025React Summit 2025
8 min
Reimagine Frontend in the Serverless Era
Evangelia, tech founder of Fioromat Academy, discusses the impact of serverless technologies on frontends, emphasizing a shift towards lightweight, stateless backends split into smaller units and the increased importance of API gateways and serverless functions. The discussion also highlights the significance of optimistic state updates, caching strategies to reduce API calls, resilient connection handling with retries for failed HTTP calls, granular error handling at the component level, and custom fallback UI per component. Overall, the Talk emphasizes the evolving frontend architectures and the necessity of adapting to changes in data structures and technologies.
Supercharge Your Debugging With the New Features in Chrome Devtools
JSNation 2025JSNation 2025
29 min
Supercharge Your Debugging With the New Features in Chrome Devtools
Barry Pollard
Ewa Gasperowicz
2 authors
Eva and Bari introduce the complexity of web development and emphasize the evolving nature of DevTools, discussing productivity gains through new features. The talk covers performance debugging enhancements and user-friendly changes in the performance panel. Live metrics screen offers real-time insights, integrating real user data for performance comparison. Configuring DevTools for accurate user emulation and leveraging performance trace capabilities for debugging. Enhancing user experience with AI insights and visual assistance, setting up AI workspace in DevTools. Addressing data privacy concerns and AI usage control. Chrome DevTools API and Gemini model enhancements, AI features specific to Chrome, web sockets throttling, and AI agent probing in performance context.
Frontend’s Lost Decade and the Performance Inequality Gap
JSNation 2025JSNation 2025
32 min
Frontend’s Lost Decade and the Performance Inequality Gap
Top Content
Alex Russell's journey from engineering to product management, the focus on improving web experiences, and optimizing software for end-user success. Considerations include device performance, web diversity, and API constraints. Challenges of web platforms encompass hardware and network limitations, prioritizing user experience. Understanding the impact of Moore's Law on device performance and adapting browsers for efficiency. Emphasis on code optimization, user-focused development, and quality in web UI. Addressing challenges in PWA success, developer learning, and balancing frameworks with platform understanding.
The 2025 State of JavaScript Testing
JSNation 2025JSNation 2025
24 min
The 2025 State of JavaScript Testing
The talk delves into JavaScript testing challenges, company testing practices diversity, and the evolution of testing tools. It explores the transition to user-centric testing, browser-based component testing, and advancements in AI testing tools. The evolving landscape includes Playwright's features and comprehensive testing solutions. Future trends discuss network mocking, AI testing advancements, and the role of AI in JavaScript testing practices.
Validating the Web: The Evolution of Form Validation
React Summit 2025React Summit 2025
20 min
Validating the Web: The Evolution of Form Validation
Exploring the evolution of web forms from HTML2 to Web 3.0 and the crucial role of form validation in application development. The importance of form validation, challenges, and the need for better approaches. Introducing VEST as a flexible validation tool inspired by unit testing frameworks. Highlighting VEST's logic separation, asynchronous validation, and advanced features like caching. Discussing warning states, user guidance, and the impact of form validation on user experience and application success.
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Trending today
React Compiler Internals
React Summit 2025React Summit 2025
23 min
React Compiler Internals
Introduction to React Compiler, its benefits, and the problem of memoization in React. Performance issues due to stateful components in React, solution with React.memo and use memo, and the benefits of React compiler in automating memoization. Compiler's transformation into high-level intermediate representation provides a clearer understanding of code operations and data flow, addressing the issues with unique identifiers for variables in complex scenarios. Compiler ensures each variable is assigned exactly once through single static assignment, resolving issues with variable values based on code paths and introducing unique names for assignments. Effects describe how operations interact with data, ensuring safe caching with types like read, store, capture, mutate, and freeze effects. The compiler understands operations but needs to identify values that change between renders for React, leading to the reactive analysis phase to determine reactive values in the component. Variables marked as reactive for potential changes between renders are optimized for caching. Compiler identifies dependencies to group operations for efficient caching. Scopes are established to cache related variables together and ensure efficient rendering and performance improvement in the final JavaScript code. Compiler sets up cache slots for dependencies and outputs to optimize performance. Scopes work independently to recalculate based on changes, ensuring efficient memoization. React Compiler streamlines memoization, providing automatic correct optimizations without manual burden, paving the way for performance-focused code.
Panel Discussion: The State of React
React Summit 2025React Summit 2025
35 min
Panel Discussion: The State of React
Tanner Linsley
Naman Goel
Evan Bacon
Shruti Kapoor
Mark Erikson
Jarred Sumner
Sacha Greif
7 authors
Panelists introduced themselves and discussed React Server Components (RSCs), exploring usage in production and alternative frameworks. Challenges of adopting RSCs and benefits of universal data fetching were highlighted. The complexities of implementing RSCs were discussed, emphasizing the need for better integration. The potential of server components for composability and evolving architecture was explored. The React compiler's impact on performance optimization and component re-rendering was examined. Discussions included enhancing React with compiler features, evolving feature sets, and reimagining state management. Improvements in communication, community engagement, and dependency management within the React ecosystem were emphasized. Recommendations for managing dependencies, component performance, and audience appreciation were shared.
Maximize Productivity with AI Agents
React Summit 2025React Summit 2025
30 min
Maximize Productivity with AI Agents
Tejas discusses AI agents and productivity at the React Summit, emphasizing the role of AI in enhancing user experiences. The use of JSON data and system prompts to improve parsing and streaming processes is highlighted. The importance of AI agents in web navigation for increased productivity and efficient website interaction is explored. Development of tools like the Google Calendar Manager Agent for better calendar management and troubleshooting calendar event creation are discussed. The talk also delves into future possibilities in UX and technology, along with insights on AI component creation and comparison between Langflow and N8n.
Senior Isn't About Your Tech Skills
React Summit 2025React Summit 2025
15 min
Senior Isn't About Your Tech Skills
Being senior isn't just about tech skills; continuous improvement and broadening impact are vital for growth in the tech industry. Being effective in your work means focusing on outcomes that create superpowers for others, increasing your career opportunities and impact. Delivering valuable work creates opportunities for growth and rewards in your career. Being a senior engineer evolves from task execution to leadership and team management, leading to significant career growth and financial rewards. Results on your resume matter for your next job. Leadership, not titles, defines a senior engineer's role. Senior engineers lead projects, create direction in chaos, and focus on delivering results efficiently and effectively.
Tanstack Start - A Client-Side First Full-Stack React Framework
React Summit US 2024React Summit US 2024
30 min
Tanstack Start - A Client-Side First Full-Stack React Framework
Top Content
We surveyed thousands of developers to show that a louder audience leads to a better presentation. There has been a shift in web app development towards server-first architectures, which has improved full-stack capabilities but at the cost of complexity and divergence from the client-centric approach. Tanstec Start is a meta-framework that aims to provide the best client-side authoring experience with powerful server-side primitives. The Tansec Router supports advanced routing features, URL state management, and JSON storage. Combined with the server-side rendering capabilities of TanStack Start, it becomes even more powerful. The TanStack Router has isomorphic loaders and integrates seamlessly with TanStack Query for additional features like polling and offline support. UseSuspenseQuery allows for dynamic streaming of data during SSR. TanStack Start also offers server-side features, API routes, server functions, and middleware. The future plans include RSCs, websockets, real-time primitives, and static pre-rendering. TanStack Start is now in beta and is suitable for building React apps. It is open source.
How to React Compiler
React Summit 2025React Summit 2025
20 min
How to React Compiler
Introduction to React compiler, differences from React 19, installation of Babel plug-in React compiler, specifying target React versions, and how React compiler detects and processes component dependencies. Configuring React compiler settings, exploring default options and configurations, utilizing React compiler playground website for configurations, dealing with JSX markup re-computation. React compiler feature for extracting JSX from array map callbacks, limitations of enable function outlining, enabling JSX outlining for separate functions. Function memoization in React compiler, React compiler beta stage, potential errors with React compiler. React compiler error: memorization preservation, hidden messages, validation settings. React compiler: validation tools, hooks treatment, memorization challenges. Changing hooks to functions for React compiler optimization. React Compiler usage considerations and potential optimizations.
Prioritizing Architecture Over Framework in Web Development
React Summit 2025React Summit 2025
17 min
Prioritizing Architecture Over Framework in Web Development
Alexandre Rivet emphasizes prioritizing architecture over frameworks in web development for efficiency and project maintenance. Leveraging long-term memory improves code comprehension and speed. Effective React applications require clear component naming and caution with global state usage. Strategies for efficient React development include separate logic for DOM and smart components, reducing global state dependencies, and creating independent API clients for flexibility.
Thinking Like an Architect
React Summit 2025React Summit 2025
32 min
Thinking Like an Architect
Top ContentPremium
Modern software development shift towards developers involves more complex architecture decisions with trade-offs and long-term consequences. 11 tips learned from diverse projects and roles. Focus on decentralization, avoid technology-first approach, and consider context for great architecture. Understanding the holistic approach to architecture. Linking architecture to culture and structure. Importance of aligning decisions with business needs using techniques like event storming and domain storytelling. Netflix's core domain focuses on content accessibility and tailored user experience. Supporting domains like personalization ensure usability even during downtime. Payment methods, a generic domain, are essential for subscription. Adapting boundaries and architectural characteristics is crucial for evolving businesses. Define evolving core domains and adapt characteristics accordingly. Select key architectural characteristics for system design. Consider different availability needs for various subdomains like core and generic. Latency varies based on functions; strict for finance, flexible for integration. Understand and apply specific characteristics to subdomains for optimal system performance. Understand the need for different approaches in system design. Consider availability requirements for active architecture. Evaluate decisions impacting software design and technology. Modularize workload at code or code-infrastructure level. Consider context in choosing between monoliths and microservices. Adapt system modularity based on context and team structure. Consider modularity based on system requirements. Be pragmatic in architectural decisions. Utilize event-driven architecture in distributed systems. Leverage infrastructure for efficient service stitching and delivery. Adapt to changing system characteristics for scalability and efficiency. Consider cost implications of shifting from event-based to cron job. Design software for evolution, embracing changes and tradeoffs for user-focused systems. Create a sociotechnical system balancing long-term vision and immediate needs with a lean mindset. Embrace an iterative approach to software development, understanding the domain, consumers, and the system. Master communication skills for architects by focusing on communication, inclusion, and documentation. Translate technology reasons into business benefits to effectively communicate with various stakeholders. Change language to match audience, share reasoning effectively. Involve others in decision-making for better understanding and solutions. Master architectural decision records and architecture as code. Utilize written communication for API changes, involve all voices. Sequence diagrams aid team understanding; master architecture as code. Focus on key aspects, prioritize effectively to avoid distractions.
Build Your Web Framework From Scratch!
JSNation 2025JSNation 2025
18 min
Build Your Web Framework From Scratch!
Excited to talk at JS Nation about building web frameworks from scratch, covering framework basics and providing an example without a framework. Framework essentials include handling browser views, routing, parameters, response types, errors, and security. Discussing the components a framework needs such as routing, parameters, response types, error handling, authentication, and security. Exploring request handling in a framework with customization of headers, status, and using static methods like response.json. Detailed insights into routing, response customization, and efficient implementation for multiple responses based on paths and methods. Implementation of routing syntax, data retrieval from requests, context handling, middleware integration, and helper functions for response manipulation in a framework.
Frontend’s Lost Decade and the Performance Inequality Gap
JSNation 2025JSNation 2025
32 min
Frontend’s Lost Decade and the Performance Inequality Gap
Top Content
Alex Russell's journey from engineering to product management, the focus on improving web experiences, and optimizing software for end-user success. Considerations include device performance, web diversity, and API constraints. Challenges of web platforms encompass hardware and network limitations, prioritizing user experience. Understanding the impact of Moore's Law on device performance and adapting browsers for efficiency. Emphasis on code optimization, user-focused development, and quality in web UI. Addressing challenges in PWA success, developer learning, and balancing frameworks with platform understanding.
Short takes
What’s With Micro Frontends
JSNation US 2024JSNation US 2024
7 min
What’s With Micro Frontends
Watch video: What’s With Micro Frontends
Micro-frontends break down a large frontend into smaller, independently deployable pieces. This approach improves scalability, team autonomy, and code maintenance. Two primary ways to implement micro-frontends are build time and run time. Module federation, introduced in Webpack 5, allows for dynamic real-time updates across teams. Challenges in implementing micro-frontends include getting type safety with TypeScript and testing at runtime. Module federation 2.0 introduced type extraction and manifest updates. Full site federation allows testing the whole app. Micro frontends involve trade-offs, so choose what benefits you the most.
Server Components Wars: PHP Strikes Back
React Summit 2025React Summit 2025
6 min
Server Components Wars: PHP Strikes Back
Edoardo, a senior dev rel at Storyblok, delves into server components' intricacies, urging a better understanding. The evolution from PHP to React marked a shift in web development paradigms, emphasizing server-side rendering and dynamic client interactions. Facebook transitioned from PHP to React, introducing XHP subset. Isomorphic JavaScript and server-side rendering emerged with data requests and content rendering. React server components enable server-side rendering with data fetched from DBMS or CMS, emphasizing patterns for seamless transitions to new frameworks.
React for Good: Creating Inclusive, Secure, and Scalable Applications in Emerging Markets
React Summit 2025React Summit 2025
5 min
React for Good: Creating Inclusive, Secure, and Scalable Applications in Emerging Markets
Inosency Andembera, React developer, discusses using React for building scalable, secure, and inclusive applications for emerging markets like Malawi and Africa. Addressing challenges of Internet connectivity, device limitations, security concerns, and inclusivity for first-time Internet users. Utilizing React for performance, security, and inclusion in emerging markets through code splitting, lazy loading, authentication, input validation, multiple language support, and simple UIs. Highlighting React's features in enhancing inclusion by addressing challenges in emerging markets, such as limited digital literacy, creating simple UIs, supporting multiple languages, internationalization, step-by-step UIs, and semantic HTML for accessibility. Zunga, a financial platform in Malawi, showcases React's benefits in addressing financial service gaps, scalability, offline support, and security enhancements.
Building React Primitives to Power In-App Messaging
React Summit US 2024React Summit US 2024
8 min
Building React Primitives to Power In-App Messaging
Watch video: Building React Primitives to Power In-App Messaging
Hi, everyone. I'm Chris, the CTO at Nock. We help product teams power user-centric cross-channel notification experiences. Today, I'll talk about extending the abilities of our in-app messaging and how you can power any kind of in-app messaging using our platform. We optimize for flexibility, customization, and a shallow learning curve. Our pre-built React components include a banner, modal, card, and notification feed. All of this comes out-of-the-box, supporting light mode and dark mode. Easily show modals and announcements with no additional code. Own the rendered components for performance and customization. Build custom components with minimal code. Use hooks for fetching data and real-time updates. Noc provides a schema for strong data integrity.
Aligning Patterns Across Design and Development
React Summit US 2024React Summit US 2024
8 min
Aligning Patterns Across Design and Development
I'm Jake, a developer advocate at Figma, and today I'll be discussing aligning patterns between design and development. Collaboration between designers and developers requires recognizing our different perspectives. The goal is to close the gap between design and development, but this is often aspirational. The optimal path between design and development is somewhere in between, depending on factors like friction or waves. By recognizing each other's areas of resistance, we can find ways to make collaboration more effective. Figma's Code Connect fills the gap between Figma component logic and code logic by allowing teams to publish code-based informed component code snippets. CodeConnect currently supports HTML, Web Components, Angular, Vue, React, SwiftUI, and Jetpack Compose, and seeks to support more languages.
Divide and Conquer? - Exploring the 'JS0' and 'JSSugar' Proposal for JavaScript Evolution
JSNation 2025JSNation 2025
5 min
Divide and Conquer? - Exploring the 'JS0' and 'JSSugar' Proposal for JavaScript Evolution
JS 0 and JS Sugar proposal for JavaScript evolution. Complexity abstraction to engines. Splitting language into JS0 and JSugar. Lessons learned from developers' concerns and users' preferences. Involvement in shaping JavaScript ecosystem.
Delivering High-Quality Videos on Your ReactJS Website
React Summit 2025React Summit 2025
7 min
Delivering High-Quality Videos on Your ReactJS Website
Raul from ImageKit discusses optimizing and streaming videos, highlighting challenges like resolutions and codecs. Developers can use ImageKit Video API for seamless integration and quick optimization. ImageKit offers streamlined video hosting with real-time optimization and adaptive streaming. It enables easy access to cloud storage and transformation of videos for better user experience.
Next.js Adapters: Build Once, Deploy Everywhere
React Summit 2025React Summit 2025
7 min
Next.js Adapters: Build Once, Deploy Everywhere
Hello, React Summit. Excited to talk about Next.js adapters. Evolution towards adapter solutions to simplify deployment complexities. Minimalist adapter interface for customization and structured output handling. Key hooks and configurations for platform-specific optimizations. Partners collaboration for enhanced experiences in Next.js deployments. Simplified, platform-agnostic deployments for better developer experience.
A JS Dev's Guide to Not Dismissing Blockchain
JSNation 2025JSNation 2025
6 min
A JS Dev's Guide to Not Dismissing Blockchain
Thanking Git Nation and Algorand team. Exploring blockchain's journey to enlightenment. Algorand's role in blockchain solutions like disintermediation, data integrity, and market access. Highlighting businesses on Algorand mainnet like TravelX, Lofty, and LabTrace. Algorand TypeScript simplifies blockchain development with real TypeScript, avoiding complex assembly language. Examples like asset transfers and key-value storage demonstrate accessibility.
WinterTC and How Standards Help Developers
Node Congress 2025Node Congress 2025
5 min
WinterTC and How Standards Help Developers
WinterTC is working on standardizing JS runtimes to avoid vendor lock-in and provide a universal API. This involves defining which web APIs should be included, such as URL and WebAssembly. The goal is to create a definitive list of APIs for server-side JS runtimes.
Popular
JavaScript
10 Years of Best of JS
JSNation 2025JSNation 2025
28 min
10 Years of Best of JS
Michael discusses the evolution of JavaScript from its early days to modern server-side capabilities, the impact of jQuery, Node.js, and single-page applications with popular libraries like Backbone and AngularJS. The emergence of UI libraries like React, Vue.js, and Angular, alongside meta frameworks like Next.js, Remix, Veltkit, and Solid with server components. The Best of JS project tracks JavaScript project trends, filters out deprecated projects, and monitors GitHub stars for maintenance. The importance of maintaining project relevance, adding new projects continuously, and classifying projects under meaningful tags. The evolution of TypeScript, tool releases like Deno and Burn, styling evolution from CSS to headless components, and the impact of Tailwind CSS. Analysis of CSS optimization, CLI ecosystem, tooling trends, emerging tools, and JavaScript development trends over the past decade.
Temporal: The Curious Incident of the Wrong Nighttime
JSNation 2025JSNation 2025
25 min
Temporal: The Curious Incident of the Wrong Nighttime
Speaker's involvement in Temporal proposal and TC39 meetings for JavaScript standardization. Date conversion challenges faced in development. Addressing time zone discrepancies with Temporal to prevent bugs. Exploration of Temporal types and design philosophy. Usage of Java's time zone serialization in JavaScript Temporal. Challenges in implementing Temporal proposal and its transformative potential in ECMAScript.
Temporal: Modern Dates and Times in JavaScript
JSNation US 2024JSNation US 2024
22 min
Temporal: Modern Dates and Times in JavaScript
I'll speak today about the Temporal proposal, which adds modern date and time handling to JavaScript. Temporal is an API that'll be available in browsers soon and will add a built-in library for dates and times, avoiding the need for external libraries like Moment. It offers strong typing with different types for different data, such as calendar dates with or without time. Temporal objects are immutable and designed to work with JavaScript's internationalization facilities. It addresses deficiencies in the global Date object and introduces types like instant and plain types for accurate representation of time and dates across time zones. With the old Date, representing a date without a time can be problematic, especially in time zones where midnight is skipped due to daylight saving time. Temporal introduces types like PlainDate, PlainTime, PlainYearMonth, PlainMonthDay, and ZonedDateTime to accurately represent different scenarios. Additionally, there is a type called Duration for arithmetic operations and unit conversion. Now that I've introduced you to the cast of characters in Temporal, it's time to show how to accomplish a programming task. We'll start with an easy task: getting the current time as a timestamp in milliseconds using the instant type. To convert between Temporal types, you can either drop or add information. The toZonedDateTime method is used for conversion and requires adding a time zone and a time. Although Temporal objects are immutable, you can create new objects with replaced components using the with method. Migrating from the old Date object to Temporal offers a more reliable solution and avoids potential bugs. Check out the documentation for more details and enjoy using Temporal in your codebase!
React
Scaling React Performance: From Basic to Advanced Code-Splitting Techniques
React Advanced 2024React Advanced 2024
12 min
Scaling React Performance: From Basic to Advanced Code-Splitting Techniques
I'm Gil, a performance architect at Wix. Today, I'll explain how we use code splitting to improve website performance. Code splitting breaks down JavaScript into smaller chunks or React components, loading them only when needed. This reduces JavaScript size and improves user experience. We measure performance using Core Web Vitals, focusing on INP scores, which evaluate interactivity. Reducing JavaScript improves INP. Our INP scores have significantly improved, thanks to our code splitting techniques. Let's dive into the code splitting strategies we use, starting with dynamic import and React Lazy. Let's move on to a more advanced example: conditionally loading components on page load, not on user interactions. We fetch the comments data and render the comment section only if there are any comments. This method is supported in React 18 and works for server-side rendering (SSR). React components can be loaded dynamically on scroll or hover interactions with suspense. If the components are already rendered with SSR, we just need to download and hydrate them. This is only possible with the new suspense in server-side rendering (SSR). We use react-lazy with dynamic imports to render the component when it enters the viewport. I created a download on viewport wrapper that creates a ref and uses the intersection observer to resolve a promise when the component enters the viewport. I use the viewport and a wrapper that calls a function called use, which is implemented using the suspense API from React. This function is used to manage the promise and render the components only after it's resolved. The suspense component handles this promise. We moved props calculation to the server side and fetched them in the React component. This approach simplifies the process and can be implemented using the dynamic API in Next.js. By conditionally rendering components and calculating props on the server side, we can significantly reduce the amount of JavaScript code loaded in the client side, resulting in improved performance.
If You Were a React Compiler
React Summit US 2024React Summit US 2024
26 min
If You Were a React Compiler
Top Content
In this talk, the speaker aims to build an accurate understanding of how the new React compiler works, focusing on minimizing re-renders and improving performance. They discuss the concept of memoization and how it can be used to optimize React applications by storing the results of function calls. The React compiler automates this process by analyzing code, checking dependencies, and transpiling JSX. The speaker emphasizes the importance of being aware of memory concerns when using memoization and explains how the React compiler detects changes in function closure values. They also mention the Fibre Tree, which drives the reconciliation process and helps optimize performance in React. Additionally, the speaker touches on JSX transpilation, compiler caching, and the generation of code. They encourage developers to understand the code generated by the compiler to optimize specific sections as needed.
How to React Compiler
React Summit 2025React Summit 2025
20 min
How to React Compiler
Introduction to React compiler, differences from React 19, installation of Babel plug-in React compiler, specifying target React versions, and how React compiler detects and processes component dependencies. Configuring React compiler settings, exploring default options and configurations, utilizing React compiler playground website for configurations, dealing with JSX markup re-computation. React compiler feature for extracting JSX from array map callbacks, limitations of enable function outlining, enabling JSX outlining for separate functions. Function memoization in React compiler, React compiler beta stage, potential errors with React compiler. React compiler error: memorization preservation, hidden messages, validation settings. React compiler: validation tools, hooks treatment, memorization challenges. Changing hooks to functions for React compiler optimization. React Compiler usage considerations and potential optimizations.
The State of React and the Community in 2025
React Summit 2025React Summit 2025
29 min
The State of React and the Community in 2025
Mark Erickson discusses the state of React in 2025, React community debates on React's direction and misconceptions, React's shift towards client-side frameworks and SSR emphasis, React's feature development process at Meta and Vercel, controversy around Vercel's server components involvement, tight relationship between React and Next, React team's emphasis on frameworks for app performance, critique of React's heavy-handed framework recommendation, React team's delay in adding VEET as a recommended tool, challenges with server components' origins and communication, no official signals support planned for React 19, social media impact on React development decisions, React community diversity and server components usage insights, React's evolving black box concept and tradeoffs discussed.
Evaluating React Application Performance with a Sip of RUM
React Day Berlin 2024React Day Berlin 2024
10 min
Evaluating React Application Performance with a Sip of RUM
Hello, everybody. How are we all doing? I'm going to talk about Rome, OpenTelemetry, and identifying performance bottlenecks and issues in React applications. The pillars of observability are logs and metrics. Logs are structured messages that warn, indicate, or error. Metrics include throughput, latency, custom and core web vitals. Traces allow us to see through the pathway of our application and identify bottlenecks. One common open standard for collecting these signals is open telemetry. React's client instrumentation is experimental and mostly unspecified. The open telemetry demo provides an example of front-end tracing in React, giving you a unique service name and basic metrics. The demo shows an HTTP POST request with the pathway and timing. The open telemetry project is still working on core web vital metrics and other enhancements. Real user monitoring (RUM) fills the gaps in open telemetry, capturing missing information. In conclusion, we discussed the importance of capturing logs, metrics, and traces and provided resources for further exploration.
Panel Discussion: The State of React
React Summit 2025React Summit 2025
35 min
Panel Discussion: The State of React
Tanner Linsley
Naman Goel
Evan Bacon
Shruti Kapoor
Mark Erikson
Jarred Sumner
Sacha Greif
7 authors
Panelists introduced themselves and discussed React Server Components (RSCs), exploring usage in production and alternative frameworks. Challenges of adopting RSCs and benefits of universal data fetching were highlighted. The complexities of implementing RSCs were discussed, emphasizing the need for better integration. The potential of server components for composability and evolving architecture was explored. The React compiler's impact on performance optimization and component re-rendering was examined. Discussions included enhancing React with compiler features, evolving feature sets, and reimagining state management. Improvements in communication, community engagement, and dependency management within the React ecosystem were emphasized. Recommendations for managing dependencies, component performance, and audience appreciation were shared.
Tanstack Start - A Client-Side First Full-Stack React Framework
React Summit US 2024React Summit US 2024
30 min
Tanstack Start - A Client-Side First Full-Stack React Framework
Top Content
We surveyed thousands of developers to show that a louder audience leads to a better presentation. There has been a shift in web app development towards server-first architectures, which has improved full-stack capabilities but at the cost of complexity and divergence from the client-centric approach. Tanstec Start is a meta-framework that aims to provide the best client-side authoring experience with powerful server-side primitives. The Tansec Router supports advanced routing features, URL state management, and JSON storage. Combined with the server-side rendering capabilities of TanStack Start, it becomes even more powerful. The TanStack Router has isomorphic loaders and integrates seamlessly with TanStack Query for additional features like polling and offline support. UseSuspenseQuery allows for dynamic streaming of data during SSR. TanStack Start also offers server-side features, API routes, server functions, and middleware. The future plans include RSCs, websockets, real-time primitives, and static pre-rendering. TanStack Start is now in beta and is suitable for building React apps. It is open source.
Is React Really Dying?
React Advanced 2024React Advanced 2024
29 min
Is React Really Dying?
Is React really dying? React is dead. Let's take a look at the numbers. Svelte is getting 1.5 million downloads per week. Angular is pulling 3.5. Probably not a competitor with React. React dwarfs everything with 25 million downloads a week. React is incredibly popular with 4 million users and developers. Despite some criticism, a survey shows that 71% of respondents liked React, while only 28% didn't. React's flexibility and options can be overwhelming for beginners. React's complexity has increased, causing confusion for beginners. Memory management, overcomplicated architecture, and innovation fatigue are common challenges in React. React 19 is delayed due to suspense issues. React server components are a favorite innovation. Qwik's hydration model is cool. Qwik is amazing, and it would be cool to see something like it for React. AI can help you get 80% there, but you still need an actual developer to tweak and clean up the code. Tab AI keeps your workflow going. React's popularity is undeniable. The momentum behind React is strong, and it's unlikely to fade away anytime soon.
Everything You Thought You Knew About React Functional Components Is Wrong
React Summit US 2024React Summit US 2024
22 min
Everything You Thought You Knew About React Functional Components Is Wrong
Thank you for coming to React Summit! I wanted to create clarity around React Hooks and provide tools for troubleshooting React issues. Functional components in React are different from class components in terms of their lifecycle. Understanding the creation and destruction of objects in JavaScript is crucial to comprehend the behavior of functional components. Creating functions and objects that are not used can lead to memory waste and system resource consumption. Storing references to variables can keep them in memory, so it's crucial to ensure there is a direct path from window to the variable. This talk discusses creating objects and storing them in React components using useState and useMemo. It emphasizes the importance of using useCallback in cases where a callback is going into a component with a large state tree to avoid unnecessary renders. The talk also explores different approaches to handling data retrieval and update in React components, highlighting the use of useRef as a solution to access and update data in server-side data sources. Overall, the talk provides insights and tools for troubleshooting issues in React functional components.
Our Own React Global State Manager in Less Than 50 Lines of Code
React Summit 2025React Summit 2025
26 min
Our Own React Global State Manager in Less Than 50 Lines of Code
Speaker delves into global state management in React, mentioning Redux and alternatives like React context. Creating a global state manager in under 50 lines of code with React context, highlighting challenges with performance and React specificity. Building a custom hook named user store for state management, implementing state and API for store, handling partial state updates efficiently. Managing listeners for state changes, setting up custom hooks and selectors, and subscribing to external stores. Demonstrating optimization in state management and preventing unnecessary button re-renders. Discussion on Redux, Signals, debugging, and various global state management choices like Zestand and Redux toolkit.
Node.js
NodeJS & AI: Building Smarter Applications
Node Congress 2025Node Congress 2025
19 min
NodeJS & AI: Building Smarter Applications
Today's Talk explored combining Node.js and artificial intelligence to build smart applications. Two types of models, closed and open source, were discussed, with closed models accessed via an API and open source models hosted locally or on the cloud. The use of RAC (Retrieve of Method Generation) to enhance models was explained, along with the process of obtaining data and improving retrieval performance. Chunking, embedding, and vector databases were introduced as techniques for organizing and transforming data. The Talk also covered data retrieval using semantic search and the generation of human-readable answers using models. The concept of enhancing models with agents was discussed, focusing on how agents break down complex goals and utilize external functions. The use of tools and the React pattern in implementing agents was highlighted. Lastly, the Talk touched on implementing agent patterns and enhancing LLMs, with demos and code available for further exploration.
What's in a Node.js Bug – A Case Study
Node Congress 2025Node Congress 2025
23 min
What's in a Node.js Bug – A Case Study
I'm going to talk about character encodings, specifically a Node.js bug related to UTF-8. Two popular encodings are UTF8 and UTF16. The bug was discovered in August 2024 and was traced to a specific pull request in the Node.js core repository. The bug is caused by an incorrect implementation of the fast write string method. Lessons learned include the importance of naming conventions and thorough testing beyond coverage analysis.
Run TypeScript Natively in Node.js
JSNation 2025JSNation 2025
28 min
Run TypeScript Natively in Node.js
Discussion on TypeScript adoption in Node.js, typescript's popularity, challenges in integrating TypeScript with Node.js due to versioning differences, introducing strip types to remove non-JavaScript syntax, leveraging the SWC library through Amaro for efficient code execution, Node.js support for TypeScript with experimental strip types, enabling transform types and source maps by default, TypeScript evolution with new flags for type checking, TypeScript ESM code evaluation in Node, issues with TypeScript and JavaScript syntax ambiguity, collaboration between Node.js and TypeScript teams, recommendations on using TypeStripping for production projects, comparison of performance between TS Node and Node for TypeScripting, handling type definitions and runtime checking in TypeScript using Zod.
The Alleged ‘End’ of Node.js Is Much Ado About Nothing
Node Congress 2025Node Congress 2025
26 min
The Alleged ‘End’ of Node.js Is Much Ado About Nothing
Hello, welcome to Node Congress 2025. Node is not dead and will remain popular for a long time. Node has a large number of downloads across different platforms. Despite known vulnerabilities, older versions of Node are still widely used. Node.js is an active and thriving project with a strong focus on security. Recent updates have introduced new features and improvements, including ESM support, stable threads, and web platform compatibility. Node is governed by the OpenJS Foundation and maintained by collaborators. Consensus-seeking is important for the project's development. Start contributing and be part of the future of Node.js.
Running Java in Node.js with WebAssembly
Node Congress 2025Node Congress 2025
19 min
Running Java in Node.js with WebAssembly
Hello, everyone. Welcome to my talk on running Java in Node.js with WebAssembly. Many organisations have a lot of Java code, and as they adopt newer technologies such as Node.js or CloudFloat workers, maintaining interoperability with this existing code becomes important. WebAssembly is a stack machine-based thing, like the JVM, but with a different instruction set. It improves over Asm.js with a new binary format and supports streaming compilation, SIMD, and 64-bit integers. Compiling Java code to WebAssembly involves converting JVM instructions, handling local slots, recovering if statements, and understanding control flow. Short circuit conditionals and loops are important to consider in the conversion process. Additionally, memory allocation, object creation, and program memory are key concepts. Overall, this talk explores the challenges and techniques involved in running Java in Node.js with WebAssembly.
What We All Pretend to Know: The Differences Between the JS Engine & JS Runtime
JSNation 2025JSNation 2025
11 min
What We All Pretend to Know: The Differences Between the JS Engine & JS Runtime
Karina Ionkina
Samiul Huque
2 authors
The talk delves into the intricacies of JavaScript engine and runtime, emphasizing the importance of understanding execution processes for effective development and debugging. It discusses how JavaScript engines optimize code through parsing, abstract syntax trees, and byte code execution. Strategies for optimizing code include maintaining type stability, using type-stable arrays, and consistent object shapes to avoid deoptimization. Recommendations for enhancing JavaScript execution involve ensuring input type consistency, using type-stable arrays, and understanding the event loop's role in code execution across different runtimes and engines.
Speeding Up Your Node Sever With Rust
JSNation 2025JSNation 2025
21 min
Speeding Up Your Node Sever With Rust
Talk on improving Node server efficiency with Rust. Node's ease of use but inefficiency for some tasks. Example of a slow express server handling high scores inefficiently. Native modules in Rust provide a safer alternative to C for improving efficiency. Rust empowers developers to build reliable and efficient software, with strong static typing and immutability by default. Rust's result and option enums handle error and value absence cases. The ownership system in Rust ensures safe memory management without manual intervention. The importance of ownership in Rust for memory management and error prevention. Writing native modules in Rust with NAPI for easier project creation and code integration. Exploring the efficiency gains of using Rust's native modules for faster performance and reduced risks in development.
Make Hono work on Node.js
Node Congress 2025Node Congress 2025
15 min
Make Hono work on Node.js
Today's Talk is about making Hono work on Node.js. Hono is a backend for web frameworks that supports TypeScript. It started as a Cloudflare workers framework and now supports multiple runtimes. The Node.js adapter allows Hono applications to run in Node.js by converting Node.js APIs into web standard APIs. Benchmark tests show that Hono is faster than Express but slower in some core areas. The Node.js adapter has been widely used and has undergone performance improvements. Overall, adding Node.js support to Hono has been successful in reaching more users and improving quality.
The Path to Native TypeScript
Node Congress 2025Node Congress 2025
24 min
The Path to Native TypeScript
Today's Talk discusses the integration of TypeScript in Node.js. The path to native TypeScript in Node.js is explored, including the history of user requests for native support. Implementing TypeScript in Node.js poses challenges due to differences in stability guarantees and tool compatibility. TypeStripping is a transpilation-focused implementation that removes non-JavaScript features, making it stable across TypeScript versions. The Amaro package, built on SWC, provides compatibility and speed for type stripping. Experimental Strip Types and Transform Types flags enable erasable TypeScript features. TypeScript has limitations such as namespace and enum support in JavaScript and code migration issues. TypeScript Import Types and Syntax Detection are ongoing developments. Ambiguity in syntax between JavaScript and TypeScript is addressed with an erasable syntax only flag. Future steps include bug fixing, performance improvements, and upcoming Node.js releases.
Testing
Maestro & Expo: Crafting the Future of Efficient e2e Testing
React Advanced 2024React Advanced 2024
20 min
Maestro & Expo: Crafting the Future of Efficient e2e Testing
End-to-end testing is important for catching hard-to-find bugs, but it can be complex and time-consuming. The speaker shares their journey at YOLO apps and how they addressed these issues using Maestro, a newer testing tool. Maestro allows interaction with all aspects of the app and offers a web interface for building tests. It also provides features like auto retry and test videos for troubleshooting. The speaker also discusses automating CI/CD using Expo and EAS, which simplified the app build and distribution process. They demonstrate how EAS and MySQL Cloud can be used for reporting and investigation. The power of end-to-end testing is showcased, with a fast CI/CD time and free tests and EAS updates. Maestro has some limitations, but it offers easy test writing and 100 free tests per month, with additional tests available at a cost.
AI-Powered E2E UI Testing: Faster Creation, Easier Maintenance
JSNation US 2024JSNation US 2024
10 min
AI-Powered E2E UI Testing: Faster Creation, Easier Maintenance
Hello, everyone. Today we are going to explore AI-powered end-to-end testing. Unlike unit tests, UI testing has a huge layer of obstructions between the source code and the rendered UI. The source code includes HTML, CSS, and TypeScript, which are transpiled into JavaScript and bundled with tools like Webpack. AI can generate tests effectively for standard websites or blogs, but it may struggle with niche applications behind strict authorization or on-premise tools. AI-powered end-to-end testing for complex scenarios requires our guidance. We use meaningful data test IDs and follow the page objects model pattern. Additionally, we rely on useful tools like the end-to-end test helper in-browser extension and the continue IDE extension. Now, let's proceed to the demo, where we will create tests for the Pokemon application, including the ability to filter by name or type. We will navigate to the Pokemon details page and use our extension to manage settings and prompts. Additionally, we will create the details page object together and generate the test file. The Pokemon details page has 105 elements. We can view the elements for debugging purposes, including page object name, Pokemon details page, and system message. We will copy the page object and save it to a file. We need to make it exportable. Then, we will use the extension to create an end-to-end test and pass the context. I will use all the open files, including the page objects and the test case itself. I will send them to EI along with the predefined prompt. There is a system message and additional information we need to be aware of. The test runs successfully, and that concludes this part.
Accessibility Granted: Building Inclusive Components One Test at a Time
React Summit US 2024React Summit US 2024
18 min
Accessibility Granted: Building Inclusive Components One Test at a Time
Watch video: Accessibility Granted: Building Inclusive Components One Test at a Time
At Evinced, the mission is to make the web more accessible for everyone. Accessibility issues are common despite intentions. Today's Talk focuses on coding in an accessible way using TDD to catch defects early. Unit tests can be written to ensure accessibility requirements are met. Testing Library provides utilities for testing accessibility. The ATDD approach allows continuous creation of tests for compliance. Unit testing is valuable for complex components. Advanced has developed an SDK called the Unit Tester for automating accessibility tests.
Inside the Engine: How Modern JS Test Runners Work and the Traps They Hide
Node Congress 2025Node Congress 2025
22 min
Inside the Engine: How Modern JS Test Runners Work and the Traps They Hide
Hello, I'm grateful that you chose to watch my talk. Thank you. Last week, I had to run some unit tests while I was coding. Business performance can be awesome. It has very interesting and outstanding features. These test sets are overly complex. It's easy to find yourself troubleshooting for hours. VTest has almost 200 configuration options. By explaining how things work, we can answer questions about using complex third-party runners versus the built-in node.js runner. Understanding better helps avoid pitfalls, troubleshoot faster, and identify opportunities for configuring things better. The CLI layer does validation and hands over to the VTest class. It searches for test files, runs them efficiently using a pool of workers, and ensures isolation to prevent issues with dirty state. VTest uses the piscina library to facilitate work with multiple workers and improve performance. The workers prepare by setting the right globals, initializing snapshots, deciding the test runner file, and starting coverage collection. Each worker executes all the tests in a file and sends an RPC message when done. The decision to reuse or create a fresh worker is determined by the isolate configuration option. Consider spreading tests among more files to fully utilize the machine. Choose between process, thread, or VM as the worker type. In terms of isolation, you can choose between using a process, a thread, or a VM. Process is the heaviest in terms of performance cost, while thread is lighter. VM performance depends on known slower aspects like accessing globals. Process is the classic choice for stability, but thread has limitations and known issues. VM has reporting issues with memory leaks. Benchmark results showed that using multiple processes was 50% better for real-world applications, but for unit tests, one process was ten times faster. Thread was slightly faster than process, and VM was slower. The price of isolation with process worker types was approximately three minutes. Without isolation, the tests lasted only two minutes, much faster, but with a few failures. Threads showed similar results with a few failures. The risk of dealing with testing issues increases without isolation. By default, tests run sequentially inside workers, but you can configure them to run in parallel using the 'concurrent' keyword. However, tests still run sequentially despite specifying 'concurrent'. Concurrency in VTest is based on promises and requires asynchronous work. Unit tests run sequentially and concurrency has no isolation. Mocking in one test affects other tests running simultaneously. In choosing worker configurations, it depends on the context. In-file concurrency is best avoided, and the process worker type is recommended as the default. Isolation is crucial in integration tests but not mandatory in unit tests. Inside the worker, a TypeScript file is handled, and failures can occur when mocking functions. Mocking doesn't work in the worker. The worker handles TypeScript files and transpiles them using Vite server. Vite server replaces imports and hoists the mocking. Vite introduces a new module loader in the runtime. Vite hoisted the mock to the first line in the transform code to make it before the import. Additionally, Vite changes mocks to dynamic imports, ensuring that mocking works. Vite intercepts function calls on the file import level, but cannot intercept calls between functions in the same file. Moving function two to a different file or using an object export can solve this issue. Function one calls function two on the same object context. Use Spy to replace functions inside the object. Vite offers a range of plugins for different functionalities. You can fix import issues by customizing Vite's runtime. The Vite server handles dependency resolution and transformation. Consider using the built-in test runner or mockup for small-scale testing. Gain a better testing experience with Vite's customized runtime.
Testing the Waters With Deno
JSNation 2025JSNation 2025
24 min
Testing the Waters With Deno
Today's discussion delves into testing in Deno, emphasizing its simplicity and built-in tooling. Deno offers a seamless testing experience for developers, allowing tests to be written in TypeScript without extensive setup. The platform supports BDD-style testing, provides various assertion types, advanced features like code coverage and snapshot testing, and allows for filtering tests based on keywords. Additionally, Deno facilitates component testing, dependency mocking, and migration of test suites from Jest to Deno with minimal changes.
Advanced Playwright Techniques for Flawless Testing
JSNation US 2024JSNation US 2024
20 min
Advanced Playwright Techniques for Flawless Testing
Hi, everyone. My name is Debbie O'Brien, Principal Technical PM at Microsoft. I'm focusing on Playwright, a reliable end-to-end testing tool for modern web apps. It works on any browser and platform, has powerful tooling, and tests run fast. Advanced techniques include UI mode, HTML reports, and trace viewer. Use annotations in Playwright to enhance reporting and test organization. Mocking API responses and external links is possible with Playwright. You can also test date and time by setting a fixed fake time. Playwright offers CLI test options and has a vibrant community. Join the Playwright Discord server and follow the important docs and YouTube channel for more information.
At the Top of the Pyramid: Playwright Testing at Scale
React Summit 2025React Summit 2025
25 min
At the Top of the Pyramid: Playwright Testing at Scale
Introduction to Playwright as an end-to-end testing tool with easy installation and code generation. Features include visual comparisons, API testing, and best-in-class developer experience. Playwright offers AI capabilities, practical testing tools, and innovative testing strategies. Challenges in testing specialized domains are addressed, along with best practices for test dependencies and readability. Optimizing testing efficiency through parallelism, code organization, and network cache usage. The discussion also covers test performance enhancement, managing workers, optimizing dependencies, stability of test functions, and the use of Playwright sharding in CI/CD runs.
Beyond React Testing Library: Testing React Libraries (and library-like code)
React Advanced 2024React Advanced 2024
33 min
Beyond React Testing Library: Testing React Libraries (and library-like code)
Today's talk is called Beyond Testing Library, Testing React Libraries and Library-like Code. The speaker, Lenz Liebertronik, discusses the special requirements for testing libraries, including minimizing re-renders, avoiding tearing, and rendering components granularly. They highlight scenarios where React Testing Library falls short and introduce the Testing Library React render stream as a solution. The speaker demonstrates how to test hooks, multiple hooks, and assert re-renders using different techniques. They caution about potential issues with React upgrades, test-only components, ACT batching, and Suspense boundaries. The speaker shares real-world usage of the render stream library and discusses the limitations of correlating renders with DOM commits. They emphasize the importance of testing libraries and gradually optimizing code. They also mention the benefits of using the testing library and conclude with gratitude and a Dutch lesson.
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