Talks from our events
Latest
All talksShining Offline: The Mobile BelIS-Online Wuppertal ExperienceWatch video: Shining Offline: The Mobile BelIS-Online Wuppertal Experience
React Summit US 2024
17 min
Shining Offline: The Mobile BelIS-Online Wuppertal Experience
Hi, welcome to Shining Offline. I'll share how using the offline first approach saved us in the mobile urban lighting system. We'll discuss Kismet, the Bayless system, and the transition to a progressive web app. The system handled work orders, but the manual process caused unnecessary effort. In 2015, we built a native iOS app, but faced challenges with updates and communication. Eventually, we convinced the client to switch to a progressive web app. The new PWA's design improves usability and uses maps and services from the city's own infrastructure. Implementing the offline-first principle addressed many issues, and providing offline maps required using MapLibreGL app protocol. Offline communication with the iOS app endpoint and managing conflicts were also discussed. Offline-first requires significant effort but leads to user satisfaction. iPads are the devices of choice.
Plants vs Thieves: Automated Tests in the World of Web Security
React Day Berlin 2024
25 min
Plants vs Thieves: Automated Tests in the World of Web Security
Hello everyone, and I'm so happy to see you here in React Day Berlin. This talk is on security and testing, two topics I'm passionate about. It's a wonderful allegory on web security using Plants vs. Zombies as inspiration. There are reasons to focus on testing as a line of defense. Learn your application and its vulnerabilities. Tests are the messenger, listen to them. Use OWASP's top 10 ranking to understand the most important security risks, including broken access control and cryptographic failure. Injection is a major security risk. Writing proper tests and using test cases can help mitigate this issue. To test for injection vulnerabilities, write negative tests that simulate extra injections in input fields. Test content security policies using Cypress. Implementing best practices and multiple defenses can keep attackers at bay. Automation is essential for detecting security issues in your app. Write test cases, use the features of test frameworks, and consider using different types of testing.
React Server Components in AI Applications
React Day Berlin 2024
33 min
React Server Components in AI Applications
Good morning, React Day Berlin! Today we'll discuss the intersection of AI and React server components. AI engineering is like salt for React developers, enhancing product experiences. Generative UI uses AI to generate text and code, and we'll build a React app using server components with generative UI. AI can improve movie search by inferring context, and we'll build a collaborative movie search project. Implementing AI search involves creating an AI context and setting UI state. We can enhance the UI by adding a system prompt and creating an AI agent for rich UI. The generate function acts as a generator for the virtual DOM. Memory functionality and interactive movie components can enhance the UI further. The future possibilities include AI-generated UI for e-commerce and personalized recommendations. React server components and the intersection of AI and UI are essential for UI engineers. AI SDK is MIT licensed and available for further discussions.
The Performance Impact of Generated JavaScript
JSNation US 2024
17 min
The Performance Impact of Generated JavaScript
Today's Talk discussed the performance impact of generated JavaScript and the importance of bundle size in relation to page load speed and user experience. The use of a build process, minification, and avoiding unnecessary polyfills were highlighted as strategies to reduce bundle size. API design considerations, such as avoiding deeply nested object lookups and using functions and objects instead of classes, were discussed in relation to minification. The concepts of down-compilation and transpilation were explained, with a focus on the challenges and benefits they present. The Talk also emphasized the need to avoid using TypeScript enums and instead use string constants, as well as the importance of compressing code and tracking bundle size changes. Bundle analyzers were recommended for visualizing bundle contents and component connections.
How I Support Over 100 Languages in My React app...and You Can Too!
React Day Berlin 2024
28 min
How I Support Over 100 Languages in My React app...and You Can Too!
I'm Richard Kerrigan, and I'm thrilled to be here today to show you how you can add multilingual support into your React apps. The problem we're trying to solve is that most websites, web apps, only publish content in one language, which is not convenient for users and is not inclusive for people for whom that language is not their primary language. We need a way to support other languages and dialects on our websites and web apps without adversely affecting our team's productivity. Now there are various ways we could approach solving the problem, depending on the resources we have available to us. But for the sake of this talk, let's assume that we don't have much budget to dedicate to this feature, nor do we have a team that can translate content for us. This is a fantastic use case for AI and automation. When my team started tackling this problem, we found the Azure AI translator service. It offers ad hoc text translation and document translation, with key features such as language support, cost-effectiveness, and accuracy. It also allows the use of custom glossaries to tweak the translation process. However, there are some limitations, such as compatibility with certain file types and the need for result validation and possible tweaking. Let's now focus on designing the workflow for translating content stored as JSON. Here's an example of how you could achieve this. We're taking the pieces of data that need to be translated and sending each piece through the translator. Then, we send the translated content as a response. For JSON content, the translation can be done at runtime in a React server component or an API route. For HTML or Markdown files, the translation can be incorporated into the CI-CD workflow, involving Azure Blob Storage, Azure Function App, and the app's source code files. Instead, we've moved the translation process to our GitHub Actions workflow. We provision the necessary resources in Azure, build and deploy the function app, and then perform the translation process. We configure the translation endpoint, specify the glossary for tweaking translations, and execute the translation. Once the translation is complete, we create a new blob in the output location. Our GitHub workflow ensures that all translations are done before proceeding to the next step, where we upload and download the artifact for deployment. This ensures that all content is translated and avoids errors for missing files. When setting up the translation process, it felt like magic. The pipeline for translating Markdown content is the same as for HTML content. The difference lies in how the metadata is handled. In HTML, the metadata is stored in the head of the file, while in Markdown, it is within the front matter section. When translating HTML files, the head needs to be translated as part of the process. For Markdown files, the metadata needs to be translated separately due to issues with Azure AI Translator. The translation function parses and translates the original files' metadata, then combines it with the translated files' content. The GitHub actions workflow provisions Azure resources, builds and deploys the function app, and runs the translation process for both HTML and Markdown files. The process is now deploying the ARM template that includes the necessary resources. We discussed the problem of limited language support on websites and web apps, the benefits of Azure AI Translator, and alternative solutions. We also explored different versions of the app for translating JSON, HTML, and markdown content without learning a new language. If interested, you can find more information and resources on GitHub and Azure AI Translator. The workflow is now deploying and translating the markdown files. It ensures all files are translated before deployment. Once the translation is complete, the files are put back into the repository. The deployment process guarantees the presence of all necessary resources. After a brief wait, the web app is ready to be viewed. The blog contains multiple posts. The metadata provides the title and excerpt for each post. The markdown is parsed into HTML for rendering. Formatting is preserved in different languages. Feel free to connect with me on LinkedIn or X.
It’s Time to Fall in Love With CSS (Again)Watch video: It’s Time to Fall in Love With CSS (Again)
JSNation US 2024
11 min
It’s Time to Fall in Love With CSS (Again)
Hi, I'm Tony Alisea, a developer with over 25 years of experience. CSS won in the 90s due to its separation of structure and presentation, cascade concept, and powerful selectors. JavaScript developers fell out of love with CSS when they started using frameworks to construct the DOM. Instead of looking at the DOM holistically, we began to think in terms of componentization. CSS has continued to grow and add extraordinary features, such as CSS nesting and cascade layers. CSS layers give more control over the layering of CSS styles. Container queries allow us to respond to the size of the container instead of the viewport. The has pseudo class enables selecting parent elements. CSS is now more component-friendly and improves the user experience.
From Redux to Zustand to Jotai to Zustand to Custom: Our State Management Horror Story
React Day Berlin 2024
29 min
From Redux to Zustand to Jotai to Zustand to Custom: Our State Management Horror Story
Today's Talk is about Plux, a TypeScript application built with React and Three.js. The speaker discusses the challenges they faced with state management and their journey of switching libraries multiple times. They started with Redux but later introduced GSDAN, a faster and easier-to-maintain state management library. They optimized performance using selectors but realized it became a problem when dealing with documents with many nodes. They replaced Zustand with Jotite for better performance but encountered limitations and ultimately implemented a custom store, resulting in a significant improvement. The speaker emphasizes the importance of not locking into a solution and shares their timeline for the changes. They also mention considerations for state management, recognizing performance issues, and the possibility of open-sourcing their solution.
How to Communicate Technical Ideas to Non Technical AudiencesWatch video: How to Communicate Technical Ideas to Non Technical Audiences
React Summit US 2024
25 min
How to Communicate Technical Ideas to Non Technical Audiences
Welcome to the session on communicating technical information to non-technical audiences. Today, we will explore how to apply your existing communication skills to share technical jargon. Understanding your audience through asking questions, making observations, and doing research is key to successful communication. When communicating with non-technical audiences, consider their baseline knowledge and avoid making assumptions. Use jargon when it is understood by all and explain unfamiliar terms when necessary. Analogies and stories can be effective in explaining complex concepts. Visual aids and experiences can enhance presentations. Clarify the purpose of communication to avoid misunderstandings. Utilize resources like written communication, podcasts, and videos to educate team members. Include others in technical conversations to learn and build something bigger. Effective communication requires context and understanding. Utilize the course 'Technical Communication for Non-Technical Audiences' on Pluralsight for further guidance.
Nue: The UX Framework for the WebWatch video: Nue: The UX Framework for the Web
JSNation US 2024
21 min
Nue: The UX Framework for the Web
Hello, everyone. My name is Tero Piirainen, a software engineer from Helsinki, Finland. I'm introducing a new UX framework for the web called Nue. It provides better tooling, code basis, and resulting websites compared to established frameworks like Next.js or Beat or Astro. Nue is incredibly fast, 100 times faster than Next.js, with improved hot reloading times. Simplicity is a key advantage of Nue, offering instant browser reactions to saved files and quick updates with hot reloading. Nue emphasizes timeless skills and focuses on design engineering, transitioning from JavaScript to modern CSS. Gnu, a component of Nue, focuses on CSS and offers small and fast websites with built-in turbo-linking and view transition motion effects. Overall, Nue and Gnu provide a simpler, faster, and more flexible development experience with a focus on user experience and design engineering.
Building C++ / JSI Native Modules for React Native in 2024Watch video: Building C++ / JSI Native Modules for React Native in 2024
React Summit US 2024
17 min
Building C++ / JSI Native Modules for React Native in 2024
In this talk, the speaker discusses the process of building C++ native modules for React Native. They explain that native modules allow for tighter platform integration and access to platform-independent performance code, but come with trade-offs such as increased build times and potential issues with crashes and package dependencies. The speaker clarifies the differences between the old and new architecture of React Native, highlighting the introduction of the JavaScript interface (JSI) and its benefits. They also explore alternative React Native architecture options, including TurboNativeModules and LegacyNativeModules. The speaker discusses the challenges of working with legacy native modules and the benefits of using NitroModules and pre-building native code. They conclude with recommendations for using Nitro modules, pre-building, and utilizing a compiler cache to optimize build times.
Featured
Chrome DevTools: State of the Union 2024 - Debugging React & BeyondWatch video: Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
React Summit US 2024
30 min
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
Top ContentHi folks, in this Talk we learn about React and Chrome DevTools. We explore the new AI Assistant panel in DevTools that helps with UI tweaking. React DevTools now supports Gemini AI model for error fixing. Extensibility is important and React DevTools has features like highlight updates and server components. We also learn about server logging in the browser console and toggling suspense fallbacks. Browser DevTools allow experimenting with local overrides and improving color contrast. Advanced features include overriding headers, network panel customization, and performance tooling. We also discuss Core Web Vitals, optimizing pages, and debugging UI with DevTools. There are fun tips for enhancing animations and logging workflow. The Talk ends with Q&A and sharing/removing features based on user feedback.
Embracing WebGPU and WebXR With Three.js
JSNation 2024
27 min
Embracing WebGPU and WebXR With Three.js
The 3JS project has evolved into a community-driven effort with numerous contributors over the past 14 years. It started with 3D engine work in Flash and transitioned to using SVGs for rendering in HTML5 before adopting WebGL. The project showcases various projects and frameworks, including a no-code tool powered by 3.js. The team is working on a new render using WebGPU and developing a new shader language called TSL. The hope is that WebGPU will eventually replace WebGL, offering better control and performance.
Install Nothing: App UIs With Native Browser APIs
JSNation 2024
31 min
Install Nothing: App UIs With Native Browser APIs
This Talk introduces real demos using HTML, CSS, and JavaScript to showcase new or underutilized browser APIs, with ship scores provided for each API. The dialogue element allows for the creation of modals with minimal JavaScript and is supported by 96% of browsers. The web animations API is a simple and well-supported solution for creating animations, while the view transitions API offers easy animation workarounds without CSS. The scroll snap API allows for swipers without JavaScript, providing a smooth scrolling experience.
Abracadabra: The Vanishing Network
React Summit US 2024
32 min
Abracadabra: The Vanishing Network
I am so excited to share my software development experience. The talk focuses on React and the Vanishing Network, aiming to make network management disappear. It starts with the multi-page app paradigm and moves towards enhancing user experience and transitioning to single-page app architecture. The talk discusses eliminating duplication, transitioning to a JSON API, and utilizing React and user actions. It explores progressive enhancement with Remix, moving to modern React with server components, and enhancing server-client communication and UI. It also covers server-client code separation, Epic React version two, AI plugins, Next.js, trade-offs, testing, SQL queries, and optimizing for change.
Case Study: Building Accessible Reusable React Components at GitHubWatch video: Case Study: Building Accessible Reusable React Components at GitHub
React Summit 2024
29 min
Case Study: Building Accessible Reusable React Components at GitHub
The talk discusses building accessible React components and emphasizes the importance of using the correct HTML elements and ARIA roles for accessibility. It explains how to navigate and select options within a form and how to add supplementary text using Aria described by. The speaker also discusses the benefits of using conditional checkboxes and ARIA disabled to improve the UI. Additionally, the talk explores the role of JavaScript in web accessibility and provides recommendations for testing website accessibility.
React Server Components in AI Applications
React Advanced 2024
17 min
React Server Components in AI Applications
Today we will discuss React server components with AI and how to build a better search experience using them. We will learn how to make a Next.js app AI-enabled using the Vercel AI SDK. The Vercel AI SDK's streamUI function with the GPT 4.0 model will be used to make suggestions interactive. We will explore the use of history and conversation in AI and how to continue the conversation and read the result. The concept of generative UI with the vector database will be introduced, along with querying the database for movies. We will process user queries and return movies based on them. The power of React server components in enhancing UI will be demonstrated. In summary, the Talk covers vector embeddings, natural language search, and generative UI.
Building a Better Hammer - The Story of Nuxt 4
Vue.js Live 2024
28 min
Building a Better Hammer - The Story of Nuxt 4
Nuxt is a framework for building web apps using Vue and Nitro, driven by a vibrant open source community. Nuxt 4 aims to make the framework more usable and extensible, while focusing on collaboration rather than competition. The modules ecosystem and pluggable architecture enhance Nuxt's functionality and customization options. Nuxt prioritizes user choice and aims for stability and reliability. Nuxt 4 introduces thoughtful breaking changes and is eagerly anticipated by the community.
Panel Discussion: Future of ReactWatch video: Panel Discussion: Future of React
React Summit US 2024
39 min
Panel Discussion: Future of React
7 authors
We're going to be doing a future of React panel discussions. React 19 is in RC stage and we're excited to hear when it will be stable. The React compiler is here to stay and is the future of developer experience and tooling. React 19 brings exciting features like RSCs and consolidation of the framework. React's commitment to community and innovation is commendable. The React team values feedback and actively engages with the community. React's future includes supporting the community and enabling smooth migrations. There's a need to teach underlying concepts and educate AI systems. Teaching and adapting to React can be challenging. The React compiler changes default re-rendering behavior. Collaboration with Next.js and Vercel has been valuable for React's development. Appreciation for the community and partnerships with Vercel and Microsoft.
You Don’t Know How to SSR
DevOps.js Conf 2024
23 min
You Don’t Know How to SSR
The Talk covers the speaker's personal journey into server-side rendering (SSR) and the evolution of web development frameworks. It explores the use of jQuery for animations in SSR, the challenges faced in integrating React with Umbraco, and the creation of a custom SSR framework. The Talk also discusses the benefits of Next.js and the use of serverless artifacts for deployment. Finally, it highlights the features of Astro, including its function per route capability.
The Ai-Assisted Developer Workflow: Build Faster and Smarter Today
JSNation US 2024
31 min
The Ai-Assisted Developer Workflow: Build Faster and Smarter Today
AI is transforming software engineering by using agents to help with coding. Agents can autonomously complete tasks and make decisions based on data. Collaborative AI and automation are opening new possibilities in code generation. Bolt is a powerful tool for troubleshooting, bug fixing, and authentication. Code generation tools like Copilot and Cursor provide support for selecting models and codebase awareness. Cline is a useful extension for website inspection and testing. Guidelines for coding with agents include defining requirements, choosing the right model, and frequent testing. Clear and concise instructions are crucial in AI-generated code. Experienced engineers are still necessary in understanding architecture and problem-solving. Energy consumption insights and sustainability are discussed in the Talk.
Trending today
Understanding the New Event Loop in React Native
React Advanced 2024
29 min
Understanding the New Event Loop in React Native
I'm going over the new event loop in React Native, which is one of the more interesting parts of the new architecture. The new architecture includes the JSI for synchronous communication between layers, new Native modules for type safety and code sharing, and the Fabric renderer for prioritized rendering and support for modern React 18 features. The React Native event loop works differently from the previous architecture, executing tasks and updating rendering. The React Native team can now schedule JavaScript code within React components to execute at specific times, allowing for control over the execution schedule. React Native can now prioritize rendering urgent events, resulting in a more synchronized and flicker-free UI. The goal of the new event loop specification is to align React Native more closely with the web, providing capabilities and behaviors similar to the web. Migrating to the new React Native architecture aims to minimize fundamental changes for existing codebases and ensure proper support from library maintainers.
It’s Time to Fall in Love With CSS (Again)Watch video: It’s Time to Fall in Love With CSS (Again)
JSNation US 2024
11 min
It’s Time to Fall in Love With CSS (Again)
Hi, I'm Tony Alisea, a developer with over 25 years of experience. CSS won in the 90s due to its separation of structure and presentation, cascade concept, and powerful selectors. JavaScript developers fell out of love with CSS when they started using frameworks to construct the DOM. Instead of looking at the DOM holistically, we began to think in terms of componentization. CSS has continued to grow and add extraordinary features, such as CSS nesting and cascade layers. CSS layers give more control over the layering of CSS styles. Container queries allow us to respond to the size of the container instead of the viewport. The has pseudo class enables selecting parent elements. CSS is now more component-friendly and improves the user experience.
ESLint One for All Made Easy
React Day Berlin 2024
21 min
ESLint One for All Made Easy
Hello everyone! I'm Anthony Fu, a coaching member of Vit, Vue, and Nuxt. Today, I'll share my findings and practices in exploring ESLink and its ecosystem. ESLink v9.0 released 7 months ago with the new FlatConfig, which simplifies plugin configuration and provides full control and customization in JavaScript. Migrate legacy config to FlatConfig with eslink-migrate-config CLI and use eslink-config-inspector for visualized step tool. Flag config utilities make config customization easier and allow project-aware configs. ESLink is a powerful AST toolkit and can be used as a formatter. Use ESLink for maintaining stylistic rules and customize it to fit your project's needs.
Tanstack Start - A Client-Side First Full-Stack React Framework
React Summit US 2024
30 min
Tanstack Start - A Client-Side First Full-Stack React Framework
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.
You Can’t Use Hooks Conditionally… or Can You?Watch video: You Can’t Use Hooks Conditionally… or Can You?
React Summit 2023
28 min
You Can’t Use Hooks Conditionally… or Can You?
Top ContentThe Talk discusses the use of the Use hook in React and its ability to be used conditionally. It explains the concept of the fiber tree and how hooks values are stored in memory. The Talk also delves into the conditional use of useContext and how it differs from useState. It explores the process of updating context values and optimizing context rendering. The role of the provider in managing context values and rendering is emphasized.
How to Show 10 Million of Something: Frontend Performance Beyond Memoization
React Day Berlin 2024
29 min
How to Show 10 Million of Something: Frontend Performance Beyond Memoization
Today's Talk focused on performance optimization in React apps, specifically in handling and rendering enormous amounts of data. The speaker discussed various techniques and tools to achieve better performance, such as optimizing data relay, rendering, data processing, memory usage, and denormalization. They also highlighted the importance of optimizing network performance, payload size, and request handling. The Talk emphasized the need to measure before optimizing, focus on bottlenecks, and make small improvements that actually benefit users. Overall, the Talk provided valuable insights and recommendations for improving performance in React apps.
Why You Should Use Redux in 2024
React Summit 2024
33 min
Why You Should Use Redux in 2024
Top ContentMark Erickson explains the history, creation, evolution, and benefits of Redux. Redux was designed to make state updates and action history maintenance easy, incorporating functional programming principles. Redux Toolkit was created to simplify Redux usage. Redux is still a valid choice for its consistent pattern and separation of state from UI. The decision to use Redux depends on the specific use case and the need for centralized state management.
If You Were a React Compiler
React Summit US 2024
26 min
If You Were a React Compiler
Top ContentIn 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.
Case Study: Building Accessible Reusable React Components at GitHub
React Day Berlin 2024
22 min
Case Study: Building Accessible Reusable React Components at GitHub
Hey, I'm Sid, and I work on the design systems team at GitHub. Let's talk about building accessible React components with a focus on screen readers. Use the correct HTML element for accessibility. For example, on GitHub, there are three tabs with options. These tabs are made using buttons. Let's see how a visually impaired person using a screen reader would access this website. What do they see? I'm going to enable the screen reader and walk you through what happens. When turning on the screen reader, it sets the context and tells you where you are. For example, on the React app, a button labeled 'Code' has focus and a menu popup. Inside the popup, there are several buttons with different labels. Something interesting happens. If I can't see the UI, I'm hearing buttons but no tabs. Screen readers cannot infer things like tabs from visual design. To provide this information, we can use the ARIA spec and its roles. By adding a role tab list to the div and role tab to each button, the semantics are conveyed. The role overrides HTML semantics. Screen reader identifies tabs, pronounces 'code spaces'. Default behavior of a tab is auto-focus. We can add aria-selected attribute to specify selection. Using React, I'm using an expression to set aria-selected based on the selected tab. The navigation into the tab panel is disorienting. There are separate groups for the tab list and tab panel, and there is a need for navigation between them. Use arrow keys to navigate within the widget. Remove tabs from the tab index, only the selected tab should be focusable. Implement arrow keys for navigation. Press tab to enter the tab panel. Press shift tab to go back up. Keyboard navigation is a common pattern extracted into a hook. Decide which keys to bind based on the widget type. Change selected tab on focus. Consider the ARIA authoring practices guide for keyboard interactions. Differentiate between instant and activated tabs. Follow the ARIA spec and use the APG as an informative resource. Screen readers may not always follow the ARIA authoring practices guide. Use correct HTML elements, add ARIA roles, properties, and states. Implement keyboard navigation. Use a GitHub example of notification settings with proper semantic elements. When selecting notification channels, the options are presented in a pop-up. The focus is on the first checkbox, indicating that it is the first option. The screen reader reads the status of each option. After selecting the desired option, the form can be submitted. The change is saved and the user is notified. The focus is recontextualized on the collapsed menu popup button. Not rendering the fourth option in certain conditions hides it from screen users. Removing the conditional and disabling the fourth checkbox until necessary eliminates this issue. Using IR disabled instead of disabled makes the element accessible for screen reader and keyboard users without affecting styling or click cancellation. You have to add your own class name and make sure it is disabled. It is accessible by keyboards. Voiceover on Mac uses 'dimmed' to signify IR disabled. Adding another span that requires at least one channel. Additional descriptions can be added using aria-describeby. SCREEN READER Only notify for failed workflows. Requires at least one channel to be selected. Dimmed unticked. Tick box. Now you know the label, why it is disabled, and that it's dimmed. And let's see if it's If I mean. Never. Menu popup collapsed. This flow seems more intuitive. You know all your options up ahead. One option was disabled, enabled something else, and it became enabled again. Much more clear. Feels like a better UI. We need to design with accessibility in mind. Accessibility isn't something that you can just sprinkle on in the end. We have to bring it way earlier in the stage. Be careful when disabling elements. Use RLDisabled. Short list of six things to consider. Links on my website. Follow me on Blue Sky.
Short takes
What’s the Deal With Drizzle ORM?
JSNation 2024
8 min
What’s the Deal With Drizzle ORM?
Drizzle is a TypeScript ORM that leverages SQL knowledge, is fast and has its own ecosystem. It manages database schema and supports prepared statements for peak performance. Drizzle provides a complete set of tools, including Drizzle Studio and query runners. The ecosystem includes GraphQL integration and community-built tools.
Empowering Nx with AI
React Summit 2024
8 min
Empowering Nx with AI
Today's Talk discusses empowering NX with AI and building an AI-powered documentation system. NX is a powerful build system with smart features like project graph analysis and dependency management. The AI features include an assistant for streamlined navigation of documentation, AI error explainer, and resource allocation optimization on NX Cloud. The AI-powered documentation system uses embeddings and vector matching to find relevant Docs, utilizing tools like OpenAI, GPT, Superbase, and Vercel's AI SDK.
Building a sophisticated CodePipeline with CDK in a Monorepo Setup
DevOps.js Conf 2024
8 min
Building a sophisticated CodePipeline with CDK in a Monorepo Setup
Imagine starting as an AWS DevOps engineer in a small company. Your boss wants an all-in AWS approach, with CICD entirely on AWS for automated deployments. Use AWS CDK for creating a pipeline, stages, and actions. Learn how to handle multiple pipelines for different accounts and handle manual approval for staging and production environments. Discover how to trigger pipelines with EventBridge and Lambda, and create sophisticated pipelines for different scenarios.
A Better Starting Point
React Summit 2024
7 min
A Better Starting Point
In this talk, the speaker introduces CreateNextApp and CreateT3App as tools for quickly setting up Next.js projects. CreateT3App has a modular CLI that allows users to select specific technologies. The speaker also discusses E3env, which ensures control of environment variables, and T3 Turbo, a monorepo version of CreateT3App that offers flexibility for installation and deployment.
Applying React Principles to a Cloud Database
React Summit 2024
7 min
Applying React Principles to a Cloud Database
React principles can break down for full-stack apps, but Convex has built a backend and database to address this. The five React principles discussed include reactivity, consistency, overlapping writes, and caching. Convex's database ensures consistency, handles overlapping writes with transactions, and automatically invalidates caches based on relevant writes. Convex combines the best of SQL and NoSQL databases and applies React principles to simplify app development and improve the user experience.
Build Your Own Component Library, With `Shadcn-vue`
Vue.js Live 2024
7 min
Build Your Own Component Library, With `Shadcn-vue`
Shed CN Vue is a component library that allows for easy customization of components and styling. It is built on top of RedixView, which enables the use of primitives and element customization. Tailwind CSS is used for easy customization of layout, styling, animations, classes, and icons. The documentation provides more details on how to leverage these features.
Aligning Patterns Across Design and Development
React 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.
AI in Front-End Dev: Your Creative Partner or Job Snatcher?
JSNation 2024
8 min
AI in Front-End Dev: Your Creative Partner or Job Snatcher?
Top ContentAI in front-end development empowers developers to take on more ambitious projects and innovate at a faster pace. Natural language is a new programming language that can be used for coding, learning, and automating complex tasks. However, it is important to remember that AI is a supplement to human capabilities, not a replacement. Developers need to evolve their skills and stay ahead of emerging technologies to work effectively with AI. The demand for AI engineers is high.
Forget Polygons – Gaussian Splats, the New Approach to Photorealistic 3D Graphics
JSNation 2024
5 min
Forget Polygons – Gaussian Splats, the New Approach to Photorealistic 3D Graphics
Today, I'll be talking about GspotJS and Gaussian Splatting, a revolutionary graphics pipeline that can render high-fidelity scenes at 144 FPS. Gaussian Splatting is a technique that converts data directly into an image using Gaussians. GspotJS is a lightweight JavaScript library for Gaussian Splat rendering, with features like 4D rendering. The library aims to provide a simple and speedy way to view Splats on the web, while more advanced applications can use Mackellog Gaussian Splats 3D. Both Gaussian Splatting and gSplotJS are open-source.
Nested Interactive Elements: A Nightmare in Accessibility
React Summit 2024
9 min
Nested Interactive Elements: A Nightmare in Accessibility
Nested Interactive Elements in Nightmare Accessibility can cause issues with screen readers and other assistive tools, making it difficult for users to interact with websites. Mitigation strategies include unnesting elements, using CSS overlay, and being cautious when modifying roles. It is recommended to involve users of assistive tools in focus groups and share solutions online.
Popular
Faster TypeScript builds with --isolatedDeclarations
TypeScript Congress 2023
24 min
Faster TypeScript builds with --isolatedDeclarations
Top ContentThis talk discusses the performance issues in TypeScript builds and introduces a new feature called isolated declarations. By running the compiler in parallel and using isolated modules, significant performance gains can be achieved. Isolated declarations improve build speed, compatibility with other tools, and require developers to write types in code. This feature has the potential to further increase performance and may be available in TypeScript soon.
HTTP/3 Performance for JS Developers
JSNation 2023
21 min
HTTP/3 Performance for JS Developers
Top ContentHTTP 3, also known as H3, is the latest version of the HTTP protocol with new performance-related features. Enabling HTTP 3 requires minimal effort and provides significant benefits, but limits fine-grained control over performance features. Zero RTT has limitations due to security reasons and restrictions on allowed requests. Resource loading and prioritization in HTTP 3 have some problems, as browsers may not agree on resource importance. Fetch priority allows fine-grained control over resource loading order, and resource discovery can be improved with 103 Early Hints. Web transport provides low-level access to QUIC and HTTP3 features for real-time use cases.
Welcome to Nuxt 3
Vue.js London Live 2021
29 min
Welcome to Nuxt 3
Top ContentNux3 has made significant improvements in performance, output optimization, and serverless support. Nuxt Bridge brings the Nitro engine for enhanced performance and easier transition between Nuxt 2 and Nuxt Read. Nuxt 3 supports Webpack 5, Bytes, and Vue 3. NextLab has developed brand new websites using Docus technology. Nuxt.js is recommended for building apps faster and simpler, and Nuxt 2 should be used before migrating to Nuxt 3 for stability. DOCUS is a new project that combines Nuxt with additional features like content modules and an admin panel.
Let's Build React Query in 150 Lines of Code!
React Summit Remote Edition 2021
30 min
Let's Build React Query in 150 Lines of Code!
Top ContentReact Query is a popular data synchronization library used by indie developers, startups, and Fortune 500s, with over 1,200 commits and 250 contributors. The Talk covers the creation of a simplified version of React Query called React Query Lite. It explores concepts like caching, background fetching, and garbage collection. The speaker also discusses the use of query observers and the integration of React Query with React. The Talk concludes with a discussion on React Native tools, testing, and the stability of React Query's API.
Options API vs Composition API: Choosing the Right Approach for Your Team
Vue.js London Live 2021
23 min
Options API vs Composition API: Choosing the Right Approach for Your Team
Top ContentToday's Talk discusses the Options API and Composition API in Vue 3, highlighting the differences and considerations when choosing an approach. The Composition API offers more flexibility and integrates well with TypeScript, but may require more familiarity with JavaScript. Combining both APIs allows for structure and flexibility, with the ability to progressively enhance code. Team preferences and the level of TypeScript usage should be considered when choosing the right approach for a project.
(Easier) Interactive Data Visualization in React
React Advanced 2021
27 min
(Easier) Interactive Data Visualization in React
Top ContentThis Talk is about interactive data visualization in React using the Plot library. Plot is a high-level library that simplifies the process of visualizing data by providing key concepts and defaults for layout decisions. It can be integrated with React using hooks like useRef and useEffect. Plot allows for customization and supports features like sorting and adding additional marks. The Talk also discusses accessibility concerns, SSR support, and compares Plot to other libraries like D3 and Vega-Lite.
Building a JS Engine -- For Fun!
JSNation 2024
9 min
Building a JS Engine -- For Fun!
Top ContentThe Talk discusses the basics of building a JS engine, highlighting the complexity and feature completeness of existing engines. It emphasizes the possibility of creating a simpler engine tailored to specific use cases and target audiences. The speaker suggests starting anywhere in the process and provides tips on using parser libraries, implementing runtime features, and ensuring correctness through testing. Additionally, the Talk encourages exploring JavaScript standards and engaging with the open-source community.
From Blender to the Web - the Journey of a 3D Model
React Advanced 2021
27 min
From Blender to the Web - the Journey of a 3D Model
Top ContentThis Talk is about Blender, a free and open-source 3D software, and integrating 3D models into websites. The speaker discusses exporting 3D models to the web using the gltf format and compressing them using gltf transform and draco compression. They also cover integrating the 3D model into a website using React and React 3 fiber, troubleshooting installation and error issues, and working with refs and frames. The Talk explores rendering, lighting, mathematics, and experimentation in 3D, as well as interaction and rendering effects. The speaker also mentions their favorite creation in Blender.
Everything Beyond State Management in Stores with Pinia
Vue.js London Live 2021
34 min
Everything Beyond State Management in Stores with Pinia
Top ContentState management is not limited to complex applications and transitioning to a store offers significant benefits. Pinia is a centralized state management solution compatible with Vue 2 and Vue 3, providing advanced devtools support and extensibility with plugins. The core API of Pinia is similar to Vuex, but with a less verbose version of stores and powerful plugins. Pinia allows for easy state inspection, error handling, and testing. It is recommended to create one file per store for better organization and Pinia offers a more efficient performance compared to V-rex.
AI for React Developers: Opportunities, Learning, and Innovation
React Summit 2024
9 min
AI for React Developers: Opportunities, Learning, and Innovation
Top ContentAI offers opportunities for React developers to code faster and automate tasks. Generative AI is a crucial area for developers to focus on. Working with AI APIs and RAGS can open up new possibilities for projects. Orchestration frameworks and tools like Lanchain and relevance help chain tasks together and work with different AI models. AI is a supplement to human capabilities and learning to code with AI can help developers push boundaries and become better.
JavaScript
Temporal: Modern Dates and Times in JavaScript
JSNation 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!
Webdevelopment Tailored for 2024
React Summit 2024
7 min
Webdevelopment Tailored for 2024
Today's Talk covers native features in browsers, including upcoming ones and the Interop Project. Native features offer speed, compatibility, and improved debugging. Notable examples include dynamic viewport units, flexbox/grid gap, container queries, and motion path. The Interop Project ensures consistent web platform features across different browsers. Upcoming features like native CSS nesting and entry/exit animations are on the horizon.
Testing: Do More With Less
JSNation 2024
27 min
Testing: Do More With Less
This talk focuses on practical approaches for testing Node.js applications, including the use of Dora metrics and the testing trophy strategy. It emphasizes the importance of covering critical flows with integration and end-to-end tests, while also considering the cost and speed of different test types. The speaker recommends mocking third-party services and using snapshot testing, but warns about the potential for false positives. Playwright is suggested as a preferred tool, and the importance of automated test execution is emphasized.
Peace, Love and JavaScript
Node Congress 2024
17 min
Peace, Love and JavaScript
The OpenJS Foundation supports the entire JavaScript ecosystem and thousands of open source projects. They follow a neutral nonprofit organization with separate business and technical governance to minimize drama. Rebooting governance and addressing intellectual property can also help reduce conflicts. OpenJS provides collaboration spaces and support in various areas for open source projects. They foster a collaborative environment and invite participation in their projects.
Future of Frontend Frameworks Fireside Chat
React Summit 2024
28 min
Future of Frontend Frameworks Fireside Chat
6 authors
Signals are being adopted by popular frameworks, enabling code reuse and improved tooling. While merging between frameworks is unlikely, they are learning from each other and adopting shared practices. It is important to embrace the diversity of frameworks and libraries. Instead of merging, focus on standardizing the principles behind frameworks. Consider tradeoffs and benefits when choosing a framework, and explore different technologies to learn new ideas.
React
If You Were a React Compiler
React Summit US 2024
26 min
If You Were a React Compiler
Top ContentIn 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.
The Art of Ignoring Best Practices for React Performance
React Summit 2024
19 min
The Art of Ignoring Best Practices for React Performance
This Talk introduces the concept of being a 'React bad boy' by ignoring best practices and optimizing React rendering. It explains how to avoid unnecessary rerenders using React.memo and React DevTools. It also covers advanced techniques like isolating state changes and lazy loading hooks. The Talk explores reducing component rerenders using Svelte stores and optimizing with swap stores in Redux. These techniques improve React performance without the need for major refactors or rewrites.
The Suspense Quest - Inside React's Magic
React Summit 2024
30 min
The Suspense Quest - Inside React's Magic
This Talk explores the suspense component in React and its benefits in handling fetched data. It delves into the rendering process of React components and how suspense anticipates requests. The offscreen fiber is introduced as a hidden component that ensures state continuity. The Talk also discusses the usage of suspense for handling concurrent queries and throwing promises, as well as the integration of Redux and the upcoming changes in React 19. Overall, the Talk provides insights into the workings of suspense and its potential applications in software development.
Sketching with Code: Integrating React and p5.js
React Summit US 2024
30 min
Sketching with Code: Integrating React and p5.js
Hello React Summit! Senior software engineer building educational experiences at NewZella. Passionate about helping people get involved with open source. Creative coding journey started on Neopets. Have a CodePen with examples in p5.js, svg.js, and CSS. Talk is about p5.js and React, building an application to generate a grid pattern. Incorporating user inputs into the creative process using p5.js and React. Art exhibit at the Wellcome Museum inspired by generative art. True shade tiles and the 10 print algorithm inspired the pattern in our example. p5.js is a JavaScript library for creative coding, accessible to different backgrounds. Order is important in p5.js. React is better at managing complex state. Use the p5.js React wrapper to simplify integration. Use p5.js in instance mode to avoid naming collisions. Instance mode is safer and helpful as the project grows. Use destructuring to get values from input. Lerp color function creates color gradients. Use random seed for consistent random numbers in animations. Struggling with making the Canvas mobile-friendly. Animating P5.js sketches without relying on CSS. Optimizing canvas elements. P5.js and WebGL for 3D rendering. Conclusion and appreciation.
Scaling React Performance: From Basic to Advanced Code-Splitting Techniques
React 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.
Building End-to-End Encrypted Apps (Web & React Native)
React Summit 2024
32 min
Building End-to-End Encrypted Apps (Web & React Native)
This Talk explores the concept and advantages of end-to-end encryption in software development. It discusses the challenges of data encryption and conflict resolution in collaborative apps. The integration of end-to-end encryption with conflict-free replicated data types (CRDTs) is highlighted. The talk also covers simplified document sync, real-time sync and encryption, key management, and authentication. Additionally, it mentions the importance of local-first integration, CRDT frameworks, and data search indices.
Everything You Thought You Knew About React Functional Components Is Wrong
React 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.
Build AI Apps in 5 Minutes: Live Demo With Vercel AI Sdk, v0.dev, and Rag!
React Summit US 2024
12 min
Build AI Apps in 5 Minutes: Live Demo With Vercel AI Sdk, v0.dev, and Rag!
I'm doing a quick lightning talk today, talking about saying no to boilerplate and teaching you how to build an AI app in just minutes. We're going to talk about RAG, v0, fine-tuning for sales AI to SDK, and then talk a little bit about Entity Resolution and your AI toolkit. RAG is a hot topic in chatbot development and allows for creating chatbots with a deeper understanding of specific use cases. Rag offers a versatile AISDK that allows for easy model switching, augmentation, and fine-tuning. Entity resolution is important for resolving entities across multiple points of data, with use cases in personalized marketing, healthcare, and fraud detection.
Tanstack Start - A Client-Side First Full-Stack React Framework
React Summit US 2024
30 min
Tanstack Start - A Client-Side First Full-Stack React Framework
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.
React in the Autonomous Robotics Industry
React Summit 2024
11 min
React in the Autonomous Robotics Industry
Hamza Hawi, a software engineer at the Autonomous Robotics Research Center, discusses the use of React and Leaflet in robotics. The research center utilizes a mixed fleet of robots and relies on React for mission planning software, while Leaflet is used for mapping and custom layers. Leaflet offers flexibility for different types of vehicles and supports the creation of custom layers like image and video overlays. Additionally, the talk mentions the use of video overlays for weather forecasts and optimizing joystick usage with a strategy design pattern.
Node.js
Understanding Package Resolution in Node.js
Node Congress 2024
11 min
Understanding Package Resolution in Node.js
In this Talk, the speaker discusses package resolution in Node.js, covering topics such as CommonJS, ES modules, package.json structure, and package.json loader. The Talk also touches on conditional loading and file extension resolution, module import and export, module type determination based on file extensions and package.json, module resolution strategies in Node.js, and tips for improving loading time in ESM applications.
Creating an HTTP Server from Scratch with Node-addon-api, Libuv, and Milo
Node Congress 2024
18 min
Creating an HTTP Server from Scratch with Node-addon-api, Libuv, and Milo
Today's Talk focuses on creating an HTTP server from scratch using Node.js and native add-ons. The process involves implementing a TCP socket using LibuV for data exchange between the server and client. The Talk also covers invoking callbacks, creating a high-level abstraction for the HTTP server, and parsing HTTP data using an experimental HTTP parser called Milo. The project serves as a proof of concept, showcasing the ease of creating add-ons and interacting with low-level APIs in Node.js.
Deep Dive into Undici
Node Congress 2024
24 min
Deep Dive into Undici
Undici is a modern HTTP client for Node.js that offers improved performance and advanced features. It supports HTTP 1.1 and recently added HTTP 2.0 support. Undici provides impressive performance, especially with Undici.Stream. It also supports HTTP 1.1 pipelining, which can significantly cut response time. Undici offers flexible connection management and dispatchers, as well as interceptors for customization. Undici v7 is coming with improved APIs and platformatic runtime for running multiple microservices in the same process.
Parsing Millions of URLs per Second
Node Congress 2024
14 min
Parsing Millions of URLs per Second
Today's talk explores the performance of URL parsing in Node.js and introduces the ADA URL parser, which can parse 6 million URLs per second. The ADA URL parser includes optimizations such as perfect hashing, memoization tables, and vectorization. It is available in multiple languages and has bindings for popular programming languages. Reach out to Ada URL and Daniel Lemire's blog for more information.
Guardians of the Applications: Conquering Node.JS App Monitoring
DevOps.js Conf 2024
21 min
Guardians of the Applications: Conquering Node.JS App Monitoring
Monitoring and observability are important for catching bugs before they become noticeable. Examples of monitoring issues include confusion and frustration when monitoring leads to misunderstandings. Teamwork is essential for effective monitoring, automation can streamline processes and improve efficiency. Custom monitoring is necessary to prevent hazards and unnecessary alerts can hurt productivity. Challenges include relying too much on monitoring without addressing root issues and struggling with manual configuration.
Making My Node.js API Super Fast
Node Congress 2024
34 min
Making My Node.js API Super Fast
This talk focuses on improving performance in Node.js API development. It covers various areas such as optimizing database work, connection pool, JSON parsing, logging, and web framework selection. Key highlights include the use of Native Mongo Driver for better database performance, optimizing connection pool for improved throughput, replacing Express serializer for faster serialization and deserialization, and choosing Festify as an efficient web framework. Caching and authentication's impact on performance is discussed, along with recommendations for caching types. The talk also emphasizes considering environmental factors and human impact on performance. Fastify is highlighted as a recommended tool for Node.js performance optimization.
Milo, a New HTTP Parser for Node.js
Node Congress 2024
23 min
Milo, a New HTTP Parser for Node.js
Hello and welcome to Node Congress 2024. NearForm focuses on delivering modern and elegant solutions. Milo is a new HTTP parser written in Rust, designed to address the complexity and vulnerabilities of the current Node HTTP parser. Milo allows developers to opt-in for copying data being parsed for improved developer experience. It follows the latest RFCs for HTTP strictly and provides a common interface across different languages. Milo is being explored for C++ and WebAssembly integration, and future steps include performance improvements and regression testing.
The Need for Speed: How AWS New JS Runtime is Redefining Serverless Latency
Node Congress 2024
25 min
The Need for Speed: How AWS New JS Runtime is Redefining Serverless Latency
Serverless services like AWS Lambda allow developers to build modern applications without provisioning servers or additional infrastructure. LLRT is a low latency runtime designed specifically for serverless environments and JavaScript applications. LLRT uses a lightweight JavaScript engine called Quick.js, achieving fast execution and performance with minimal memory consumption. LLRT is ideal for latency-critical applications, high-volume functions, and integration with AWS services. It significantly improves performance, reducing cold starts and providing consistent warm start times. Users are encouraged to test LLRT and contribute to its development.
Testing
Accessibility Granted: Building Inclusive Components One Test at a TimeWatch video: Accessibility Granted: Building Inclusive Components One Test at a Time
React Summit US 2024
18 min
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.
AI-Powered E2E UI Testing: Faster Creation, Easier Maintenance
JSNation 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.
Twenty Years of Web Testing: From Selenium's Dawn to Vitest's PromiseWatch video: Twenty Years of Web Testing: From Selenium's Dawn to Vitest's Promise
JSNation US 2024
22 min
Twenty Years of Web Testing: From Selenium's Dawn to Vitest's Promise
My goal with this talk was to answer the question of why we have another test runner. The talk breaks down the history of web testing into three chunks: the click-through era, browser war one, and browser war two. It discusses the motivations behind browser test runners and node test runners, highlighting Karma as the first node-based runner that gained popularity. The rise of node-based test runners like Ava, Tape, Mocha, and Jest is attributed to their stability and ease of use compared to Karma. Jest faced challenges with module loading and transpiling, but its non-opinionated abstraction made it a suitable choice. The shift towards environment-aware runners like VTest allows for safer testing and aligns with the need for transpilation across different environments. Lastly, the talk touches on the future of test tooling and the implications of AI on testing.
Beyond React Testing Library: Testing React Libraries (and library-like code)
React 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.
Maestro & Expo: Crafting the Future of Efficient e2e Testing
React 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.
We May Not Need Component Testing
Vue.js Live 2024
26 min
We May Not Need Component Testing
Component testing is a gray area between integration and unit testing. The demo app focuses on the cart component and writing test cases for Playwright component test and VTest. The first cart test encounters a bug with the invisible method in View Test.
Navigating the Chaos: A Holistic Approach to Incident Management
DevOps.js Conf 2024
26 min
Navigating the Chaos: A Holistic Approach to Incident Management
This talk covers the importance of a structured process for incident management and the need for a business mindset. It outlines a five-pillar structured process and emphasizes the importance of staying calm and asking the right questions during incidents. The talk also highlights the importance of effectively identifying, categorizing, and investigating incidents, as well as prioritizing root causes and communicating incident resolutions. Additionally, it discusses the role of incident managers, proactive measures for continuous improvement, and the importance of preparation and a proactive mindset.
Advanced Playwright Techniques for Flawless Testing
JSNation 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.
Testing Alternative Runtimes with Node and Vitest
Node Congress 2024
25 min
Testing Alternative Runtimes with Node and Vitest
Welcome to my talk on testing alternative runtimes with Node and VTest. VTest is a popular testing framework that allows dynamic code evaluation and runs inside Cloudflare workers. Durable objects provide distributed JavaScript class instances with unique IDs and persistent storage for improved developer experience. The testing framework in Cloudflare workers automatically undoes writes to storage and supports seeding data. Mocking outbound fetch requests is also possible in Cloudflare workers.
No More Mocking! Write Better Tests For Your Nuxt Application With Contract Tests
Vue.js Live 2024
21 min
No More Mocking! Write Better Tests For Your Nuxt Application With Contract Tests
A single-page application utilized a server-side BFF layer to simplify authentication and data customization. Testing a BFF-based architecture involves contract testing and tool usage. Challenges arise when mocking server-to-server requests in a client-side and server-side architecture. Separate tests should be written for client-side and server-side components, with contract testing to ensure compatibility. Integration testing for the front-end and server-side can be done by replacing microservices with a sub-server.
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