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The Future of Frontend Development Back to the Future Rainer Hahnekamp 12.10.2022 Devoxx Belgium

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About Me... ● Rainer Hahnekamp ANGULARarchitects.io ● Trainings and Consulting @RainerHahnekamp Spring for Angular Devs https://www.ng-news.com https://www.youtube.com /c/RainerHahnekamp

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Agenda 1. Past & Present 2. Run Faster a. JavaScript b. Rendering 3. Run Less a. Framework's Code b. Our Code 4. (Personal) Assessment 5. Summary 6. Q&A

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Past & Present

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A J A X Birth of JavaScript 2010 2005 1996 2015 2020

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2010 2005 2015 2020

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The Big 3 Source: https://www.standard.co.uk/sport/tennis/tennis-2021-djokovic-nadal-serena-federer-b424996.html

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It's all about SPEED

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Run Faster ● Replace JavaScript with another language? ○ WebAssembly ○ Go/Rust ● Improve the Engine ○ V8: Chromium, Node, Deno ○ JavaScriptCore: Safari, Bun ● Improve the Rendering

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Run Less: Framework's Code

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Submit Cancel

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Submit Cancel 1. Click

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JavaScript Bundle Submit Cancel 2. DOM Event 1. Click

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JavaScript Bundle Source Code Submit Cancel 2. DOM Event 3. Interpret 1. Click

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JavaScript Bundle Source Code Submit Cancel 2. DOM Event Submit Cancel 3. Interpret 4. Update DOM 1. Click

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JavaScript Bundle Source Code Submit Cancel 1. Click 2. DOM Event Submit Cancel 3. Interpret 4. Update DOM

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JavaScript Bundle Source Code Submit Cancel 1. Click 2. DOM Event Submit Cancel 3. Interpret 4. Update DOM

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JavaScript Bundle Source Code Submit Cancel 1. Click 2. DOM Event Submit Cancel 3. Interpret 4. Update DOM

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Interpreter… Do we know that from somewhere else???

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Pseudocode: compiled vs. interpreted Compiled const button = document.createElement("button"); button.addEventListener("click", clickHandler); document.append(button); Interpreted const otherButton = { type: "button", label: "More Info", click: clickHandler }; class Framework { elements = []; addElement(element) { this.elements.push(element); } render() { for (const element of this.elements) { if (isComponent(element)) { renderComponent(element); } } } } new Framework().addElement(button).render();

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Source Build Source Code Bundler Source Code Framework Framework

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Source Build Source Code Compilation Source Code Framework

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JavaScript Bundle Compiled Source Code JavaScript Bundle Source Code 3. Interpret

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Run Less: Our Code

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Client Server Submit Cancel Only static Server Side Rendering Interactive Browser Application Step 1: Server-Side Rendering Browser Application Application Step 2: Hydration Innovation Area

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Possible Approaches 1. Code splitting a. via a Router b. Common Technique 2. Data Fetching on the Server 3. Non-interactive Components on the Server 4. On-Demand Hydration

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Different Technologies

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First Request Static HTML Classic Hydration App Interactive User Action 1 User Action 2 Server Client

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First Request Static HTML Data Fetching on the Server User Action 1 User Action 2 Server Client Next.js, Remix,... Data Fetching Logic Data Fetching Logic Data Fetching Logic App Interactive

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Lots of dependencies for Server-communication ● GraphQL ● OpenAPI ● State Management ○ Redux ● Transformation & Validation ○ date-fns ○ lodash ○ zod ○ markdown

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First Request App Interactive Static HTML Non-Interactive Components on the Server User Action 1 User Action 2 Server Client React Server Component, Astro,... Non-Interactive Components Data Fetching Logic Non-Interactive Components Data Fetching Logic Non-Interactive Components Data Fetching Logic

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Island Architecture with Astro

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First Request App Interactive On-Demand Hydration User Action 1 User Action 2 Server Client Qwik, Astro,... Static HTML Action-specific Code Action-specific Code Static HTML

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Personal Assessment

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Reality & Perception

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https://2021.stateofjs.com/en-US/

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● Existing frameworks have baked-in solutions for a variety of use cases ● Newcomers only excel in a certain spot ● Frameworks can adopt to new changes

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Is speed everything?

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Summary ● Tools will be replaced by re-writes in Go, Rust, etc. ● JavaScript as "web language" stays untouched ● Zero-Size Frameworks??? ● Return of the Backend

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Thanks!!!