Javascript

Bun v1.0

Published Oct 25, 2023

Updated Oct 25, 2023

2 min read

This article was written over 18 months ago and may contain information that is out of date. Some content may be relevant but please refer to the relevant official documentation or available resources for the latest information.

On September 8, 2023, Bun version 1 was released as the first production-ready version of Bun, a fast, all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript.

Why a new JS runtime

You may ask, we already have Node and Deno, so why would we need another javascript runtime, Well yes we had Node for a very long time, but developers face a lot of problems with it, and maybe the first problem is because it’s there for a very long time, it has been changing a lot between different versions and one of the biggest nightmares for JavaScript developers these days is upgrading the node version. Also, Node lacks support for Typescriptt.

Zig programming language

One of the main reasons that Bun is faster than Node, is the programming language it has been built with which is Zig. Zig is a very fast programming language, even faster than C (here is some benchmarks), it focuses on performance and memory control. The reasons it’s faster than C is because of the LLVM optimizations it has, and also the way it handles the undefined behavior under the hood

Developer Experience

Bun delivers a better developer experience than Node on many levels. First, it’s almost fully compatible with Node so you can use Node packages without any issues. Also, you don’t need to worry about JS Common and ES Modules anymore, you can use both in the same file, yup you read that right, for example:

import { useState } from 'react';
const React = require('react');

Also, it has a built-in test framework similar to Jest or Vitest in the project so no need to install a different test framework with different bundler in the same project like Webpack or Vite

import { describe, expect, test, beforeAll } from "bun:test";

Also, it supports JSX out-of-the-box

bun index.tsx

Also, Bun has the fastest javascript package manager and the most efficient you can find as of the time of this post

bun install

Bun Native APIs

Bun supports the Node APIs but also they have fun and easy APIs to work with like

Bun.serve() : to create HTTP server
Bun.file() : to read and write the file system
Bun. password.hash(): to hash passwords
Bun.build(): to bundle files for the browser
Bun.FileSystemRouter(): a file system router

And many more features

Plugin system

Bun also has an amazing plugin system that allows developers to create their own plugins and add them to the Bun ecosystem.

import { plugin, type BunPlugin } from "bun";

const myPlugin: BunPlugin = {
  name: "Custom loader",
  setup(build) {
    // implementation
  },
};

Conclusion

Bun is a very promising project, and it’s still in the early stages, but it has a lot of potential to be the next big thing in the JavaScript world. It’s fast, easy to use, and has a lot of amazing features. I’m very excited to see what the future holds for Bun and I’m sure it will be a very successful project.

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About the author(s)

Mark Shenouda
@MarkSShenouda @markshenouda

Incremental Hydration in Angular

Incremental Hydration in Angular Some time ago, I wrote a post about SSR finally becoming a first-class citizen in Angular. It turns out that the Angular team really treats SSR as a priority, and they have been working tirelessly to make SSR even better. As the previous blog post mentioned, full-page hydration was launched in Angular 16 and made stable in Angular 17, providing a great way to improve your Core Web Vitals. Another feature aimed to help you improve your INP and other Core Web Vitals was introduced in Angular 17: deferrable views. Using the @defer blocks allows you to reduce the initial bundle size and defer the loading of heavy components based on certain triggers, such as the section entering the viewport. Then, in September 2024, the smart folks at Angular figured out that they could build upon those two features, allowing you to mark parts of your application to be server-rendered dehydrated and then hydrate them incrementally when needed - hence incremental hydration. I’m sure you know what hydration is. In short, the server sends fully formed HTML to the client, ensuring that the user sees meaningful content as quickly as possible and once JavaScript is loaded on the client side, the framework will reconcile the rendered DOM with component logic, event handlers, and state - effectively hydrating the server-rendered content. But what exactly does "dehydrated" mean, you might ask? Here's what will happen when you mark a part of your application to be incrementally hydrated: 1. Server-Side Rendering (SSR): The content marked for incremental hydration is rendered on the server. 2. Skipped During Client-Side Bootstrapping: The dehydrated content is not initially hydrated or bootstrapped on the client, reducing initial load time. 3. Dehydrated State: The code for the dehydrated components is excluded from the initial client-side bundle, optimizing performance. 4. Hydration Triggers: The application listens for specified hydration conditions (e.g., on interaction, on viewport), defined with a hydrate trigger in the @defer block. 5. On-Demand Hydration: Once the hydration conditions are met, Angular downloads the necessary code and hydrates the components, allowing them to become interactive without layout shifts. How to Use Incremental Hydration Thanks to Mark Thompson, who recently hosted a feature showcase on incremental hydration, we can show some code. The first step is to enable incremental hydration in your Angular application's appConfig using the provideClientHydration provider function: ` Then, you can mark the components you want to be incrementally hydrated using the @defer block with a hydrate trigger: ` And that's it! You now have a component that will be server-rendered dehydrated and hydrated incrementally when it becomes visible to the user. But what if you want to hydrate the component on interaction or some other trigger? Or maybe you don't want to hydrate the component at all? The same triggers already supported in @defer blocks are available for hydration: - idle: Hydrate once the browser reaches an idle state. - viewport: Hydrate once the component enters the viewport. - interaction: Hydrate once the user interacts with the component through click or keydown triggers. - hover: Hydrate once the user hovers over the component. - immediate: Hydrate immediately when the component is rendered. - timer: Hydrate after a specified time delay. - when: Hydrate when a provided conditional expression is met. And on top of that, there's a new trigger available for hydration: - never: When used, the component will remain static and not hydrated. The never trigger is handy when you want to exclude a component from hydration altogether, making it a completely static part of the page. Personally, I'm very excited about this feature and can't wait to try it out. How about you?...

Mar 14, 2025

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AngularJavaScript

D1 SQLite: Writing queries with the D1 Client API

Writing queries with the D1 Client API In the previous post we defined our database schema, got up and running with migrations, and loaded some seed data into our database. In this post we will be working with our new database and seed data. If you want to participate, make sure to follow the steps in the first post. We’ve been taking a minimal approach so far by using only wrangler and sql scripts for our workflow. The D1 Client API has a small surface area. Thanks to the power of SQL, we will have everything we need to construct all types of queries. Before we start writing our queries, let's touch on some important concepts. Prepared statements and parameter binding This is the first section of the docs and it highlights two different ways to write our SQL statements using the client API: prepared and static statements. Best practice is to use prepared statements because they are more performant and prevent SQL injection attacks. So we will write our queries using prepared statements. We need to use parameter binding to build our queries with prepared statements. This is pretty straightforward and there are two variations. By default we add ? ’s to our statement to represent a value to be filled in. The bind method will bind the parameters to each question mark by their index. The first ? is tied to the first parameter in bind, 2nd, etc. I would stick with this most of the time to avoid any confusion. ` I like this second method less as it feels like something I can imagine messing up very innocently. You can add a number directly after a question mark to indicate which number parameter it should be bound to. In this exampl, we reverse the previous binding. ` Reusing prepared statements If we take the first example above and not bind any values we have a statement that can be reused: ` Querying For the purposes of this post we will just build example queries by writing them out directly in our Worker fetch handler. If you are building an app I would recommend building functions or some other abstraction around your queries. select queries Let's write our first query against our data set to get our feet wet. Here’s the initial worker code and a query for all authors: ` We pass our SQL statement into prepare and use the all method to get all the rows. Notice that we are able to pass our types to a generic parameter in all. This allows us to get a fully typed response from our query. We can run our worker with npm run dev and access it at http://localhost:8787 by default. We’ll keep this simple workflow of writing queries and passing them as a json response for inspection in the browser. Opening the page we get our author results. joins Not using an ORM means we have full control over our own destiny. Like anything else though, this has tradeoffs. Let’s look at a query to fetch the list of posts that includes author and tags information. ` Let’s walk through each part of the query and highlight some pros and cons. ` * The query selects all columns from the posts table. * It also selects the name column from the authors table and renames it to author_name. * It aggregates the name column from the tags table into a JSON array. If there are no tags, it returns an empty JSON array. This aggregated result is renamed to tags. ` * The query starts by selecting data from the posts table. * It then joins the authors table to include author information for each post, matching posts to authors using the author_id column in posts and the id column in authors. * Next, it left joins the posts_tags table to include tag associations for each post, ensuring that all posts are included even if they have no tags. * Next, it left joins the tags table to include tag names, matching tags to posts using the tag_id column in posts_tags and the id column in tags. * Finally, group the results by the post id so that all rows with the same post id are combined in a single row SQL provides a lot of power to query our data in interesting ways. JOIN ’s will typically be more performant than performing additional queries.You could just as easily write a simpler version of this query that uses subqueries to fetch post tags and join all the data by hand with JavaScript. This is the nice thing about writing SQL, you’re free to fetch and handle your data how you please. Our results should look similar to this: ` This brings us to our next topic. Marshaling / coercing result data A couple of things we notice about the format of the result data our query provides: Rows are flat. We join the author directly onto the post and prefix its column names with author. ` Using an ORM we might get the data back as a child object: ` Another thing is that our tags data is a JSON string and not a JavaScript array. This means that we will need to parse it ourselves. ` This isn’t the end of the world but it is some more work on our end to coerce the result data into the format that we actually want. This problem is handled in most ORM’s and is their main selling point in my opinion. insert / update / delete Next, let’s write a function that will add a new post to our database. ` There’s a few queries involved in our create post function: * first we create the new post * next we run through the tags and either create or return an existing tag * finally, we add entries to our post_tags join table to associate our new post with the tags assigned We can test our new function by providing post content in query params on our index page and formatting them for our function. ` I gave it a run like this: http://localhost:8787authorId=1&tags=Food%2CReview&title=A+review+of+my+favorite+Italian+restaurant&content=I+got+the+sausage+orchette+and+it+was+amazing.+I+wish+that+instead+of+baby+broccoli+they+used+rapini.+Otherwise+it+was+a+perfect+dish+and+the+vibes+were+great And got a new post with the id 11. UPDATE and DELETE operations are pretty similar to what we’ve seen so far. Most complexity in your queries will be similar to what we’ve seen in the posts query where we want to JOIN or GROUP BY data in various ways. To update the post we can write a query that looks like this: ` COALESCE acts similarly to if we had written a ?? b in JavaScript. If the binded value that we provide is null it will fall back to the default. We can delete our new post with a simple DELETE query: ` Transactions / Batching One thing to note with D1 is that I don’t think the traditional style of SQLite transactions are supported. You can use the db.batch API to achieve similar functionality though. According to the docs: Batched statements are SQL transactions ↗. If a statement in the sequence fails, then an error is returned for that specific statement, and it aborts or rolls back the entire sequence. ` Summary In this post, we've taken a hands-on approach to exploring the D1 Client API, starting with defining our database schema and loading seed data. We then dove into writing queries, covering the basics of prepared statements and parameter binding, before moving on to more complex topics like joins and transactions. We saw how to construct and execute queries to fetch data from our database, including how to handle relationships between tables and marshal result data into a usable format. We also touched on inserting, updating, and deleting data, and how to use transactions to ensure data consistency. By working through these examples, we've gained a solid understanding of how to use the D1 Client API to interact with our database and build robust, data-driven applications....

Dec 23, 2024

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How to Truncate Strings Easily with CSS

You'll often need to truncate text when working with user interfaces, especially when displaying content within a limited space. CSS provides a straightforward way to handle this scenario, ensuring that long text strings are cut off gracefully without affecting the overall layout. CSS Truncation Techniques Single-Line Truncation If you want to truncate a single line of text, CSS provides a simple solution. The key properties to use here are overflow, white-space, and text-overflow. ` Explanation of properties: * white-space: nowrap: This ensures the text stays on a single line, preventing wrapping. * overflow: hidden: This hides any content that overflows the container. * text-overflow: ellipsis: This adds the ellipsis (…) at the end of the truncated text. Multi-Line Truncation While truncating a single line of text is common, sometimes you may want to display multiple lines but still cut off the text when it exceeds a certain number of lines. You can use a combination of CSS properties such as -webkit-line-clamp along with the display and overflow properties. ` Live example: Explanation of properties: * display: -webkit-box: This is a legacy flexbox-like display property that works with the -webkit-line-clamp property. * -webkit-line-clamp: Specifies the number of lines to show before truncating. * -webkit-box-orient: vertical: Ensures the box is laid out vertically for proper multi-line truncation. * overflow: hidden: Prevents content overflow. * text-overflow: ellipsis: Adds an ellipsis after the truncated content. Why Use CSS for Text Truncation Over JavaScript Techniques? While it’s possible to truncate text using JavaScript, CSS is often a better choice for this task for several reasons. Let's explore why CSS-based truncation techniques are generally preferred over JavaScript. Performance Efficiency CSS operates directly within the browser's layout engine, meaning it doesn’t require additional processing or event handling as JavaScript does. When using JavaScript to truncate text, the script needs to run on page load (or after DOM manipulation), and sometimes, it needs to listen for events such as window resizing to adjust truncation. This can introduce unnecessary overhead, especially in complex or resource-constrained environments like mobile devices. CSS, on the other hand, is declarative. Once applied, it allows the browser to handle text rendering without any further execution or processing. This leads to faster load times and a smoother user experience. Simplicity and Maintainability CSS solutions are much simpler to implement and maintain than their JavaScript counterparts. All it takes is a few lines of CSS to implement truncation. In contrast, a JavaScript solution would require you to write and maintain a function that manually trims strings, inserts ellipses, and re-adjusts the text whenever the window is resized. Here's the JavaScript Truncation Example to compare the complexity: JavaScript Truncation Example: ` At the example above, we truncated the text to 50 characters which may be 1 line on large screens and 6 lines on mobile and in that case we will need to add more code to truncate it responsively. As you can see, the CSS solution we used earlier is more concise and readable, whereas the JavaScript version is more verbose and requires managing the string length manually. Responsiveness Without Extra Code With CSS, truncation can adapt automatically to different screen sizes and layouts. You can use relative units (like percentages or vw/vh), media queries, or flexbox/grid properties to ensure the text truncates appropriately in various contexts. If you were using JavaScript, you’d need to write additional logic to detect changes in the viewport size and update the truncation manually. This would likely involve adding event listeners for window resize events, which can degrade performance and lead to more complex code. CSS Example for Responsive Truncation: ` To achieve this in JavaScript, you’d need to add more code to handle the width adjustments dynamically, making it more complex to maintain and troubleshoot. Separation of Concerns CSS handles the presentation layer of your website, while JavaScript should focus on dynamic functionality or data manipulation. By keeping truncation logic within your CSS, you're adhering to the principle of separation of concerns, where each layer of your web application has a clear, well-defined role. Using JavaScript for visual tasks like truncation mixes these concerns, making your codebase harder to maintain, debug, and scale. CSS is purpose-built for layout and visual control, and truncation is naturally a part of that domain. Browser Support and Cross-Browser Consistency Modern CSS properties like text-overflow and -webkit-line-clamp are widely supported across all major browsers. This means that CSS solutions for truncation are generally consistent and reliable. JavaScript solutions, on the other hand, may behave differently depending on the browser environment and require additional testing and handling for cross-browser compatibility. While older browsers may not support specific CSS truncation techniques (e.g., multi-line truncation), fallback options (like single-line truncation) can be easily managed through CSS alone. With JavaScript, more complex logic might be required to handle such situations. Reduced Risk of Layout Shifting JavaScript-based text truncation risks causing layout shifting, especially during initial page loads or window resizes. The browser may need to recalculate the layout multiple times, leading to content flashing or jumpy behavior as text truncation is applied. CSS-based truncation is applied as part of the browser’s natural rendering flow, eliminating this risk and ensuring a smoother experience for the user. Conclusion CSS is the optimal solution for truncating text in most cases due to its simplicity, efficiency, and responsiveness. It leverages the power of the browser’s rendering engine, avoids the overhead of JavaScript, and keeps your code clean and maintainable. While JavaScript truncation has its use cases, CSS should always be your go-to solution for truncating strings, especially in static or predictable layouts. If you like this post, check out the other CSS posts on our blog!...

Sep 13, 2024

4 mins

CSS

“Music and code have a lot in common,” freeCodeCamp’s Jessica Wilkins on what the tech community is doing right to onboard new software engineers

Before she was a software developer at freeCodeCamp, Jessica Wilkins was a classically trained clarinetist performing across the country. Her days were filled with rehearsals, concerts, and teaching, and she hadn’t considered a tech career until the world changed in 2020. > “When the pandemic hit, most of my gigs were canceled,” she says. “I suddenly had time on my hands and an idea for a site I wanted to build.” That site, a tribute to Black musicians in classical and jazz music, turned into much more than a personal project. It opened the door to a whole new career where her creative instincts and curiosity could thrive just as much as they had in music. Now at freeCodeCamp, Jessica maintains and develops the very JavaScript curriculum that has helped her and millions of developers around the world. We spoke with Jessica about her advice for JavaScript learners, why musicians make great developers, and how inclusive communities are helping more women thrive in tech. Jessica’s Top 3 JavaScript Skill Picks for 2025 If you ask Jessica what it takes to succeed as a JavaScript developer in 2025, she won’t point you straight to the newest library or trend. Instead, she lists three skills that sound simple, but take real time to build: > “Learning how to ask questions and research when you get stuck. Learning how to read error messages. And having a strong foundation in the fundamentals” She says those skills don’t come from shortcuts or shiny tools. They come from building. > “Start with small projects and keep building,” she says. “Books like You Don’t Know JS help you understand the theory, but experience comes from writing and shipping code. You learn a lot by doing.” And don’t forget the people around you. > “Meetups and conferences are amazing,” she adds. “You’ll pick up things faster, get feedback, and make friends who are learning alongside you.” Why So Many Musicians End Up in Tech A musical past like Jessica’s isn’t unheard of in the JavaScript industry. In fact, she’s noticed a surprising number of musicians making the leap into software. > “I think it’s because music and code have a lot in common,” she says. “They both require creativity, pattern recognition, problem-solving… and you can really get into flow when you’re deep in either one.” That crossover between artistry and logic feels like home to people who’ve lived in both worlds. What the Tech Community Is Getting Right Jessica has seen both the challenges and the wins when it comes to supporting women in tech. > “There’s still a lot of toxicity in some corners,” she says. “But the communities that are doing it right—like Women Who Code, Women in Tech, and Virtual Coffee—create safe, supportive spaces to grow and share experiences.” She believes those spaces aren’t just helpful, but they’re essential. > “Having a network makes a huge difference, especially early in your career.” What’s Next for Jessica Wilkins? With a catalog of published articles, open-source projects under her belt, and a growing audience of devs following her journey, Jessica is just getting started. She’s still writing. Still mentoring. Still building. And still proving that creativity doesn’t stop at the orchestra pit—it just finds a new stage. Follow Jessica Wilkins on X and Linkedin to keep up with her work in tech, her musical roots, and whatever she’s building next. Sticker illustration by Jacob Ashley....

Apr 25, 2025

3 mins

JavaScriptSoftware Engineering

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Bun v1.0

Why a new JS runtime

Zig programming language

Developer Experience

Bun Native APIs

Plugin system

Conclusion

Mark Shenouda

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