JSJ 336: “The Origin of ESLint” with Nicholas Zakas

JSJ 336: “The Origin of ESLint” with Nicholas Zakas

Panel: Special Guests: Nicholas Zakas In this episode, the panel talks with Nicholas Zakas who writes on his site, Human Who Codes. He is the creator of ESLint, also the author of several books, and he blogs, too. He was employed through Box and today he talks about ESLint in full detail! Check it out! Show Topics:0:05 – Advertisement: KENDO UI 0:37 – Hello! The panel is...(Chuck introduces everyone).1:04 – Nicholas who are you?1:17 – Nicholas: Yeah it’s been about 5 years and then you invited me again, but I couldn’t come on to talk about ESLint back then. That’s probably what people know me most for at this point. I created ESLint and I kicked that off and now a great team of people is maintaining it.1:58 – Chuck: What is it?2:04 – It’s a Linter for JavaScript. It falls into the same category as JSLint. The purpose of ESLint is to help you find problems with your code. It has grown quite a bit since I’ve created it. It can help with bugs and enforcing style guides and other things.2:53 – Where did it come from?2:57 – Guest: The idea popped into my head when I worked at Pop. One of my teammates was working on a bug and at that time we were using...Nothing was working and after investigating someone had written a JavaScript code that was using a native code to make an Ajax request. It wasn’t the best practice for the company at the time. For whatever reason the person was unaware of that. When using that native XML...there was a little bit of trickiness to it because it was a wrapper around the...We used a library to work around those situations and add a line (a Linter) for all JavaScript files. It was a text file and when you tried to render code through the process it would run and run the normal expression and it would fail if any of the...matched.I am not comfortable using normal expressions to write code for this. You could be matching in side of a string and it’s not a good way to be checking code for problems. I wanted to find a better way.6:04 – Why did you choose to create a product vs. using other options out there?6:15 – Guest: Both of those weren’t around. JSHint was pretty much the defector tool that everyone was using. My first thought was if JSHint could help with this problem?I went back to look at JSHint and I saw that on their roadmap you could create your own rules, and I thought that’s what we need. Why would I build something new? I didn’t see anything on GitHub and didn’t see the status of that. I wanted to see what the plan was, and they weren’t going to get to it. I said that I really needed this tool and I thought it would be helpful to others, too.8:04 – My history was only back when it was customizable.8:13 – Aimee: It’s interesting to see that they are basing it on regular expressions.8:32 – Guest: Interesting thing at Box was that there was...I am not sure but one of the engineers at Box wrote...9:03 – Aimee: I was going to ask in your opinion what do you think ES Lint is the standard now?9:16 – Guest: How easy it is to plug things in. That was always my goal because I wanted the tool not to be boxed in – in anyway.The guest continues to talk about how pluggable ESLint is and the other features of this tool.13:41 – One thing I like about ESLint is that it can be an educational tool for a team. Did you see that being an educational tool?14:24 – Guest: How do you start introducing new things to a team that is running at full capacity? That is something that I’ve wondered throughout my career. As a result of that, I found that a new team there were some problems I the code base that were really hard to get resolved, because when one person recognizes it there isn’t a god way to share that information within a team in a non-confrontational way. It’s better to get angry at a tool rather than a person.Guest goes into what this can teach people.18:07 – Panelist: I am not surprised. Is there a best practice to get a team to start with ESLint?Do you get the whole team in a room and show them the options or take the best guess and turn it on?18:34 – Guest: The thing I recommend is that first and foremost get ESLint in your system with zero rules on. It starts that mindset into your development process. We can do something to automatically check...Get Syntax checking and you will se improvements on the number of bugs that are getting out of production. I recommend using the default the ESLint configuration. This has all of the things that we have found that are most likely errors and runtime errors vs. syntax errors. You can go through with those and sometimes it is easier to run that check with...Using those ESLint rules will clean up a lot of problems that you didn’t know you had with your code. There are too many problems with those rules. I recommend instead of turning them off then put the severity to warning and not error. That is something we started with in the beginning. We turned on as many rules as we could and it drove people crazy. They didn’t feel like when they were committing to a file why should I be...The idea with the different scenario levels you don’t’ want to turn off rules so people don’t know there is a problem. There can be a rule on so people will know that there is a problem, but...Doing that alone will give you a lot of benefit in using ESLint. How do you decide as a team on the rules that are maybe not for finding errors but for stylistic in error? Do we use four spaces, semi-colons, etc. To figure that out I am a big component on finding a pre-existing style guide and adapting it. Get everyone to agree.There is no right or wrong when it comes to stylistic preferences. It really is just getting everyone to do the same thing. I think it was Crawford that said: Whether you drive on the right side of the left side of the road – it doesn’t matter as long as everyone is dong the same thing. I agree with that and it applies to style guides. It can get heated but for the best thing for the team is stick with a guide and work together.24:36 – Aimee: I can go through the options to pick one of the style guides out there and then it will automatically create my configuration for me is helpful. Question: If you had to pick 2 or 3 rules that you are super helpful what would they be?25:30 – Guest: To touch briefly on indentation. Whether you like four spaces or whether you are wild and like tabs, I think the indent rule is very helpful. Just for wiping out and eliminating that discussion through your team. Have your editor setup however they want but on the pre-hook...But my favorite rules I tend to lean towards the ones that saved me.The Guest goes through his favorite rules with ESLint. Check it out!26:51 – Guest mentions his second favorite rule, here!28:24 – Guest mentions his third favorite rule, here!29:03 – Guest mentions the rule that makes him giggle a lot, here!30:07 – Advertisement – Sentry! 31:22 – What is your take on running Fix? Does it make sense to run Fix?32:00 – Guest: It depends and the idea behind Fix is the idea of doing a one time (at the start) fix everything that it can find wrong b/c I don’t want to do it by hand. It morphed into a more of a tool that people are using all the time. I too have mixed feelings about it. I think the greatest value you get out of Fix is that when you first install it or when you enable a new rule. I think in those situations you get a lot of value out of Fix. I think that when people were getting aggressive with their code styles it took us down a path where we...As a pre-commit hook it could be to fix things and part of the built system you wouldn’t want...People are probably wondering: Why doesn’t ESLint doesn’t fix all the time?It can be a team decision: do you want to run Fix at the point that the developer is writing the code, do you want to use Fix as running it as a build when you are bundling? It really seems more of a personal preference. I am on the fence about it. Even though I am leaning more towards...35:16 – Do you run Premier?35:20 – Guest: No I don’t. I don’t have anything against Premier but I think Prettier uses a very interesting space.37:50 – Chuck: What is next for ESLint and what is next for you?37:55 – Guest: Well, to be honest I am not sure what is next for ESLint. I haven’t been involved with keeping it maintained for the last few years. I do help out with feedback with decisions. But in general the ESLint the direction is that let’s add tings that help people avoid language hazards and make sure that ESLint is still pluggable. Lastly, that we will be there to help people and the community. There is this virtuosic cycle and tools like Babble and then tools like ESLint introducing rules adapting new rules and featur

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Speaking Up: The Developer’s Guide to Conference Talks & Career Growth - JSJ 682

Speaking Up: The Developer’s Guide to Conference Talks & Career Growth - JSJ 682

In this episode of JavaScript Jabber, I am joined by three incredible guests — Ariel Shulman, Liad Yosef, and Evyatar Alush — to dive into the world of public speaking in tech. From the jitters of their first talk to the professional and personal growth that comes with hitting the stage, we unpack the full journey of becoming a tech speaker. Whether you're just curious about getting started or want to sharpen your presentation game, this episode is packed with real talk and insights from experienced voices in the community.We get personal about the why, the how, and the what next of conference speaking — covering the motivations, the process of getting accepted, tips for preparing standout talks, and even how public speaking can open doors to career-changing opportunities. If you've ever wondered what it really takes to be heard on stage, this conversation might just be your launchpad.🔗 Links & ResourcesReact Next ConferenceNo TLB ConferenceJS Heroes RomaniaSessionize - CFP platformReversim Tech ConferenceReact SummitGitNation ConferencesBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

10 Juli 1h 44min

How Holepunch Is Redefining Peer-to-Peer Apps with Bare.js — A New Era for JavaScript Developers -JSJ 681

How Holepunch Is Redefining Peer-to-Peer Apps with Bare.js — A New Era for JavaScript Developers -JSJ 681

In this episode, we sit down with Mathias Madsen, CEO of Holepunch, and take a wild ride through the cutting edge of peer-to-peer JavaScript development. Mathias shares his journey from accidentally discovering JavaScript in college to becoming a prolific contributor with over 1,500 open source modules. His passion? Building decentralized, peer-to-peer systems where JavaScript isn’t just for the browser—it powers the entire stack.We dive deep into how Holepunch is reimagining application distribution with their Pear system —essentially turning peer-to-peer into a first-class citizen for distributing full applications, not just files. No hosting, no servers — just apps shared directly, BitTorrent-style. And because packaging and distributing Node-based apps can be painfully complex, they took things a step further by building a new runtime: Bare.jsBare.js is refreshingly "bare": it strips away the heavy, opinionated APIs bundled into Node or Deno, leaving just the JavaScript core and a powerful module system. What’s revolutionary here is Bare's ability to run the same codebase across desktop, mobile, and even tiny embedded devices—swapping out engines like V8, JavaScriptCore, or JerryScript depending on the platform's needs. This allows Mathias' team to write backend logic once, share it across all platforms, and iterate at lightning speed.Key takeaways:-Peer-to-peer can go far beyond media sharing — it's being used for full app distribution.-Bare.js decouples JavaScript from specific platforms, creating a universal backend that just works anywhere.-Modular design isn't just a philosophy — it's the secret to Holepunch’s rapid development pace.-The combination of React Native for UI and Bare.js for backend creates an insanely productive development pipeline, fully cross-platform.If you’re into JavaScript, peer-to-peer tech, or just love hearing about developers breaking the mold, this one’s for you.About the GuestMathias is the CEO of Holepunch (https://holepunch.to/). He brings his passion for open-source software, and deep experience in the area, having  published more than 1000 modules to npm, the Node.js package manager, totaling billions of downloads every month.Mathias Buus is a self taught Javascript hacker from Copenhagen. He works full time on open source projects and has been working with Node.js since the 0.2 days. Mathias likes to work with P2P and distributed systems and is the author of more than 550 modules on npm, including some of the most popular ones for working with streams. In addition he has spoken about mad science projects at various conferences around the world.Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

24 Juni 1h 6min

Migrating a Legacy JavaScript Codebase to TypeScript - JSJ 680

Migrating a Legacy JavaScript Codebase to TypeScript - JSJ 680

In this episode, Dan and I (Steve) dove deep into what turned out to be a surprisingly complex, yet incredibly insightful topic: gradually migrating a massive legacy JavaScript project over to TypeScript. We're talking about nearly 1,000 JS files, 70,000+ lines of code, and years of developer history—all transitioning carefully to a typed, modern future.Dan walked us through how he started by setting up the project for success before converting even one file—getting CI/CD ready, setting up tsconfig.json, sorting out test dependencies, dealing with mock leaks, and even grappling with quirks between VS Code and WebStorm debugging.We talked tools (like TS-ESLint, concurrently, and ts-node), why strict typing actually uncovered real bugs (and made the code better!), and why it’s crucial not to touch any .js files until your TypeScript setup is rock solid.Key Takeaways:Gradual migration is 100% possible—and often better—than ripping the bandaid off.TypeScript can and will catch bugs hiding in your JavaScript. Be prepared!Use VS Code extensions or TS-Node to support your devs’ tooling preferences.Don't underestimate the setup phase—it’s the foundation of long-term success.Start small: Dan's team converted just one file at first to test the whole pipeline.If you’re sitting on a legacy JS project and dreaming of TypeScript, this episode is your blueprint—and your warning sign.Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

5 Juni 1h 25min

TypeScript, Security, and Type Juggling with Ariel Shulman & Liran Tal - JSJ 679

TypeScript, Security, and Type Juggling with Ariel Shulman & Liran Tal - JSJ 679

In this episode, we dove headfirst into the swirling waters of TypeScript, its real-world use cases, and where it starts to fall short—especially when it comes to security. Joining us from sunny Tel Aviv (and a slightly cooler Portland), we had the brilliant Ariel Shulman and security advocate Liran Tal bring the heat on everything from type safety to runtime vulnerabilities.We started off with a friendly debate: Has TypeScript really taken over the world? Our verdict? Pretty much. Whether it’s starter projects, enterprise codebases, or AI-generated snippets, TypeScript has become the de facto standard. But as we quickly found out, that doesn’t mean it’s perfect.Key Takeaways:-TypeScript ≠ SecurityWe tend to trust TypeScript a bit too much. It’s a build-time tool, not a runtime enforcer. As Liran pointed out, “TypeScript is not a security tool,” and treating it like one leads to dangerous assumptions.-Type Juggling is Real (and Sneaky)We explored how something as innocent as using as string on request data can open the door to vulnerabilities like HTTP parameter pollution and prototype pollution. Just because your IDE is happy doesn’t mean your runtime is.-Enter Zod – Runtime Type Checking to the Rescue?Zod got some love for bridging the dev-time/runtime gap by validating data on the fly and inferring TypeScript types. But even Zod isn’t foolproof. For example, unless you're using .strict(), extra fields can sneak past your validations, leading to mass assignment bugs.-Common Developer FallaciesWe discussed the misplaced confidence developers have in things like code coverage and TypeScript alone. One of the big takeaways: defense in depth matters. Just like testing, layering your security practices (like using Zod, type guards, and proper sanitization) is key.-TypeScript Best Practices Are EvolvingFrom discriminated unions to avoiding any, from using Maps over plain objects to prevent prototype pollution—TypeScript developers are adapting. And tools like modern Node.js now support type stripping, which makes working with .ts files at runtime a bit easier.Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

29 Maj 1h 32min

Building Agentic AI Workflows with Matthew Henage - JSJ 678

Building Agentic AI Workflows with Matthew Henage - JSJ 678

In this episode, we sat down with full-stack developer and AI innovator Matthew Henage, creator of WAOS.ai (Web App Operating System) and the incredible storytelling platform SpeakMagic.ai. This conversation took us deep into the world of agentic AI, low-code app building, and the future of intelligent workflows.We kicked things off with Matthew sharing how he’s been riding the AI wave since GPT-3.5 blew his mind. His platform WoWs is all about making it easy for developers to build powerful web apps with embedded AI workflows — think of it like Zapier meets ChatGPT, but with agents working together instead of API chains.One of the most eye-opening parts of our chat was learning about agent swarms — essentially teams of specialized AI agents that collaborate to perform complex tasks. Instead of relying on one giant AI brain to do everything, you create smaller, purpose-built AIs that handle specific steps in a workflow. It’s scalable, smarter, and kind of like assembling your dream dev team… but all made of code.Matthew’s Speak Magic project is a jaw-dropper. It uses a swarm of over 40 agents to turn a single story idea into a fully animated, two-minute video — complete with scenes, scripts, character animations, music, and more. It’s AI storytelling on steroids.We also talked a lot about:Best practices for building reliable AI workflowsThe importance of keeping context windows small (under 4,000 tokens works best!)How prompt engineering is becoming the new programmingUsing AI for vibe coding (yes, that’s a thing) and rapid prototypingThe tradeoffs between using traditional programming vs. letting AI handle logicEthical considerations and how to handle memory and privacy in long-running user interactionsCheck out Matthew’s work at WAOS.ai and speakmagic.ai — and as always, stay curious and keep building!Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

22 Maj 1h 3min

Reinventing Web Development with Brisa: A Conversation with Aral Roca - JSJ 677

Reinventing Web Development with Brisa: A Conversation with Aral Roca - JSJ 677

In this week’s episode, it’s just me — Charles Max Wood — and I’m joined by the incredibly sharp and open-source-loving Aral Roca, direct from Barcelona! Aral’s the creator of Brisa, a new full-stack web framework that flips the script on how we build modern web apps. If you thought the "another day, another framework" meme was played out... well, Brisa might just change your mind.Key Takeaways:-Brisa’s Big Idea: It's designed to let you build web apps with minimal or zero JavaScript on the client side. Think HTML streaming, server actions, and components that render server-side first, but can gradually hydrate on the client.-Server-first FTW: Aral walks us through how Brisa handles server actions — even capturing click and scroll events on the server — using ideas inspired by HTMX, LiveView, and server components from frameworks like Next.js.-Tiny and Mighty: The whole framework is incredibly lightweight. Web components come in at just ~3 KB, and the built-in i18n system is under 1 KB!-From Idea to Reality: Aral started Brisa to scratch his own itch — building side projects and blogs without bloated front-end code. But now, others are using it too (yes, even in production!), including one travel agency that's gone all-in.-Multi-platform Future: Brisa has adapters in the works for Vercel, Node, and Deno — plus integration with Tauri for building native Android, iOS, and desktop apps from the same codebase.-What's Coming: Roadmap goals include improved hot reloads, more adapters, transitions, lazy-loaded components, and a better playground for developers to tinker with.Oh, and yes — Aral does parkour. For real.This episode is packed with deep technical insight and exciting potential for a new way to build web apps — especially for devs who love fast performance, server-rendering, and clean architecture.Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

15 Maj 1h 5min

Building Enterprise Infrastructure with Bit & AI with Gilad Shoham - JSJ 676

Building Enterprise Infrastructure with Bit & AI with Gilad Shoham - JSJ 676

In this episode, I (Steve Edwards) flew solo on the mic but had the pleasure of hosting a truly insightful conversation with Gilad Shoham, VP of Engineering at Bit.Cloud. Gilad brought the heat from Israel as we explored how Bit is revolutionizing enterprise software architecture—and how AI is being layered on top to supercharge developer productivity.We started by breaking down Bit’s core platform, which helps teams compose applications from reusable, independently versioned components. Think Lego blocks, but for your codebase. It’s all about boosting dev velocity, reducing duplication, and making collaboration across teams more seamless.Gilad walked us through some jaw-dropping features: versioning without Git, deep component CI pipelines, and even Bit’s ability to replace monolithic repositories with a graph of decoupled components. Everything is Node + TypeScript under the hood, and while it’s currently JS-focused, the ambition is clearly broader.Then came the big twist: AI. Bit is now leveraging AI not to just write code, but to compose it using existing components. Instead of bloating your codebase with endless variations of the same button, Bit’s AI understands your graph and builds features by intelligently reusing what’s already there. It’s like Copilot with a memory—and architectural sense.Key takeaways:Bit components wrap your existing code (like React/Vue) with metadata, testing, and versioning.Their infrastructure makes it possible to build and test components independently and in parallel.The AI strategy is reuse-first: generate only when needed, always compose from what already exists.Even massive enterprise codebases can gradually migrate to Bit without a full rewrite.Expect a human-in-the-loop process, but with most of the heavy lifting handled by AI.Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

8 Maj 58min

Replacing Create React App: Why Create TS Router App Is the Future of React Development - JSJ 675

Replacing Create React App: Why Create TS Router App Is the Future of React Development - JSJ 675

We’ve been diving into the evolving landscape of React app development and why tools like Create TS Router App (CTA) are stepping up to fill the gap left by the deprecation of Create React App (CRA). What we’ve learned is that SSR (server-side rendering) isn’t one-size-fits-all—e-commerce sites need it for SEO and performance, but internal tools and dashboards often don’t. That’s where CTA shines. It gives us a fast, modern, Vite-powered setup with TanStack Router built in, so we can start small and scale up without committing to heavy frameworks like Next.js from day one.What we love about CTA is how it keeps things familiar (same structure as CRA) while giving us type safety, file-based routing, and the flexibility to add only the features we need—like Clerk, Sentry, or even SolidJS support. Whether we’re building a simple prototype or a full-featured app, CTA makes the experience smoother, more intuitive, and future-friendly.Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

2 Maj 1h 30min

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