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[Other] Show HN: Regolith – Regex library that prevents ReDoS CVEs in TypeScript I wanted a safer alternative to RegExp for TypeScript that uses a linear-time engine, so I built Regolith.<p>Why: Many CVEs happen because TypeScript libraries are vulnerable to Regular Expression Denial of Service attacks. I learned about this problem while doing undergraduate research and found that languages like Rust have built-in protection but languages like JavaScript, TypeScript, and Python do not. This library attempts to mitigate these vulnerabilities for TypeScript and JavaScript.<p>How: Regolith uses Rust&#x27;s Regex library under the hood to prevent ReDoS attacks. The Rust Regex library implements a linear-time Regex engine that guarantees linear complexity for execution. A ReDoS attack occurs when a malicious input is provided that causes a normal Regex engine to check for a matching string in too many overlapping configurations. This causes the engine to take an extremely long time to compute the Regex, which could cause latency or downtime for a service. By designing the engine to take at most a linear amount of time, we can prevent these attacks at the library level and have software inherit these safety properties.<p>I&#x27;m really fascinated by making programming languages safer and I would love to hear any feedback on how to improve this project. I&#x27;ll try to answer all questions posted in the comments.<p>Thanks! - Jake Roggenbuck

[Other] GNU Artanis – A fast web application framework for Scheme

[IDE/Editor] Show HN: First background agents in Jetbrains IDEs [video] TLDR: made the first background coding agent that has an isolated workspace and runs locally<p>Howdy - I’m Kevin, co-founder of Firebender, and we built the first background coding agent in android studio &#x2F; Jetbrains!<p>Why not just use Cursor background agents or OpenAI Codex?<p>Both of these require setting up a cloud container and cloning your existing developer environment, and maintaining it. Then when you want to iterate on changes as AI inevitably makes a mistake, you either throw away the work, or have to pull down the branch and clean it up. This feels really clunky. With Firebender, background agents run locally in a lightweight git worktree&#x2F;IDE tab. This means when the agent is done, you can easily clean up the changes and run code with a few clicks.<p>Under the hood, the agent behaves similarly to claude code (didn’t want to reinvent the wheel), but also leverages all of the hooks into IntelliJ sdk like go-to-definition, find usages, auto-imports for accuracy, and it gives a cleaner visual UI for reviewing changes and merging them. You can use any frontier model like gpt-5&#x2F;sonnet-4 as the base.<p>We’ve had to do quite a bit of reverse engineering of the IntelliJ codebase to cleanly set up and manage the isolated environment, and I think you’ll appreciate the simple UX of hitting cmd+enter to run a background agent anywhere.<p>get started docs: <a href="https:&#x2F;&#x2F;docs.firebender.com&#x2F;get-started&#x2F;background-agents">https:&#x2F;&#x2F;docs.firebender.com&#x2F;get-started&#x2F;background-agents</a><p>download the plugin: <a href="https:&#x2F;&#x2F;firebender.com">https:&#x2F;&#x2F;firebender.com</a><p>Would love to get your feedback to help us improve the tool for you! Thanks!

[Code Quality] Show HN: Framework to create linters for Python, YAML, TOML, JSON Hi, this is a Python framework I have created to make my life a little easier when creating custom linting rules.<p>Key features:<p>- Quick to use (~20 LOC to create a functioning linter&#x2F;checker)<p>- Works with different file formats (as in the description)<p>- Supports multiple ignore&#x2F;noqa directives (per-line ignores, range ignores, whole file, rules choice during runs)<p>- Single check can span all elements of the file or even all files<p>- Works directly with Python&#x27;s AST<p>- Tutorials and API reference to make users life easier<p>All in all seems to be quite functional for my private (yet) linters, so I decided to make it into a FOSS project.<p>Have fun, would love to hear your feedback and ideas regarding it!

[Other] Show HN: My OSS P2P file transfer tool for learning Next.js (as a C++ dev) Hey HN,<p>I&#x27;m a C++ algorithms engineer, and today I&#x27;d like to share my first full-stack web project: PrivyDrop.<p>This project was born from two ideas:<p>First, I wanted to solve a daily annoyance of mine: I needed a simple, AirDrop-like way to send text, links, or screenshots between my phone and PC. I tried many tools, but they either required me to sign up, had various limitations, or uploaded my data to their servers, which I was never comfortable with.<p>Second, this was a personal experiment. Last year, with all the talk about &quot;AI replacing programmers,&quot; I got curious. As a developer with no web background, I wanted to see how long it would take to learn full-stack development from scratch (an area I&#x27;m really interested in) and build a complete application, using AI as my primary coding partner and mentor.<p>PrivyDrop is the result of that learning and experiment.<p>It&#x27;s a peer-to-peer (P2P) file-sharing tool based on WebRTC. Its core principle is that *your data belongs only to you*: all files and text are transferred directly between your browser and the recipient&#x27;s, fully end-to-end encrypted, without ever passing through an intermediate server.<p>*Here are some of its key features:*<p>* Completely free and open-source, with no ads. * No sign-up or installation required—just open your browser. * Direct P2P connection for privacy, security, and speed. * No limits on file size or type. * Support for entire folder transfers. * Built-in resumable transfers.<p>The whole process has been a fantastic learning journey. I&#x27;m sharing it now in the hope that it can solve the same pain point for others. I&#x27;m really eager to hear any feedback, ideas, or even harsh criticism from the HN community!<p>* *Live Demo:* <a href="https:&#x2F;&#x2F;www.privydrop.app" rel="nofollow">https:&#x2F;&#x2F;www.privydrop.app</a> * *GitHub Repo:* <a href="https:&#x2F;&#x2F;github.com&#x2F;david-bai00&#x2F;PrivyDrop" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;david-bai00&#x2F;PrivyDrop</a><p>Thanks, everyone!

[Other] Show HN: Rebuilding GPT2 inference in ~500 lines of (commented) code

[API/SDK] Show HN: Mixing Deterministic Codegen with LLM Codegen for Client SDKs Hi HN, I’m Patrick. Elias, Kevin, and I are building Sideko (<a href="https:&#x2F;&#x2F;sideko.dev" rel="nofollow">https:&#x2F;&#x2F;sideko.dev</a>), a new type of code generator for building and maintaining API client SDKs from OpenAPI specs.<p>Our approach differs significantly from traditional SDK generators in that we use structured pattern matching queries to create and update the code. Other SDK generators use templates, which overwrite custom changes and produce code that looks machine generated.<p>We’ve mixed in LLM codegen by creating this workflow: Run deterministic codegen to establish the SDK structure. Let LLMs enhance specific components where adaptability adds value and include agent rules files that enforce consistency and correctness with type checking and integration tests against mock servers. The system will retain the LLM edits, while the rest of the SDK is automatically maintained by the deterministic generator (keeping it in sync with the API). LLMs can edit most the files (see python rules and typescript rules).<p>You can try it out from your terminal: Install: npm install -g @sideko&#x2F;cli Login: sideko login Initialize: sideko sdk init Prompt: “Add a new function that…”<p>Check out the repo for more details: <a href="https:&#x2F;&#x2F;github.com&#x2F;Sideko-Inc&#x2F;sideko" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;Sideko-Inc&#x2F;sideko</a> We’d love to hear your thoughts!

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[Other] Show HN: Turn Markdown into React/Svelte/Vue UI at runtime, zero build step

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[Code Quality] Dev-five-git/devup-ui: jsx zero-runtime ui styling library ⚡ Zero-runtime – all styles extracted at build time 🗂️ Deduplication – no repeated CSS, thanks to caching 🌍 Responsive & theming support out of the box 💻 Works in TSX/JSX directly – no separate style files needed

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