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<div style="display: none; max-height: 0px; overflow: hidden;">OpenAI has released GPT-5-Codex, a better version of GPT-5 optimized for agentic coding within Codex. Codex now integrates with ChatGPT </div>
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<h1><strong> TLDR Web Dev <span id="date">2025-09-16</span></strong></h1>
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If slow QA processes bottleneck you or your software engineering team and you're releasing slower because of it — you need to check out QA Wolf.<p></p><p>They get engineering teams to <a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.qawolf.com%2F%3Futm_source=tldrwebdev%26utm_medium=newsletter%26utm_campaign=ACQ_All_Demo_Conversions__NewsletterAudience_-_Newsletter_CutQACycles_20250916-None_Experiment-FALSE%26utm_term=body-80PercentAutomatedEndToEndTestCoverage%26utm_content=CutQACycles_ScheduleADemoToLearnMore_CutQACyclesFromHoursToMinutes_Headline%253ACutYourQACyclesDownToMinutesWithQAWolf____Newsletter-PrimaryPlacement_20250916_v1_/1/0100019952351848-d2388c36-f26d-482e-a037-df69002773d9-000000/qCIkaulhYPkxLESX9kHumbvnMEevuX6cgAuHvlcggTA=422" rel="noopener noreferrer nofollow" target="_blank"><span>80% automated end-to-end test coverage</span></a> and help them <strong>ship 5x faster </strong>by reducing QA cycles from hours to minutes.</p>
<p><a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.qawolf.com%2F%3Futm_source=tldrwebdev%26utm_medium=newsletter%26utm_campaign=ACQ_All_Demo_Conversions__NewsletterAudience_-_Newsletter_CutQACycles_20250916-None_Experiment-FALSE%26utm_term=body-QAWolf%26utm_content=CutQACycles_ScheduleADemoToLearnMore_CutQACyclesFromHoursToMinutes_Headline%253ACutYourQACyclesDownToMinutesWithQAWolf____Newsletter-PrimaryPlacement_20250916_v1_/1/0100019952351848-d2388c36-f26d-482e-a037-df69002773d9-000000/lNlas7tRui8RFUgXaZDRaShULUnxrF9bn-nHnb0bz5k=422" rel="noopener noreferrer nofollow" target="_blank"><span>QA Wolf</span></a> takes testing off your plate. They can get you:</p>
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<strong>Apple has a private CSS property to add Liquid Glass effects to web content (3 minute read)</strong>
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The private Apple CSS property, `-apple-visual-effect`, enables the "Liquid Glass" effect in iOS webviews. Although this property works when manually enabled, it's inaccessible for general web development and App Store apps due to its private status. Apple probably uses this feature internally to seamlessly integrate webviews into the iOS UI.
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<strong>Falsehoods programmers believe about null pointers (12 minute read)</strong>
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Programmers commonly have some misconceptions about null pointers in languages like C, C++, and Rust. This article debunks assumptions ranging from immediate crashes upon dereferencing to the guaranteed address of zero for null pointers. These misconceptions come from compiler optimizations, platform-specific quirks, and the evolving understanding of undefined behavior.
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<strong>Why are Event-Driven Systems Hard? (7 minute read)</strong>
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Event-driven systems use asynchronous messages to trigger actions. These often have to deal with evolving message formats, which requires strategies like backward/forward compatibility and schema registries to avoid system failures. Debugging is difficult due to the distributed nature, but correlation IDs allow for tracing events across services.
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<strong>React Won by Default – And It's Killing Frontend Innovation (9 minute read)</strong>
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The widespread default adoption of React in frontend development is stifling innovation. While React is excellent, its dominance discourages the adoption and evaluation of potentially better-suited frameworks like Svelte, Solid, and Qwik. These frameworks offer unique approaches such as compile-time optimization and fine-grained reactivity, which devs should also try to keep in mind.
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<strong>Why do software developers love complexity? (5 minute read)</strong>
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Software developers often gravitate towards complexity despite the KISS principle due to its marketability and the perception that it signals expertise and innovation. This complexity can be driven by marketing hype, the creative satisfaction of solving intricate problems, the need to navigate existing convoluted codebases, and pressures to innovate within competitive team dynamics. However, unnecessary complexity creates a maintenance nightmare.
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<strong>Algolia Developer Conference (Sponsor)</strong>
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<strong>Introducing upgrades to Codex (12 minute read)</strong>
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OpenAI has released GPT-5-Codex, a better version of GPT-5 optimized for agentic coding within Codex. Codex now integrates with ChatGPT and supports various platforms like terminals, IDEs, and even mobile apps. It has a revamped Codex CLI, a new IDE extension, improved cloud infrastructure, and code review capabilities trained to catch flaws before deployment.
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<strong>macOS Tahoe (11 minute read)</strong>
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macOS Tahoe introduces a fresh, Liquid Glass design, better Continuity with iPhone through a new Phone app and Live Activities, Apple Intelligence integration for productivity boosts, and various updated features across apps like Messages, Photos, and Reminders.
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<strong>Semlib (GitHub Repo)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Semlib is a Python library that enables the creation of data processing and analysis pipelines using LLMs. It provides functional programming primitives like map, reduce, sort, and filter, but uses natural language descriptions instead of code for these operations. This approach breaks down complex tasks into simpler steps for improved quality, feasibility, latency, and cost-effectiveness.
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<div style="text-align: center;"><strong><h1>Miscellaneous</h1></strong></div>
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<strong>Which npm package has the largest version number? (15 minute read)</strong>
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This dev investigated which npm package has the largest number in its version by fetching package data from the npm registry. After fetching metadata for millions of packages, they initially found "latentflip-test" with a very large version number, which they considered invalid. After filtering and manual inspection, the author discovered that "all-the-package-names" has version 2.0.2401, making it the npm package following semantic versioning with the largest valid number.
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<strong>Hosting a Website on a Disposable Vape (7 minute read)</strong>
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This dev hosted a website on a disposable vape's microcontroller, the PUYA PY32F002B. He used semihosting to emulate a serial modem, enabling SLIP (Serial Line Internet Protocol) communication and integrating uIP for TCP/IP support. It was initially slow, but he optimized the web server by implementing a ring buffer to improve data handling and speed.
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<strong>AI hype is masking recession signals in the market (5 minute read)</strong>
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Despite record highs driven by AI excitement, the stock market is masking underlying recessionary signals in other sectors. These AI investments are primarily driving market performance, rather than consumer spending. However, a market rotation is beginning, with investors eyeing previously struggling sectors anticipating potential interest rate cuts and the impact of AI on productivity.
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<strong>TLDR Web Dev 2025 Reader Survey (1 minute)</strong>
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<h1><strong>Quick Links</strong></h1>
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<strong>Boring Work Needs Tension (2 minute read)</strong>
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Software developers can make their work more engaging by actively seeking out and resolving technical challenges ("tensions") that come up in their daily tasks.
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<strong>Vibe Coding Is Creating Braindead Coders (8 minute read)</strong>
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While AI coding tools can increase productivity, they also risk creating a generation of developers who lack deep understanding and problem-solving skills.
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<strong>How to self-host a web font from Google Fonts (3 minute read)</strong>
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To avoid leaking visitor IP addresses to Google, download Google Fonts files, self-host them with relative paths, link the CSS file in your HTML, apply the font in your CSS, and include the font's license.
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<strong>Death💀 to type classes (11 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Replacing Haskell's type classes with the Backpack module system might be a simpler, faster approach to effect systems, as you can implement Functors and effects using Backpack modules and signatures.
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