Jeroen Janssen

It's now possible to compile Python extensions (C, C++, Rust etc) to WebAssembly and distribute them through PyPI such that Pyodide can install them directly simonwillison.net/2026/Jun/13/...

Emscripten 6.0.0 is out! 🚀 github.com/emscripten-c... Includes a lot of modernization to things like browser support, dynamic linking, and windows launchers.

“VSTest is Removing its Newtonsoft.Json Dependency” VSTest is moving to System.Text.Json (and JSONite on .NET Framework) for a leaner, more secure test platform. Most projects are unaffected; edge cases get simple one‑line fixes. 👉 Read: ift.tt/PYIZ0Ny

Published a new tool that lets you record all .NET exceptions system-wide in all processes: github.com/KirillOsenko... dotnet tool update -g beetle It records AllExceptions.beetle, which is like a binlog for exceptions. There's also an MCP that can read and analyze .beetle files.

Ik vind deze campagne erg belangrijk. U kunt ook tekenen, geen gevoelige Nederlandse digitale privacy info "bereikbaar dan wel manipuleerbaar" door zeer dubieus regime in USA actie.degoedezaak.org/petitions/st...

An unaccounted for part of the economy is how much young people virulently hate AI, despite how aggressively it's being forced on them. They realize it's making their friends dumber and ruining the world and they want nothing to do with it. From the Penn student paper: www.thedp.com/article/2026...

The #AspireConf 2026 Keynote is starting NOW 💫 9:00 AM - 10:00 AM PT Join us LIVE: youtu.be/6j61K9Sna2M Follow the conversation: #AspireDev #AspireConf

@aspire.dev I am using Aspire 13.1.3 AddJavascriptApp WithEnvironment to set HTTPS_PROXY so npm install can go through our corporate proxy. But this does not seem to work, inspecting the npm install process spawned by dcp reveals it isn’t set. What is the recommended way to do this?

Announcing the Zero Token architecture. Instead of burning AI tokens, you learn to think for yourself, and complete tasks using your brain.

MCP server of the day: mcp-binlog-tool. Rather than manually generate and inspect msbuild binary logs, why not have GitHub Copilot just build and analyze it? Those binlogs contain a *LOT* more information than what you see in the terminal output: github.com/baronfel/mcp...

@vscode.dev is there a way to white list/start an extension command through the vscode: uri handler? E.g. we have a custom extension that can be used to analyze development logfiles and I would like to open these logfiles from our internal test results website through a vscode: link

My latest side project, this takes an MSBuild binlog file and transforms it into a Perfetto trace msbuild-binlog-perfview.pages.dev

@james.newtonking.com is grpc-dotnet 2.76.0 officially relased? There is a nuget (and a -pre1 one), but on GitHub there are no release notes or git tag for grpc-dotnet 2.76.0

The first Monday of the new year means... predictions! Thrilled to announce that @simonwillison.net will again be joining @ahl.bsky.social and me for 1- 3- and 6-year predictions. Bring your own predictions and join us today at a special time: 4p Pacific! discord.gg/QrcKGTTPrF?e...

Here's my enormous round-up of everything we learned about LLMs in 2025 - the third in my annual series of reviews of the past twelve months simonwillison.net/2025/Dec/31/... This year it's divided into 26 sections! This is the table of contents:

Bert Hubert over digitale autonomie, w.o. DigiD, Microsoft, de grillen van Trump, enzovoort. Als je een uurtje over hebt, luisteren! Als je dat niet hebt, tijd voor maken en ook luisteren.

It's #SynthV_ASTERIAN 's anniversary of release today! If you have anything to say or anything to share to celebrate ASTERIAN's third anniversary today, we would love if you would take the time to let us know. Thank you for your support of ASTERIAN since 2022!

MSBuild tip: if you're working with binlogs, set the environment variable MSBuildLogPropertyTracking=15. It enables logging of where each property was initially assigned from during evaluation and lights up more features in the binlog viewer.

Oh how I wish Microsoft would hire you (no matter the price) to simply fix shit in windows. Free reign. "Bruce, we don't want to see you, just the commits, fix stuff. We'll pay whatever you want" It'll be beneficial for all.

www.youtube.com/live/rpw0s_6...

Some great charts on #AI from the Wall Street Journal. t.ly/xvvbw "AI products would have to create an additional $650 billion a year, indefinitely, to give investors a reasonable 10% annual return. That’s more than 150% of Apple’s yearly revenue"

Trying to measure coding productivity is, and always will be, a fool's errand. Why? Because I can go for a walk then take a shower and have an idea, then write a single line of code that fixes everything I was working on. Immense productivity, but by most metrics I didn't do anything at all.

AI PRs where the author doesn't have an understanding of the system shift the burden of understanding onto the reviewer. So now it's on the reviewer to gain an understanding of this area to either confirm or refute. The author saved time at the expense of the reviewer.

youtu.be/QWi_bvQc4fc?... #dotnet

I am excited for #dotnetconf, I've secured a spot for a talk and will show the best new things in #dotnet test and #mstest. Hope that you join me to see the cool stuff we've been working on throughout the past year. (It is on day 2).

Now that #dotnet code coverage will be coming to #visualstudio professional 2026, is there perhaps also any info on Testcase Impact Analysis ( #TIA) for #azuredevops CI/CD pipelines (as far as I can tell it was never supported for .Net Core?)

New in MSBuild Structured Log Viewer: property trail showing reads and writes during evaluation, in order: github.com/KirillOsenko... If you've ever had ordering issues where someone reads your property before you wrote to it, this is the tool for you.

Looking forward to the Sneak Peak at ARA 3.0 @audiodevcon.bsky.social 2025 Talk conference.audio.dev/session/2025... (Embracing Audio Synthesis) by Stefan Gretscher (Celemony)

Spotify is now running ICE recruitment ads. We asked them to stop. They ignored us. Let's show them what we showed Disney. No Kings, No Collaborators, No Capitulators. indivisible.org/cancel-spotify

TLDR; The PSF has made the decision to put our community and our shared diversity, equity, and inclusion values ahead of seeking $1.5M in new revenue. Please read and share. pyfound.blogspot.com/2025/10/NSF-... 🧵

Discover the origins of Vox Machina and The Mighty Nein with the Critical Role Comics Collection featuring an absolute stack of titles to read under twin moons! Supports the Critical Role Foundation | https://bit.ly/3WgbMc9

visual studio 2026 insider edition includes code coverage tools in its community edition. bad news for ncrunch and others, but great news for OSS devs. (also, a great way to upsell AI)

ALERTA! De regering heeft zonder veel bombarie een internetconsultatie ingediend om de tijd dat je hier moet wonen om Nederlander te worden gigantisch op te rekken. Van 5 naar 10 jaar! Hieronder kan je laten weten wat je vindt van onmenselijk beleid: internetconsultatie.nl/naturalisati...

Wow, @drewnoakes.bsky.social and I have debugged deep into MSBuild just now to bring you this magnificent and horrifying MSBuild behavior: github.com/dotnet/msbui...

Er is geen tijd te verliezen! nerdvote.nl is er om ieder kandidaat-kamerlid te steunen wat zich kan en wil inzetten voor veilige & verantwoorde ICT, en dat we niet onze hele overheid uploaden naar Amerika! Als eerste actie: @barbarakathmann.bsky.social hoger op de GL-PvdA lijst!

My team at Apple is currently hiring for a role that focuses on compiler tools and infrastructure. If you’re interested in this opportunity, please take a look at the job posting here: jobs.apple.com/en-us/detail... #llvm #swiftlang

I'm officially available for consulting! Need C++ expertise for games or software? Could use some profiling and optimization? Want training your employees? Feel free to reach out! And remember, if it's not made in the Champagne region of France, it's only ✨Sparkling Code AB✨!

@simonwillison.net have you seen youtu.be/3pdlTMdo7pY?... yet by any chance? What are you thoughts on it in relation to the current developments (and limitations) in AI/LLMs

Ran into the situation again where updating VS broke incremental builds, because a different compiler version is now being stamped into the embedded PDB, invalidating all caches and resulting in different PE file bytes from identical sources. Glad I invested in the fancy PE parser and differ!

#QQs - I have questions about resumes. (Comment here or on LinkedIn) www.linkedin.com/posts/garret...

Here's the full workshop handout plus annotated slides from "Building software on top of Large Language Models", a three hour tutorial I presented yesterday at PyCon US #PyConUS simonwillison.net/2025/May/15/...

On May 14th, 2021, we made our first step into vocal synthesis. 4 years later, our vocal lineup has expanded to 6, with thousands of users around the world! On today, our 4th anniversary, thank you so much for your support - both now and into the future! eclipsedsounds.com/pages/es-ann...

We have an SDE II position on my team. No external link, but if I know you, you can send me your resume.

if you know someone who was impacted, call them. Support them, lend them your network, your references, your referrals, and your time. This is a day with a lot of tears.

There are a lot of incredibly talented people on the job market right now. Many of my friends in DevRel, OSPO, program management, and engineering are looking for their next role, some have been searching for months. If you’re hiring, please consider sharing a link to your open roles below. TY ❤️

New feature in MSBuild Structured Log Viewer: Target Graph! It parses the preprocessed XML and constructs the target graph where edges are BeforeTargets, DependsOnTargets and AfterTargets.

We're excited by this year's summer of code projects! ⛱️🧑‍💻They focus on improving Swift tooling and language interoperability, from VSCode to Java interop. Check them out here: forums.swift.org/t/gsoc-2025-... #GSOC25