Barret Schloerke

Do you find testing in #RStats and #Python... spooky? 👻 Do not fear! Join us for Testober (h/t @schloerke.com): 🎃 10/6: Basic testing in R 🎃 10/13: Basic testing in Python 🎃 10/20: Testing in Shiny for R 🎃 10/27: Testing in Shiny for Python No tricks, only treats! Register here: pos.it/dslab

📦 Introducing shinyreact for R & Python Write your UI natively in React. Shrink your Shiny server to data-only logic. Agent Skills write the React for you. ✨ opensource.posit.co/blog/2026-09... This is the start! Tell us what you build and what breaks. #RStats #Python #Shiny #React

Shiny for Python 1.8 is out! 🎉 Test your app's server logic without a browser 🪄 test_server() runs your app in memory: set inputs, let the reactive graph settle, assert on outputs. Plain, synchronous pytest. Also: ui.page_html() and session.allow_reconnect(). opensource.posit.co/blog/2026-09...

Thrilled to have just presented "Never block, never copy. mirai + mori from Shiny to the cluster" at posit::conf(2026). The slides are available here: shikokuchuo.net/posit2026 mirai: mirai.r-lib.org mori: shikokuchuo.net/mori/ #tidyverse #rshiny #positconf2026

🎤 Just presented “shinyreact: Building Custom Shiny UI with React” at posit::conf(2026) 🤔 Ever written JS or CSS inside an R string? shinyreact moves your UI to React: two hooks on the client, reactive_output() on the server. 📚 bit.ly/posit-2026-shinyreact #rstats #shiny #reactjs

See y’all tomorrow!!

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Well, it's been a highly requested topic for the DS Lab, so @schloerke.com is going to come hang out with us on May 26th and talk about how HE uses worktrees! I hope you'll be able to make it that day!

❓Do you use git worktrees? ❓How would you describe worktrees to a newbie? ❓Do you use extensions in your IDE of choice to use them more easily? ❓Do you perhaps using a worktree-first workflow with something like Conductor or Superset? 🙏🏻 Tell me all your worktree things! #databs #rstats #pydata

Shiny for Python 1.6 is out! Two big additions: toolbar components for compact, modern UIs (thank you, @enelson5.bsky.social!) and built-in OpenTelemetry support for production observability. Zero Shiny changes required w/ usual OTel config. `pip install -U shiny` 🔗: shiny.posit.co/blog/posts/s...

gqlr v0.1.0 is now on CRAN! 🎉 A @graphql.org server for #rstats New in 0.1.0: ✨ GraphiQL interactive IDE support ✨ Verbose error messages for easier debugging 🐛 Fixed mutation execution validation 🔧 Removed pryr dependency 📚: schloerke.com/gqlr/ 🐙: github.com/schloerke/gqlr #RStats #GraphQL

🎉 shinytest2 v0.5.0 is now on CRAN! ✨ AppDriver now auto-loads local packages - no more installing required! 🔧 Pass functions directly to AppDriver$new(app_dir=). Ex: Golem's run_app() 📦 New local_app_support() & with_app_support() helpers rstudio.github.io/shinytest2/ #rstats #rshiny

I demonstrated OpenTelemetry at Japan.R 2025 last week as an example of ecosystem-wide innovation we're driving at Posit for #rstats. Now thanks to @schloerke.com we have it in a release version of Shiny. This was also a technology that other community speakers picked as one to watch in 2026!

Shiny for R v1.12 is here with built-in OpenTelemetry support! 🎉 Trace sessions and reactive calculations in production with zero code changes. Just install {otel}/{otelsdk} and set your env vars. Learn more: shiny.posit.co/blog/posts/s... #RStats #RShiny #OpenTelemetry

promises 1.4.0 is out! 🚀 * New `hybrid_then()` seamlessly handles both sync & async expressions * Add side effects to your promise chains with `then(tee=TRUE)` * OpenTelemetry tracing support install.packages("promises") Details: rstudio.github.io/promises/new...

For the #parents and #ai users… Does your parenting style match your AI management style?? 🤔🤔 * Do you limit the _client_ to small/manageable tasks? * Do you let the _client_ fumble a few times before guiding it to the intended goal? * Should your _client_ always clean up after itself? 🧺😆

Thank you for attending the #PositConf2025 Shiny session and all of your great questions! I'm excited to see the @opentelemetry.io integrations improve over time 🎉 🗣️: Observability at scale: Monitoring Shiny Applications with OpenTelemetry 🐙: github.com/schloerke/pr... #RStats #RShiny

{otel} + #rstats is becoming a crazy partnership. This project has driven me to use/write {promises} in ways that makes my 🧠 ache 😅. The reward is worth it! See you at #PositConf2025 where I'll talk about this in more detail

Slides from my #ShinyConf talk earlier today: "AI Kung-Fu 🥋: Training your LLM client in two function calls" github.com/schloerke/pr... Thank you @appsilon.bsky.social for hosting such a great event! #pystats #pyshiny #python #ai #rstats #rshiny

Want to work with me on the Shiny team at @posit.co alongside @jcheng5.bsky.social @winstonchang.bsky.social @schloerke.bsky.social @grrrck.xyz? We're looking for another engineer, apply here posit.co/job-detail/?... #rstats #rshiny #ShinyConf #python #pydata