Releasesby Glyphpy-shiny shiny 1.5.1
New features - Added toast notification system with ui.toast(), ui.toast_header(), ui.show_toast(), and ui.hide_toast(). Toast notifications are temporary, non-intrusive messages that support multiple semantic types (success, warning, error, etc.), flexible positioning (9 positions: top/middle/bottom × left/center/right), auto-hide with configurable...
Also shipped Dec 8, 2025Posit in December 2025 →
Introducing iceberg-js: A JavaScript Client for Apache Iceberg
Supabase introduced iceberg-js, a vendor-agnostic JavaScript client for the Apache Iceberg REST Catalog API, enabling type-safe catalog management.
Workers - Python cold start improvements
Python Workers now feature improved cold start performance, reducing initialization time for new Worker instances. This improvement is particularly noticeable for Workers with larger dependency sets or complex initialization logic. Every time you deploy a Python Worker, a memory snapshot is captured after the top level of the Worker is executed.
Workers - Easy Python package management with Pywrangler
We are introducing a brand new tool called Pywrangler, which simplifies package management in Python Workers by automatically installing Workers-compatible Python packages into your project.
Workers - Wrangler config is optional when using Vite plugin
When using the Cloudflare Vite plugin to build and deploy Workers, a Wrangler configuration file is now optional for assets-only (static) sites. If no wrangler.toml , wrangler.json , or wrangler.jsonc file is found, the plugin generates sensible defaults for an assets-only site.
Workers - Configure Workers programmatically using the Vite plugin
The Cloudflare Vite plugin now supports programmatic configuration of Workers without a Wrangler configuration file. You can use the config option to define Worker settings directly in your Vite configuration, or to modify existing configuration loaded from a Wrangler config file.
View predictions in Cloud Provider Observability
You can now view machine learning predictions for drilldown instances of preconfigured dashboards in Cloud Provider Observability using the Predict button. Predictions help you ensure resources are available during spikes in usage, as well as help you decrease the amount of resources due to over provisioning.
More from py-shinyEvery py-shiny release →
shiny 1.6.0
OpenTelemetry Added the SHINY_OTEL_COLLECT environment variable to set the default collection level globally. Available levels: "none" - Disables all Shiny-specific telemetry collection. Use this for sensitive operations where you don't want Shiny to emit any spans or logs.
shiny 1.6.1
New features Added session.destroy() and session.on_destroy() for cleaning up reactive objects (effects, calcs, values) when dynamically inserted module UI is removed.
shiny 1.6.2
Bug fixes Adapted py-shiny to the htmltools 0.7.0 sibling-classes refactor. No runtime behavior change. Bumped lodash/lodash-es to 4.18.1 in the js-react template lockfile for CVE-2025-13465. Fixed render.DataGrid() column headers and hovered rows not adapting to dark mode when ui.input_dark_mode() is enabled.
shiny 1.6.3
New features session.destroy() now accepts an optional module id. The parent that inserted a module's UI under an id can tear down that module's scope with session.destroy(id), without the module having to hand back a cleanup handle. Added the brite theme preset, available wherever Shiny theme presets are accepted (e.g. ui.Theme() and ui.page_(theme=)).
shiny 1.6.4
Bug fixes Fixed a path-traversal vulnerability in bookmark restore (CWE-22). Introduced in 1.4.0. Reported by @0xRenSec. When bookmarked state cannot be restored, the notification shown in the client is now a generic message. The reason is logged server-side as a warning on the shiny.bookmark._restore_state logger, so app authors can still see it. (1d8ecb46)
shiny 1.7.0
New features Added test mode, enabled via the SHINY_TESTMODE=1 environment variable or the App(test_mode=) argument (which defaults to that env var). The pytest app-launch fixtures (local_app, create_app_fixture) now run apps in test mode.
shiny 1.8.0
Deprecations ui.output_text_verbatim() is deprecated and now emits a ShinyDeprecationWarning. Please use ui.output_code() / @render.code to create an output container for code (monospaced text), or ui.output_text() / @render.text to create an output container for plain text.
shiny 1.9.0
Breaking changes OpenTelemetry reactive_update spans now follow each session's cycle: one span per session, from when the session turns busy until all of its effects (including async ones) have finished, carrying the session's session.id. The session's calc, effect, and output spans are its children.