Panel

This release primarily introduces improvements for ESM and React components and refactoring to make it easy to subclass existing components. This is an effort to make it easier to provide alternative implementations for Panel components. Additionally this release includes compatibility for Bokeh 3.7, bug fixes for `TextEditor` and a variety of other bug fixes. Many thanks to our new contributor s-alexey, our returning contributors Coderambling and the core maintainer team including Hoxbro, ahuang11 and philippjfr.

Enhancements

- Make it easier to subclass components ([7730](https://github.com/holoviz/panel/pull/7730), [#7744](https://github.com/holoviz/panel/pull/7744), [#7785](https://github.com/holoviz/panel/pull/7785))
- Allow `model.useState` in `ReactComponent`s to reference nested parameter values ([7743](https://github.com/holoviz/panel/pull/7743))
- Allow providing shared ESM modules ([7757](https://github.com/holoviz/panel/pull/7757))
- Allow defining root node for `ReactComponent` ([7787](https://github.com/holoviz/panel/pull/7787))
- Improve pretty printing in `HoloViews` pane ([7775](https://github.com/holoviz/panel/pull/7775))
- Allow serializing joint dict/Parameterized types on `DataModel` ([7789](https://github.com/holoviz/panel/pull/7789))
- Improve ListLike and NamedListLike to better match Python list behavior ([7794](https://github.com/holoviz/panel/pull/7794))
- Improve rendering of ReactComponent children ([7802](https://github.com/holoviz/panel/pull/7802))
- Allow overriding Param input widgets ([7813](https://github.com/holoviz/panel/pull/7813))

Performance

- Avoid redundant list operations in ListLike ([7764](https://github.com/holoviz/panel/pull/7764))
- Optimize ipywidget reference transform ([7778](https://github.com/holoviz/panel/pull/7778))

Bug fixes

- Correctly handle empty source files ([7732](https://github.com/holoviz/panel/pull/7732))
- Add extra guard around `get_ipython` check ([7734](https://github.com/holoviz/panel/pull/7734))
- Ensure `ReactComponent` children are sized correctly ([7741](https://github.com/holoviz/panel/pull/7741))
- Ensure `ChatStep` does not toggle from failed to success ([7742](https://github.com/holoviz/panel/pull/7742))
- Ensure `Feed` and scrollable layout children heights are not fixed ([7747](https://github.com/holoviz/panel/pull/7747))
- Declare more `Child` parameters on various components ([7749](https://github.com/holoviz/panel/pull/7749))
- Do not sync parameters mapped to None on on ESM components ([7750](https://github.com/holoviz/panel/pull/7750), [#7753](https://github.com/holoviz/panel/pull/7753))
- Always include esm.css for ESM components ([7752](https://github.com/holoviz/panel/pull/7752))
- Do not duplicate stylesheets (d133eb9)
- Ensure `ChatStep` text does not overflow container ([7770](https://github.com/holoviz/panel/pull/7770))
- Refactor `ChatFeed` post hook ensuring it processes correct message ([7722](https://github.com/holoviz/panel/pull/7722))
- Ensure hooks are applied to root components with `Fast` design ([7777](https://github.com/holoviz/panel/pull/7777))
- Ensure resource mode is set in notebooks ([7776](https://github.com/holoviz/panel/pull/7776))
- Clear state cookie if OAuth access token expired and can't be refreshed ([7780](https://github.com/holoviz/panel/pull/7780))
- Fix formatting in `TextEditor` widget ([7739](https://github.com/holoviz/panel/pull/7739))
- Use Ace version with no require.js dependency ([7781](https://github.com/holoviz/panel/pull/7781))
- Ensure multiple sequential notifications render ([7790](https://github.com/holoviz/panel/pull/7790))
- Style correct column when frozen `Tabulator` column is an index ([7792](https://github.com/holoviz/panel/pull/7792))
- Ensure IconButton tooltip timer is cleared on multiple mouseenter events ([7798](https://github.com/holoviz/panel/pull/7798))
- Ensure pre-processors are applied to ESM children ([7799](https://github.com/holoviz/panel/pull/7799))
- Ensure outputs are laid out correctly after initial render of `EditableTemplate` ([7816](https://github.com/holoviz/panel/pull/7816))
- Fix regressiong related to providing Path to ESM component stylesheets ([7809](https://github.com/holoviz/panel/pull/7809))

Compatibility

- Compatibility with Bokeh 3.7 ([7724](https://github.com/holoviz/panel/pull/7724), [#7815](https://github.com/holoviz/panel/pull/7815))
- Update `TextEditor` widget to Quill.js 2.0.2 ([7739](https://github.com/holoviz/panel/pull/7739))
- Update `Plotly` pane to Plotly.js 3.0.1 ([7731](https://github.com/holoviz/panel/pull/7731))

Documentation

- Incorrect hover text for max_width and max_height: both said Minimum instead of Maximum ([7729](https://github.com/holoviz/panel/pull/7729))
- Various minor documentation updates ([7719](https://github.com/holoviz/panel/pull/7719), [#7738](https://github.com/holoviz/panel/pull/7738), [#7746](https://github.com/holoviz/panel/pull/7746), [#7755](https://github.com/holoviz/panel/pull/7755), [#7760](https://github.com/holoviz/panel/pull/7760), [#7761](https://github.com/holoviz/panel/pull/7761), [#7763](https://github.com/holoviz/panel/pull/7763))

This patch release primarily addresses issues running Panel behind a reverse proxy, improves the developer experience of working with custom ESM bundles and adds compatibility for Plotly 6.0. Congratulations to fabiovincenzi and pankajp for their first contribution fixing inlining of stylesheets. Many thanks to to our returning contributors ceball, Azaya89 and Coderambling as well as our core developer team including ahuang11, Maximlt, hoxbro and philippjfr for contributing to this release.

Enhancements

- Add `ChatFeed.scroll_to` method ([7671](https://github.com/holoviz/panel/pull/7671))
- Implement watch feature for `panel compile` command ([7683](https://github.com/holoviz/panel/pull/7683))
- Allow ESM components to load CSS bundles ([7685](https://github.com/holoviz/panel/pull/7685), [#7691](https://github.com/holoviz/panel/pull/7691))
- Generalize `ReactiveESM.select` so children are automatically detected ([7699](https://github.com/holoviz/panel/pull/7699))

Bug fixes

- Ensure errors in sync periodic callbacks are logged ([7665](https://github.com/holoviz/panel/pull/7665))
- Reset `visible_range` when `Feed.objects` are updated ([7673](https://github.com/holoviz/panel/pull/7673))
- Ensure ESM bundles correctly resolve component implementations ([7684](https://github.com/holoviz/panel/pull/7684), [#7698](https://github.com/holoviz/panel/pull/7698))
- Fix default avatar in send/stream ([7677](https://github.com/holoviz/panel/pull/7677))
- Ensure index redirects are relative to fix index page behind a reverse proxy ([7704](https://github.com/holoviz/panel/pull/7704))
- Ensure root_url is correctly determined during auth ([7680](https://github.com/holoviz/panel/pull/7680))
- Ensure the modal is on top in EditableTemplate ([7710](https://github.com/holoviz/panel/pull/7710))
- Ensure Tabulator selection is recalculated after filtering ([7712](https://github.com/holoviz/panel/pull/7712))
- Fix custom login endpoints ([7714](https://github.com/holoviz/panel/pull/7714))
- Ensure type checkers can correctly infer extension argument types ([7709](https://github.com/holoviz/panel/pull/7709))
- Ensure custom components and extensions respect resource mode in notebooks ([7701](https://github.com/holoviz/panel/pull/7701), [#7716](https://github.com/holoviz/panel/pull/7716))
- Ensure in process events are cleaned up after they are applied ([7717](https://github.com/holoviz/panel/pull/7717))

Compatibility

- Compatibility with Plotly 6.0 ([7681](https://github.com/holoviz/panel/pull/7681), [#7682](https://github.com/holoviz/panel/pull/7682))
- Bump pyodide version to 0.27.2 and PyScript version to 2025.2.1 ([7718](https://github.com/holoviz/panel/pull/7718))

Docs

- Add links to other HoloViz libraries to the sidebar ([7674](https://github.com/holoviz/panel/pull/7674))
- Minor documentation fixes ([7664](https://github.com/holoviz/panel/pull/7664), [#7668](https://github.com/holoviz/panel/pull/7668), [#7692](https://github.com/holoviz/panel/pull/7692))

This release adds a number of features including a standalone `Modal` component, the ability to infer widget parameters from values, and the ability to easily edit a `ChatMessage`. Additionally it includes a number of enhancements for styling, particularly in dark themes, other enhancements for chat components and a large number of bug fixes. Many thanks for our returning contributor kdheepak, our new contributors pgierz, jonatantreijs and etihwo, and of course the whole maintainer team including ahuang11, MarcSkovMadsen hoxbro, maximlt and philippjfr.

Features

- Add PAM authentication support ([6861](https://github.com/holoviz/panel/pull/6861))
- Add `Widget.from_values` method ([7033](https://github.com/holoviz/panel/pull/7033))
- Add a standalone `Modal` layout ([7083](https://github.com/holoviz/panel/pull/7083))
- Introduces `ChatMessage` and `ChatFeed` edit functionality ([7559](https://github.com/holoviz/panel/pull/7559))

Enhancements

- Allow `ChatFeed.callback_exception` to accept a callable and 'traceback' (alias for verbose) ([7558](https://github.com/holoviz/panel/pull/7558))
- Fix Accordion active_header_background in dark theme ([7576](https://github.com/holoviz/panel/pull/7576))
- Increase default max character limit on `ChatAreaInput` ([7562](https://github.com/holoviz/panel/pull/7562))
- Fix chat message alignment issues ([7563](https://github.com/holoviz/panel/pull/7563))
- Make `Markdown` pane line breaking behavior configurable ([7582](https://github.com/holoviz/panel/pull/7582))
- Improve styling of chat components in dark theme ([7601](https://github.com/holoviz/panel/pull/7601), [#7602](https://github.com/holoviz/panel/pull/7602))
- Automatically scroll when streaming to `ChatFeed` and `ChatStep` ([7608](https://github.com/holoviz/panel/pull/7608))
- Add support for remote filesystems on `FileSelector` ([7618](https://github.com/holoviz/panel/pull/7618))
- Add support for `FigureWidget` events on `Plotly` pane ([7654](https://github.com/holoviz/panel/pull/7654), [#7662](https://github.com/holoviz/panel/pull/7662))

Bug fixes

- Fix Azure Oauth issues ([7587](https://github.com/holoviz/panel/pull/7587))
- Correctly display file not found paths in `panel convert` ([7589](https://github.com/holoviz/panel/pull/7589))
- Fix `Tabulator.patch` when table is filtered ([7621](https://github.com/holoviz/panel/pull/7621))
- Ensure `esbuild` can be detected on windows during `panel compile` ([7625](https://github.com/holoviz/panel/pull/7625))
- Fix various issues styling `Tabulator` when it is wider than the viewport ([7626](https://github.com/holoviz/panel/pull/7626))
- Fix resource loading when serving Panel app on nested FastAPI endpoint ([7627](https://github.com/holoviz/panel/pull/7627))
- Fix `panel oauth-secret` command ([7628](https://github.com/holoviz/panel/pull/7628))
- Ensure fonts are applied to `NotificationArea` ([7633](https://github.com/holoviz/panel/pull/7633))
- Handle session context where session is not defined ([7634](https://github.com/holoviz/panel/pull/7634))
- Ensure `CompositeWidget` can be populated in callback ([7636](https://github.com/holoviz/panel/pull/7636))
- Correctly identify skimage and PIL packages when converting to pyodide ([7637](https://github.com/holoviz/panel/pull/7637))
- Ensure we use CDN resources in pyodide ([7638](https://github.com/holoviz/panel/pull/7638))
- Consistently apply sizing_mode to `FileSelector` components ([7640](https://github.com/holoviz/panel/pull/7640))
- Ensure tasks are cancelled correctly ([7641](https://github.com/holoviz/panel/pull/7641))
- Ensure `NotificationArea` stylesheet loads in panel-preview ([7643](https://github.com/holoviz/panel/pull/7643))
- Ensure `NestedSelect` updates when `options` are changed ([7649](https://github.com/holoviz/panel/pull/7649))
- Ensure `ButtonIcon` displays an icon during click ([7650](https://github.com/holoviz/panel/pull/7650))

Compatibility and Updates

- Update `panel convert` to latest versions of pyodide and pyscript ([7584](https://github.com/holoviz/panel/pull/7584))
- Bump plotly.js version to 2.35.3 ([7657](https://github.com/holoviz/panel/pull/7657))
- Bump tabulator.js version to 6.3.1 ([7656](https://github.com/holoviz/panel/pull/7656))

Documentation

- Ensure Open in JupyterLite links work ([7622](https://github.com/holoviz/panel/pull/7622))
- Add admonitions for outdated guides and minor corrections ([7635](https://github.com/holoviz/panel/pull/7635))
- Add form tutorial ([7568](https://github.com/holoviz/panel/pull/7568))
- Fix and reorganize API docs ([7659](https://github.com/holoviz/panel/pull/7659))

This release fixes a regression causing .node_modules to be bundled into our released wheel and introduces a number of bug fixes and enhancements. Many thanks to mayonnaisecolouredbenz7, pmeier, Italirz, Coderambling and our maintainer team MarcSkovMadsen, hoxbro, ahuang11, thuydotm, maximlt and philippjfr.

Enhancements

- Add ability to `scroll_to` a particular object on `Column` ([7206](https://github.com/holoviz/panel/pull/7206))
- Add pointer when hovering on `Markdown` copy button ([7490](https://github.com/holoviz/panel/pull/7490))
- Allow streaming to `ChatStep` ([7520](https://github.com/holoviz/panel/pull/7520))
- Improve `ChatMessage` repr ([7521](https://github.com/holoviz/panel/pull/7521))
- Add `ChatInterface` button tooltips ([7552](https://github.com/holoviz/panel/pull/7552))

Bug fixes

- Ensure Notifications are cleaned up correctly ([4964](https://github.com/holoviz/panel/pull/4964))
- Ensure `FileDownload` label text updates correctly ([7489](https://github.com/holoviz/panel/pull/7489))
- Fix `Tabulator` aggregation behavior ([7450](https://github.com/holoviz/panel/pull/7450))
- Fix typing for `.servable` method ([7530](https://github.com/holoviz/panel/pull/7530))
- Ensure `NestedSelect` respects `disabled` parameter ([7533](https://github.com/holoviz/panel/pull/7533))
- Ensure errors in hooks aren't masked by fallback to different signature ([7502](https://github.com/holoviz/panel/pull/7502))
- Ensure Notifications are only shown once if scheduled onload ([7504](https://github.com/holoviz/panel/pull/7504))

Documentation

- Improve `hold` how-to guide ([7487](https://github.com/holoviz/panel/pull/7487), [#7500](https://github.com/holoviz/panel/pull/7500))

Maintenance

- Enable strict type checking ([7497](https://github.com/holoviz/panel/pull/7497))
- Ensure node_modules aren't bundled into package ([7526](https://github.com/holoviz/panel/pull/7526))
- Internal cleanup of compatibility code for older param versions ([7527](https://github.com/holoviz/panel/pull/7527))

Compatibility

- Compatibility for websockets 14 when running on FastAPI server ([7491](https://github.com/holoviz/panel/pull/7491))
- Compatibility with Textual 0.86 ([7501](https://github.com/holoviz/panel/pull/7501))
- Compatibility with Altair 5.5.0 ([7523](https://github.com/holoviz/panel/pull/7523))
- Bump Vizzu version to 0.15 ([7485](https://github.com/holoviz/panel/pull/7485))

This release primarily focuses on improving the ESM components including fixes for serialization of parameter values, improvements for compiling bundles, and building custom layouts. Additionally this release includes the new `DatetimeSlider`, adds a copy button to codeblocks in `Markdown` panes, improves responsive sizing for Plotly and starts adding better support for Polars. Many thanks and a warm welcome to our new contributor MP-MaximilianLattka as well as our maintainer team, including Hoxbro, thuydotm, ahuang11, MarcSkovMadsen and philippjfr.

Enhancements

- Add `DatetimeSlider` widget ([7374](https://github.com/holoviz/panel/pull/7374))
- Improve Jupyter preview error handling ([7434](https://github.com/holoviz/panel/pull/7434))
- Add copy button to `Markdown` codeblocks ([7451](https://github.com/holoviz/panel/pull/7451))
- Various improvements for writing ESM components ([7462](https://github.com/holoviz/panel/pull/7462))
- Log authorization callback errors ([7463](https://github.com/holoviz/panel/pull/7463))
- Support polars in `pn.cache` ([7472](https://github.com/holoviz/panel/pull/7472))
- Improve and document `hold` utility ([7474](https://github.com/holoviz/panel/pull/7474))
- Improve how `panel compile` collects bundles ([7477](https://github.com/holoviz/panel/pull/7477))

Bug fixes

- Fix issues detecting changed property values during serialization ([7432](https://github.com/holoviz/panel/pull/7432))
- Ensure ESM compilation correctly detects file extension ([7446](https://github.com/holoviz/panel/pull/7446))
- Ensure parameter overrides are applied to ESM components ([7452](https://github.com/holoviz/panel/pull/7452))
- Ensure component `Children` parameter correctly resolves when multiple types are defined ([7454](https://github.com/holoviz/panel/pull/7454))
- Fix issues using Jupyter Preview with notifications enabled ([7466](https://github.com/holoviz/panel/pull/7466))
- Ensure `HTML`/`Markdown` streaming does not freeze during rapid updates ([7480](https://github.com/holoviz/panel/pull/7480))
- Ensure `Plotly` sizes correctly on initial render ([7483](https://github.com/holoviz/panel/pull/7483))

This release fixes a number of smaller regressions related to `Tabulator` `row_content`, ensures `--dev`/`--autoreload` picks up on external modules correctly and resolves OAuth guest endpoints correctly. Additionally it introduces some enhancements and bug fixes for custom components, such as adding support for loading custom components ESM Javascript bundles from the inbuilt endpoint ensuring that the bundle can be cached by the browser. Many thanks and welcome to our new contributors chryshumble and haojungc, our returning contributors TheoMathurin, aktech and Coderambling and the core maintainer team Hoxbro, ahuang11, MarcSkovMadsen and philippjfr for their contributions to this release.

Enhancements

- Sync dark mode on `browser_info` object ([7382](https://github.com/holoviz/panel/pull/7382))
- Allow loading custom component ESM bundles from URL ([7410](https://github.com/holoviz/panel/pull/7410), [#7412](https://github.com/holoviz/panel/pull/7412))

Bug fixes

- Address issues with `Tabulator` embed_content and optimize row expansion ([7364](https://github.com/holoviz/panel/pull/7364))
- Prevent pipeline network plot from linking with other plots ([7372](https://github.com/holoviz/panel/pull/7372))
- Various fixes for custom component compilation ([7381](https://github.com/holoviz/panel/pull/7381))
- Fix OAuth guest endpoint ([7385](https://github.com/holoviz/panel/pull/7385))
- Fix `ReactiveESM._importmap` typing ([7392](https://github.com/holoviz/panel/pull/7392))
- Ensure that autoreload records modules to watch before startup ([7399](https://github.com/holoviz/panel/pull/7399))
- Prevent `Tabulator` from overlapping when `max_height` is set ([7403](https://github.com/holoviz/panel/pull/7403))
- Do not mutate layout `Children` inplace ([7417](https://github.com/holoviz/panel/pull/7403))
- Set `Tabulator` null formatter to empty string ([7421](https://github.com/holoviz/panel/pull/7421))
- Ensure Tabulator table content does not overflow ([7425](https://github.com/holoviz/panel/pull/7425))
- Ensure `cache` handles hashing of classes and instances correctly ([7478](https://github.com/holoviz/panel/issues/7478))

Compatibility

- Upgraded `Tabulator` version to 6.3 ([7419](https://github.com/holoviz/panel/pull/7419))

Documentation

- Update components_overview.md with text fixes ([7335](https://github.com/holoviz/panel/pull/7335))
- Corrected styles in doc ([7371](https://github.com/holoviz/panel/pull/7371))
- Fix typo in `panel.io.server` docstring ([7405](https://github.com/holoviz/panel/pull/7405))