Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Changelogs can change! If you spot something is wrong or missing, please consider opening an issue or a pull request to fix it.

[5.0.0] - 2025-04-19

Added

• [lustre] Added a send function for sending messages to an app’s runtime.
• [lustre] Defines new Runtime and RuntimeMessage types to model communication with running apps.
• [lustre/attribute] Added many many attributes to lustre/attribute.
• [lustre/component] Added a lustre/component module with attributes and effects to access Custom Element features such as slots, parts, and CSS custom states.
• [lustre/component] Component’s can be notified of browser autofill requests using the on_form_autofill configuration option.
• [lustre/component] Component’s can be notified of browser restore requests using the on_form_restore configuration option.
• [lustre/component] Component’s can be notified of form reset events using the on_form_reset configuration option.
• [lustre/component] Component’s can listen to attribute value changes using the on_attribute_change configuration option.
• [lustre/component] Component’s can listen to property value changes using the on_property_change configuration option.
• [lustre/component] Component’s can now be made form-associated custom elements using the form_associated configuration option.
• [lustre/component] Component’s can now control whether their shadow dom is open or closed using the open_shadow_root configuration option.
• [lustre/effect] A new after_paint effect allows you to run an effect after the browser paints.
• [lustre/effect] A new before_paint effect allows you to run an effect before the browser paints.
• [lustre/element] Added a new unsafe_raw_html function allows you to render raw unescaped HTML.
• [lustre/element/keyed] Added a lustre/element/keyed module with convenience functions for common keyed elements.
• [lustre/server_component] Defines a new ClientMessage type to model messages sent from the server to the client.
• [lustre/server_component] Added a TransportMethod type and method attribute to choose between websocket, sse, and http methods for server component clients.
• [lustre/server_component] Adds an element function to more-conveniently create the <lustre-server-component> HTML element.
• [lustre/server_component] Adds a subject function to recover the process.Subject of a server component’s runtime.
• [lustre/server_component] Adds a pid function to recover the process.Pid of a server component’s runtime.
• [lustre/server_component] Adds register_subject and deregister_subject functions for Erlang-based server components.
• [lustre/server_component] Adds register_callback and deregister_callback functions for JavaScript-based server components.

Changed

• [lustre] App constructors such as simple and application now have labelled arguments.
• [lustre] component no longer takes a Dict of attribute change callbacks and now takes a list of configuration options.
• [lustre] start and start_server_component now return the new Runtime type.
• [lustre/attribute] property now requires a Json value instead of any dynamic.Dynamic value.
• [lustre/element] fragment no longer renders a wrapper div around its children.
• [lustre/event] Event handlers written using on now use the new gleam/dynamic/decode API.
• [lustre/event] The submit event now includes a list for form data entries for processing.
• [lustre/event] prevent_default and stop_propagation are now modifiers of the event attribute itself.
• [lustre/server_component] decode_action has been replaced with runtime_message_decoder.
• [lustre/server_component] encode_patch has been replaced with client_message_to_json.

Removed

• [lustre] The Action, ClientSpa, Patch, and ServerComponent types have been removed from the lustre module.
• [lustre] start_actor has been removed in favour of a unified start_server_component for both targets.
• [lustre/attribute] The on function has been removed in favour of the event.on function.
• [lustre/element] The keyed function has been removed and replaced by a dedicated lustre/element/keyed module.
• [lustre/event] The checked, mouse_position, and value decoders have been removed.
• [lustre/server_component] The deprecated set_selector effect has been removed.
• [lustre/server_component] subscribe and unsubscribe have been removed.
• [lustre/server_component] The data attribute has been removed.