Apps

An app is the top-level unit of the framework. You define it with an AppDefinition and register it with appLoaderService. The app root is always the chosen layout's component.

AppDefinition

Field	Required	Description
name	No*	Human-readable name. Set by hostConfig when omitted.
version	No*	Semantic version string. Set by hostConfig when omitted.
description	No	Short description.
extensions	No	List of extension ids (e.g. @eclipse-lyra/extension-command-palette) to enable when the app loads.
contributions	No	App-level contributions (UI and/or extensions).
layout	No	LayoutDescriptor: layout id (string) or { id, props? } to parameterize the layout. The app root is the chosen layout's component. Props are merged as attributes when rendering (e.g. show-bottom-panel). Defaults to 'standard'.
initialize	No	Called after extensions and contributions are registered.
dispose	No	Called when the app is unloaded.
releaseHistory	No	Static array or callback for release history (used by version-info).
metadata	No	Custom metadata (e.g. metadata.github for release checking).

* Use hostConfig: true in registerApp options so the framework fills name, version, and dependencies from the build-time plugin when available.

Layouts

Layouts are registered via LayoutContribution to the slot SYSTEM_LAYOUTS (system.layouts). Each layout has:

• id — Unique identifier (e.g. 'standard', 'dashboard').
• name — Display name (e.g. for the layout switcher).
• component — Function returning a Lit TemplateResult (the layout shell).
• onShow (optional) — Callback when the layout is shown (e.g. open a default view).

Core registers the standard layout (IDE: sidebars, editor area, bottom panel). Your app can register additional layouts (e.g. a dashboard shell) by calling contributionRegistry.registerContribution(SYSTEM_LAYOUTS, { id, name, component, onShow }). Users switch between layouts via the toolbar layout switcher; the preferred layout is persisted and used on next load.

Registration

import { appLoaderService } from '@eclipse-lyra/core';

appLoaderService.registerApp(
  {
    extensions: ['@eclipse-lyra/extension-command-palette', '@eclipse-lyra/extension-settings-tree'],
    layout: 'standard',
  },
  { autoStart: true, hostConfig: true }
);

With layout props (e.g. show bottom panel by default):

appLoaderService.registerApp(
  {
    extensions: [/* ... */],
    layout: { id: 'standard', props: { 'show-bottom-panel': true } },
  },
  { autoStart: true, hostConfig: true }
);

• autoStart — If true, the app loader starts after registration (loads extensions and renders).
• defaultAppName — App name to load when no app is specified (e.g. via URL).
• container — DOM element to render into (default: document.body).

Package info and marketplace

Add dependencies and marketplaceCatalogUrls to your app definition to show resolved dependency versions in About and to register marketplace catalog URLs. Use hostConfig: true in registerApp options so the framework fills name, version, and dependencies from the build-time plugin when available:

import { appLoaderService } from '@eclipse-lyra/core';
import appPkg from '../package.json';

appLoaderService.registerApp(
  {
    marketplaceCatalogUrls: (appPkg as any).marketplace?.catalogUrls,
    extensions: [/* ... */],
    layout: 'standard',
  },
  { autoStart: true, hostConfig: true }
);

See Build your own app.