Purpose

Bootstrap a new frontend dynamic plugin for Red Hat Developer Hub (RHDH). Frontend dynamic plugins provide UI components, pages, entity cards, themes, and visual customizations that integrate with the RHDH application shell.

Note: This skill covers frontend plugins only. Backend dynamic plugins (APIs, scaffolder actions, processors) are covered in a separate skill.

When to Use

Use this skill when creating a new frontend plugin intended for RHDH dynamic plugin deployment. This includes:

• New pages and routes

• Entity page cards and tabs

• Sidebar menu items

• Custom themes

• Scaffolder field extensions

• TechDocs addons

• Search result types and filters

• Any UI component for RHDH

Do NOT use this skill for:

• Backend API plugins

• Scaffolder actions (server-side)

• Catalog processors or providers

• Authentication modules

Prerequisites

Before starting, ensure the following are available:

• Node.js 22+ and Yarn

• Container runtime (podman or docker )

• Access to a container registry (e.g., quay.io) for publishing

Workflow Overview

• Determine RHDH Version - Identify target RHDH version for compatibility

• Create Backstage App - Scaffold Backstage app with matching version

• Create Frontend Plugin - Generate new frontend plugin using Backstage CLI

• Implement Plugin Components - Build React components and exports

• Configure Scalprum - Set up module federation for dynamic loading

• Export as Dynamic Plugin - Build and export using RHDH CLI

• Package as OCI Image - Create container image for deployment

• Configure Plugin Wiring - Define routes, mount points, and menu items

Step 1: Determine RHDH Version

Check the target RHDH version and find the compatible Backstage version. Consult references/versions.md (in the backend skill) for the version compatibility matrix.

RHDH Version Backstage Version create-app Version

1.8 / next 1.42.5 0.7.3

1.7 1.39.1 0.6.2

1.6 1.36.1 0.5.25

Ask the user which RHDH version they are targeting if not specified.

Step 2: Create Backstage Application

For RHDH 1.7 (adjust version as needed)

npx @backstage/create-app@0.6.2

cd <app-name> yarn install

(you can create backstage app in the current directory by specifying --path . )

Step 3: Decide if you want to use RHDH themes.

If you want to use RHDH themes, follow the steps below. If you don't want to use RHDH themes, skip to Step 4.

Add RHDH theme to Backstage app dependencies:

yarn workspace app add @red-hat-developer-hub/backstage-plugin-theme

Update packages/app/src/App.tsx and apply the themes to createApp :

import { getThemes } from '@red-hat-developer-hub/backstage-plugin-theme';

// ...

const app = createApp({ apis, // ... themes: getThemes(), });

Step 3: Create Frontend Plugin

Generate a new frontend plugin:

yarn new --select frontend-plugin --option id=<plugin-id>

The plugin will be created at plugins/<plugin-id>/

Generated structure:

plugins/<plugin-id>/ ├── src/ │ ├── index.ts # Public exports │ ├── plugin.ts # Plugin definition │ ├── routes.ts # Route references │ └── components/ │ └── ExampleComponent/ ├── package.json └── dev/ └── index.tsx # Development harness

Step 4: If you decided to use RHDH themes, add RHDH Theme to Development Harness

By default, yarn start uses standard Backstage themes. To preview your plugin with RHDH styling during local development, configure the RHDH theme package.

Install Theme Package

cd plugins/<plugin-id> yarn add @red-hat-developer-hub/backstage-plugin-theme

Configure Development Harness

Update dev/index.tsx to use RHDH themes:

import { getAllThemes } from '@red-hat-developer-hub/backstage-plugin-theme'; import { createDevApp } from '@backstage/dev-utils'; import { myPlugin, MyPage } from '../src';

createDevApp() .registerPlugin(myPlugin) .addPage({ element: <MyPage />, title: 'My Plugin', path: '/my-plugin', }) .addThemes(getAllThemes()) .render();

Available Theme APIs

• getThemes() / useThemes()

• Latest RHDH light and dark themes

• getAllThemes() / useAllThemes()

• All themes including legacy versions

• useLoaderTheme()

• Returns Material-UI v5 theme object

Note: When deployed to RHDH, the application shell provides theming automatically. This configuration is only needed for local development.

Step 5: Implement Plugin Components

Page Component

Create a full-page component for dynamic routes:

// src/components/MyPage/MyPage.tsx import React from 'react'; import { Page, Header, Content } from '@backstage/core-components';

export const MyPage = () => ( <Page themeId="tool"> <Header title="My Plugin" /> <Content> <h1>Hello from My Plugin</h1> </Content> </Page> );

Entity Card Component

Create a card for entity pages:

// src/components/MyCard/MyCard.tsx import React from 'react'; import { InfoCard } from '@backstage/core-components'; import { useEntity } from '@backstage/plugin-catalog-react';

export const MyEntityCard = () => { const { entity } = useEntity(); return ( <InfoCard title="My Plugin Info"> <p>Entity: {entity.metadata.name}</p> </InfoCard> ); };

Export Components

Export all components in src/index.ts :

// src/index.ts export { myPlugin } from './plugin'; export { MyPage } from './components/MyPage'; export { MyEntityCard } from './components/MyCard';

Build and verify:

cd plugins/<plugin-id> yarn build

Step 6: Export as Dynamic Plugin

cd plugins/<plugin-id> npx @red-hat-developer-hub/cli@latest plugin export

Output shows the generated Scalprum configuration:

No scalprum config. Using default dynamic UI configuration: { "name": "my-org.plugin-my-plugin", "exposedModules": { "PluginRoot": "./src/index.ts" } }

The dist-dynamic/ directory contains:

• dist-scalprum/

• Webpack federated modules

• package.json

• Modified for dynamic loading

Step 7: Package as OCI Image

npx @red-hat-developer-hub/cli@latest plugin package
--tag quay.io/<namespace>/<plugin-name>:v0.1.0

podman push quay.io/<namespace>/<plugin-name>:v0.1.0

Step 8: Configure Plugin Wiring

Frontend plugins require configuration in dynamic-plugins.yaml to define how they integrate with RHDH. This is the critical step that differentiates frontend from backend plugins.

Basic Structure

plugins:

• package: oci://quay.io/<namespace>/<plugin-name>:v0.1.0!my-plugin disabled: false pluginConfig: dynamicPlugins: frontend: my-org.plugin-my-plugin: # Must match scalprum.name dynamicRoutes: [] # Full page routes mountPoints: [] # Entity page integrations menuItems: {} # Sidebar configuration appIcons: [] # Custom icons routeBindings: {} # External route bindings

Dynamic Routes (Full Pages)

Add a new page with sidebar menu:

dynamicRoutes:

• path: /my-plugin importName: MyPage menuItem: icon: dashboard text: My Plugin

Mount Points (Entity Cards)

Add a card to entity overview:

mountPoints:

• mountPoint: entity.page.overview/cards importName: MyEntityCard config: layout: gridColumn: '1 / -1' if: allOf: - isKind: component

Menu Items (Sidebar)

Configure sidebar ordering and nesting:

menuItems: my-plugin: priority: 10 parent: tools tools: icon: build title: Tools priority: 50

See references/frontend-wiring.md for complete wiring options.

Common Wiring Patterns

Entity Tab with Cards

entityTabs:

• path: /my-tab title: My Tab mountPoint: entity.page.my-tab

mountPoints:

• mountPoint: entity.page.my-tab/cards importName: MyTabContent

Conditional Rendering

mountPoints:

• mountPoint: entity.page.overview/cards importName: MyCard config: if: anyOf: - hasAnnotation: my-plugin/enabled - isType: service

Custom Icons

appIcons:

• name: myCustomIcon importName: MyCustomIcon

dynamicRoutes:

• path: /my-plugin importName: MyPage menuItem: icon: myCustomIcon text: My Plugin

Known Issues

MUI v5 Styles Missing

If using MUI v5, add class name generator to src/index.ts :

import { unstable_ClassNameGenerator as ClassNameGenerator } from '@mui/material/className';

ClassNameGenerator.configure(componentName => componentName.startsWith('v5-') ? componentName : v5-${componentName} );

export * from './plugin';

Grid Spacing Missing

Apply spacing manually to MUI v5 Grid:

<Grid container spacing={2}> <Grid item>...</Grid> </Grid>

Debugging

Frontend plugins can be debugged in browser DevTools:

• Open Developer Tools (F12)

• Go to Sources tab

• Find plugin source files (source maps included)

• Set breakpoints

Additional Resources

Reference Files

• references/frontend-wiring.md

• Complete mount points, routes, bindings

• references/entity-page.md

• Entity page customization

Example Files

• examples/frontend-plugin-config.yaml
• Complete frontend wiring example

External Resources

• RHDH Frontend Plugin Wiring

• Backstage Plugin Development