Migrate to Backstage new frontend system #3
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Implements #6421 - adds `/alpha` export path that uses Backstage's new
declarative frontend system while maintaining backward compatibility with
the existing legacy export.
Changes:
- Add `@backstage/frontend-plugin-api` dependency
- Create `src/alpha.ts` with new frontend system plugin using:
- EntityContentBlueprint for FlagsTab
- EntityCardBlueprint for FlagsmithOverviewCard and FlagsmithUsageCard
- Add exports and typesVersions configuration to package.json
Usage:
- Legacy: `import { flagsmithPlugin } from '@internal/plugin-flagsmith'`
- Alpha: `import flagsmithPlugin from '@internal/plugin-flagsmith/alpha'`
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Remove plugin.ts, routes.ts, and plugin.test.ts that were part of the legacy Backstage frontend system using createPlugin API. BREAKING CHANGE: Legacy plugin export removed. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Consolidate alpha.ts into index.ts as the main plugin export. The plugin now uses createFrontendPlugin with EntityContentBlueprint and EntityCardBlueprint from the new Backstage frontend system. Exports: - default: flagsmithPlugin (new frontend system) - flagsmithPlugin: named export for compatibility - FlagsTab, FlagsmithOverviewCard, FlagsmithUsageCard: components 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Remove the separate /alpha export since the new frontend system is now the default export at the package root. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Remove registerPlugin call since the new frontend system plugin is not compatible with the legacy dev-utils registerPlugin API. Components are rendered directly via addPage instead. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Keep only the default plugin export. The new frontend system handles component registration via blueprints automatically. Dev server now imports components directly from their files. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
talissoncosta
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Summary
Migrate the Flagsmith plugin to use Backstage's new frontend system as the default export, replacing the legacy
createPluginAPI.Closes #6421
Changes
plugin.ts,routes.ts)createFrontendPluginfrom@backstage/frontend-plugin-apias the default exportEntityContentBlueprintfor the flags tabEntityCardBlueprintfor overview and usage cards/alphaexport path (new system is now the default)Breaking Changes
flagsmithPluginnamed export removedTest plan
yarn buildpassesyarn startruns dev server successfully🤖 Generated with Claude Code