feat(202): support angular generator

[tomflenner]

This PR

• Adds Angular code generation support to the OpenFeature CLI
• Generates type-safe Angular service wrapping the OpenFeature Angular SDK
• Generates structural directives for each feature flag (boolean, string, number, object)
• Adds integration tests for Angular code generation

Related Issues

Fixes #202

Notes

This implementation follows the existing pattern established by the React generator, leveraging the official @openfeature/angular-sdk rather than reimplementing core functionality.

Structural Directives Approach:
The generated directives use Angular's hostDirectives feature to wrap the SDK's built-in directives (BooleanFeatureFlagDirective, StringFeatureFlagDirective, etc.) with pre-configured flag keys and default values. This approach:

• Provides type-safe, flag-specific directives for template usage
• Leverages existing SDK functionality rather than reimplementing it
• Maintains consistency with the SDK's directive inputs for advanced configuration
• Example: *enableFeatureA directive automatically configures the underlying BooleanFeatureFlagDirective

This design choice prioritizes developer experience (pre-configured, type-safe directives) while maintaining flexibility through the underlying SDK's input parameters.

Acknowledgments:

• Shout-out to my frontend teammate at DataGalaxy for the initial review and valuable feedback internally
• Code generation assisted by Claude Opus 4.5

Follow-up Tasks

• Consider gathering community feedback on the structural directive implementation approach

How to test

1. Run the integration test suite using make test-integration
2. Generate Angular code from a sample configuration:

openfeature generate angular -i path/to/manifest.json -o output/directory

[gemini-code-assist]

Summary of Changes

Hello @tomflenner, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the OpenFeature CLI by integrating robust Angular code generation capabilities. It allows developers to automatically create type-safe Angular services and structural directives directly from their feature flag manifests. This not only improves developer experience by reducing boilerplate and ensuring type safety but also promotes consistent and idiomatic usage of OpenFeature within Angular applications, mirroring patterns established by existing React generators.

Highlights

• Angular Code Generation: Introduces a new generate angular command to the OpenFeature CLI, enabling the creation of type-safe Angular services and directives.
• Type-Safe Services: Generates an Angular service that wraps the official OpenFeature Angular SDK, providing strongly-typed methods for accessing feature flag details.
• Structural Directives: Implements structural directives for each feature flag type (boolean, string, number, object), leveraging Angular's hostDirectives for pre-configured, type-safe template usage.
• Comprehensive Testing: Adds a dedicated integration test suite for the Angular generator, covering compilation, service functionality, and directive behavior.

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Code Review

This pull request introduces comprehensive support for Angular code generation within the OpenFeature CLI. It includes the addition of a new angular command, the implementation of the generator logic in Go, and a detailed template for generating type-safe Angular services and structural directives. Furthermore, a robust integration test suite has been added, leveraging Dagger, Vitest, and Angular's testing utilities to ensure the correctness and functionality of the generated code. The changes are well-structured and align with the existing patterns in the CLI. No issues were found that require immediate attention or fall into the critical, high, or medium severity categories.