feat(angular): add convenience value method alongside details method in generated service

[tomflenner]

This PR

Adds a new convenience method in the generated Angular service that directly returns an Observable<T> of the flag value, in addition to the existing get<FlagName>Details method returning Observable<EvaluationDetails<T>>.

Today, the generator produces:

getMySuperFeatureDetails(
  domain?: string,
  options?: AngularFlagEvaluationOptions
): Observable<EvaluationDetails<boolean>> {
  return this.flagService.getBooleanDetails(
    "my-super-feature",
    true,
    domain,
    {
      updateOnConfigurationChanged: options?.updateOnConfigurationChanged ?? true,
      updateOnContextChanged: options?.updateOnContextChanged ?? true,
    }
  );
}

In most modern Angular applications (especially when using Signals), consumers are primarily interested in the flag value:

private mySuperFeatureEnabled = toSignal(
  this.featureFlagService
    .getMySuperFeatureDetails()
    .pipe(map((details) => details.value))
);

This PR adds a generated convenience method:

getMySuperFeature(
  domain?: string,
  options?: AngularFlagEvaluationOptions
): Observable<boolean> {
  return this.getMySuperFeatureDetails(domain, options).pipe(
    map((details) => details.value)
  );
}

This allows a simpler usage:

private mySuperFeatureEnabled = toSignal(
  this.featureFlagService.getMySuperFeature()
);

• adds a new generated convenience method returning Observable<T>
• reduces repetitive .pipe(map(details => details.value)) boilerplate
• aligns Angular generator behavior with the C# generator
• improves developer ergonomics for common use cases

Related Issues

Fixes #226

Notes

This is a non-breaking, additive feature.

The existing get<FlagName>Details method remains unchanged to preserve access to full EvaluationDetails when needed.

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 enhances the generated Angular service by adding a convenience method for retrieving flag values directly as Observables. This simplifies common use cases, reduces boilerplate, and aligns the Angular generator with the C# generator, improving developer ergonomics.

Highlights

• New Convenience Method: Introduces a new method in the generated Angular service that directly returns an Observable<T> of the flag value, complementing the existing get<FlagName>Details method.
• Simplified Usage: Reduces boilerplate code by eliminating the need for .pipe(map(details => details.value)) when consumers primarily need the flag value.
• Alignment with C# Generator: Ensures consistency across different language generators by aligning the Angular generator behavior with the C# generator.

Changelog

• internal/cmd/testdata/success_angular.golden
  • Added new convenience methods for retrieving flag values directly as Observables.
• internal/generators/angular/angular.tmpl
  • Added template logic to generate the new convenience methods in the Angular service.
• test/angular-integration/specs/service.spec.ts
  • Added integration tests to verify the functionality of the new convenience methods.

Activity

• The PR introduces a new convenience method in the generated Angular service.
• The existing get<FlagName>Details method remains unchanged to preserve access to full EvaluationDetails when needed.
• Integration tests were added to verify the new functionality.

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[gemini-code-assist]

Code Review

This pull request introduces convenience methods to the generated Angular service, allowing direct access to flag values as Observable<T> instead of Observable<EvaluationDetails<T>>. This improves developer ergonomics by reducing boilerplate. The changes include adding map operator imports and generating new methods that pipe the existing Details methods to extract the value property. New integration tests have also been added to cover these convenience methods.