Normalize allOf with single model to aliases

[t-unit]

No description provided.

[Copilot]

Pull request overview

This PR introduces an AllOfNormalizer transformer that simplifies OpenAPI allOf schemas containing a single model by converting them to type aliases. This addresses common patterns (used by Spotify and others) where allOf: [$ref, {description: ...}] is used solely to add documentation to referenced schemas.

Changes:

• Adds AllOfNormalizer class with deep transformation logic and memoization for referential consistency
• Makes ResponseHeaderObject, ResponseBody, and RequestContent classes mutable by removing @immutable annotations, making fields non-final, and removing equality implementations
• Adds comprehensive test coverage for the normalizer including edge cases and deep transformations

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/tonik_core/lib/src/transformer/allof_normalizer.dart	New transformer implementing single-model AllOf → Alias normalization with deep traversal and memoization
packages/tonik_core/test/src/transformer/allof_normalizer_test.dart	Comprehensive test suite covering normalization, edge cases, and deep transformation scenarios
packages/tonik_core/lib/tonik_core.dart	Exports the new AllOfNormalizer transformer
packages/tonik_core/lib/src/model/response_header.dart	Makes ResponseHeaderObject mutable to enable in-place model updates
packages/tonik_core/lib/src/model/response.dart	Makes Response and ResponseBody classes mutable
packages/tonik_core/lib/src/model/request_body.dart	Makes RequestContent mutable

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Codecov Report

❌ Patch coverage is 40.00000% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.80%. Comparing base (e430bb8) to head (4471c73).

Files with missing lines	Patch %	Lines
...nik_core/lib/src/transformer/allof_normalizer.dart	38.52%	75 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   89.09%   88.80%   -0.29%     
==========================================
  Files         146      147       +1     
  Lines       11838    11925      +87     
==========================================
+ Hits        10547    10590      +43     
- Misses       1291     1335      +44     

Files with missing lines	Coverage Δ
...ackages/tonik_core/lib/src/model/request_body.dart	42.85% <100.00%> (+1.78%)	⬆️
packages/tonik_core/lib/src/model/response.dart	51.85% <100.00%> (+2.67%)	⬆️
...ages/tonik_core/lib/src/model/response_header.dart	50.00% <100.00%> (+19.81%)	⬆️
...nik_core/lib/src/transformer/allof_normalizer.dart	38.52% <38.52%> (ø)

Files with missing lines	Coverage Δ
...ackages/tonik_core/lib/src/model/request_body.dart	42.85% <100.00%> (+1.78%)	⬆️
packages/tonik_core/lib/src/model/response.dart	51.85% <100.00%> (+2.67%)	⬆️
...ages/tonik_core/lib/src/model/response_header.dart	50.00% <100.00%> (+19.81%)	⬆️
...nik_core/lib/src/transformer/allof_normalizer.dart	38.52% <38.52%> (ø)

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