ast-merge v4.0.4 released!

🏷️ release 👪 ast-merge 🏷️ v4.0.4

4.0.4 - 2026-01-20

RSpec Split Loading Pattern: New files for granular RSpec dependency tag loading
- lib/ast/merge/rspec/setup.rb - Loads only registry and helper classes (no RSpec configuration)
- lib/ast/merge/rspec/dependency_tags_helpers.rb - DependencyTags helper module
- lib/ast/merge/rspec/dependency_tags_config.rb - RSpec.configure block with exclusion filters
- Enables registering known gems before RSpec.configure runs (solving catch-22 problem)
- Required for ast-merge test suite to preserve SimpleCov coverage
- Required for merge gems that register other merge gems as dependencies
Ast::Merge::RSpec::MergeGemRegistry.force_check_availability!: Deferred availability checking for accurate test coverage
- Called automatically in before(:suite) hook AFTER SimpleCov is loaded
- Prevents premature gem loading that would bypass coverage instrumentation
- Ensures accurate coverage reporting in merge gem test suites

RSpec Dependency Tags: Fixed exclusion filter setup to properly skip tests when optional gems unavailable
- Exclusion filters now set during RSpec.configure (not in before(:suite) which runs too late)
- Fixed RSpec API usage: config.filter_run_excluding tag => true (not [tag] = true)
- ast-merge uses split loading pattern in spec/spec_helper.rb and spec/config/tree_haver.rb
- markdown-merge uses split pattern (registers :commonmarker_merge, :markly_merge)
- markly-merge uses split pattern (registers :prism_merge)
- commonmarker-merge uses simple pattern (no registrations needed)

Test coverage accuracy: Fixed premature gem loading that bypassed SimpleCov instrumentation
- MergeGemRegistry.registered_gems now returns ONLY explicitly registered gems, not all KNOWN_GEMS
- RSpec exclusion filters are configured in before(:suite) hook after force_check_availability! runs
- This ensures gems are loaded AFTER SimpleCov sets up coverage instrumentation
- Previously, commonmarker-merge reported only 11 lines covered when it should have been far more
RSpec Dependency Tags: Tests with tags like :markdown_merge, :markly_merge now properly skip when those gems aren’t available
- Fixed 141 test failures caused by tests running without required gems loaded
- Removed require statements from integration specs - dependency tags handle gem loading
- Fixed tag usage: Tests using Markdown::Merge::PartialTemplateMerger with :markly backend now correctly tagged with both :markdown_merge and :markly_merge
Thread-Safety Spec: Fixed JRuby concurrency test failure in NodeTyping::Normalizer#canonical_type
- Changed from unsynchronized Array to thread-safe Queue for collecting results from concurrent threads
- Eliminates ConcurrencyError: Detected invalid array contents due to unsynchronized modifications

Official Discord 👉️

Many paths lead to being a sponsor or a backer of this project. Are you on such a path?