fix(build): fix x86_64 simulator build and spm_dependency guard

[eszlamczyk]

What/Why?

Fixes #527 — iOS builds fail when compiling universal simulator targets with LaTeX math (RaTeX) enabled (>= 0.7).

RaTeX's Swift wrapper is compiled from SPM source, so its RaTeX.swiftmodule is emitted only for the arch(es) the build requests. Under ONLY_ACTIVE_ARCH on Apple Silicon that's arm64 only, but universal simulator builds (archive, "Any iOS Simulator Device", Release) also compile this pod for x86_64 and then fail with:

could not find module 'RaTeX' for target 'x86_64-apple-ios-simulator'; found: arm64-apple-ios-simulator

Two podspec fixes:

• Exclude x86_64 for the simulator when math is enabled (EXCLUDED_ARCHS[sdk=iphonesimulator*]), applied to both the pod target and the app target (user_target_xcconfig) so their arch sets stay in sync. Apple Silicon only; Intel simulator builds aren't supported when math is on (consumers can disable math via ENV['ENRICHED_MARKDOWN_ENABLE_MATH'] = '0').
• Fix the spm_dependency availability guard. defined?(:spm_dependency) uses a symbol literal, so it always returns "expression" (truthy) and never guards. On RN versions without spm_dependency, pod install crashed with NoMethodError. Changed to defined?(spm_dependency) for a clean fallback.

Testing

• pod install + xcodebuild -sdk iphonesimulator -configuration Release -destination 'generic/platform=iOS Simulator' build in the example app — previously failed, now succeeds.

• Verified the exclusion lands in both ReactNativeEnrichedMarkdown.*.xcconfig and Pods-*.xcconfig.

• Verified the guard fix with a Ruby repro: old form passes even when the method is undefined (→ NoMethodError); new form skips cleanly when absent and still passes on RN 0.86. Full pod install re-run confirms no regression.

  PR Checklist

  • Code compiles and runs on iOS
  • Code compiles and runs on Android
  • Updated documentation/README if applicable
  • Ran example app to verify changes
  • E2E tests are passing
  • Required E2E tests have been added (if applicable)

[Copilot]

Pull request overview

This PR addresses iOS build failures when LaTeX math rendering (RaTeX via SPM) is enabled, particularly for universal iOS Simulator builds, and fixes a Ruby guard intended to avoid calling spm_dependency when it isn’t available.

Changes:

• Fixes the spm_dependency availability check in the podspec.
• Adds simulator EXCLUDED_ARCHS settings when math is enabled to prevent x86_64 simulator module resolution failures.
• Ignores the example app’s CocoaPods SPM cache directory (.spm.pods) in .gitignore.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/react-native-enriched-markdown/ReactNativeEnrichedMarkdown.podspec	Fixes spm_dependency guard and adds simulator arch exclusions when math is enabled.
.gitignore	Ignores the example iOS .spm.pods directory produced by CocoaPods/SPM integration.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 2 changed files in this pull request and generated no new comments.