optimizely / javascript-sdk / 19867184772

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[FSSDK-12092] add platform verification for imports  (#1112)

This PR implements a comprehensive platform isolation system for a multi-platform JavaScript SDK that supports Browser, Node.js, and React Native. The system enforces that platform-specific code cannot be imported by incompatible platforms, preventing runtime errors when bundling for different targets.

**Key changes:**
- Adds validation scripts that check `__platforms` exports and import compatibility
- Adds script to automatically add `__platforms` exports based on file name
- Integrates ESLint rule to enforce platform declarations at development time
- Adds extensive documentation and troubleshooting guides
- Updates all source files to include `__platforms` exports

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