Implement TypeScript strict mode for type safety

[Qoder-Voidd]

🛡️ Implement TypeScript Strict Mode for Improved Type Safety

Summary

This PR enables TypeScript's strict mode across the project to strengthen type safety, catch potential issues during compilation, and improve overall code reliability. Existing type inconsistencies and unsafe patterns have been resolved to ensure compatibility with strict type checking.

Changes Implemented

🔒 Enable Strict Mode

• Enabled "strict": true in tsconfig.json.
• Reviewed and updated related compiler options to ensure consistent type enforcement.

🛠 Fix Strict Type Errors

• Resolved all TypeScript compilation errors introduced by strict mode.
• Added explicit type annotations where inference was insufficient.
• Handled nullable and undefined values safely.
• Improved type definitions for functions, props, state, and API responses.
• Removed unsafe type assertions and implicit any usage where applicable.

🧪 Testing & Validation

• Added tests covering edge cases exposed by stricter type checking.
• Verified application behavior remains unchanged after type-related refactoring.
• Confirmed successful builds and test execution with strict mode enabled.

📚 Documentation

• Updated developer documentation to include:

  • TypeScript strict mode requirements.
  • Guidelines for handling nullable values and type assertions.
  • Best practices for maintaining strict type compliance.

Why

The project previously relied on TypeScript's standard configuration, allowing certain type-related issues to go undetected until runtime. Enabling strict mode provides stronger compile-time guarantees and helps prevent bugs before deployment.

Benefits

• ✅ Improved type safety across the codebase
• ✅ Earlier detection of potential bugs
• ✅ Reduced runtime errors
• ✅ Better IDE support and autocomplete
• ✅ More maintainable and self-documenting code
• ✅ Increased confidence when refactoring

Acceptance Criteria

• ✅ Enable strict mode in tsconfig.json
• ✅ Fix all strict type errors
• ✅ Add tests for edge cases
• ✅ Verify no regressions
• ✅ Document strict mode requirements

Validation

• TypeScript compiles successfully with strict mode enabled.
• Existing functionality remains intact.
• Automated tests pass successfully.
• Edge cases introduced by stricter type checking are covered.
  Closes Implement TypeScript strict mode for type safety #372

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