Improve Types by Replacing 0x${string} With Proper Viem Types

[hanzel98]

📝 Description

Improve type safety throughout the delegation-toolkit codebase by replacing generic 0x${string} type assertions with proper viem types like Hex and Address.

🔄 What Changed?

List the specific changes made:

• Replaced private key types from 0x${string} to Hex in test files
• Updated SignUserOperationReturnType and SignDelegationReturnType from 0x${string} to Hex
• Fixed userOp private key parameter type from 0x${string} to Hex
• Updated deployment address types from 0x${string} to Address for contract addresses
• Replaced delegation authority and salt fields with proper Hex types in tests
• Fixed callData, paymasterData, and factoryData to use Hex type consistently
• Added missing Hex type imports where needed across multiple files
• Preserved intentional test assertions for invalid data validation

🚀 Why?

Explain the motivation behind these changes:

• Improve type safety by using semantic types instead of generic string templates
• Better code clarity - Address vs Hex makes intent explicit (contract addresses vs hex data)
• Align with viem best practices for better ecosystem compatibility
• Reduce potential type-related bugs by leveraging TypeScript's type system more effectively
• Make the codebase more maintainable with proper type semantics

🧪 How to Test?

Describe how to test these changes:

• Manual testing steps:

1. Run yarn clean && yarn build to ensure all packages build successfully
2. Run yarn test to verify all 587 tests pass across all packages
3. Run yarn lint to confirm no type-related linting errors

• Automated tests added/updated
• All existing tests pass

⚠️ Breaking Changes

List any breaking changes:

• No breaking changes
• Breaking changes (describe below):

All changes are internal type improvements that maintain the same runtime behavior and public API.

📋 Checklist

Check off completed items:

• Code follows the project's coding standards
• Self-review completed
• Documentation updated (if needed)
• Tests added/updated
• Changelog updated (if needed)
• All CI checks pass

🔗 Related Issues

Link to related issues:
Closes # (related to type safety improvements)
Related to # (if there are any existing type-related issues)

📚 Additional Notes

• Preserved the standalone Hex type definition in 7715-permission-types package for ERC-7715 standard compliance
• Documentation examples in markdown files were intentionally left unchanged to maintain consistency
• Test files that use intentionally invalid data for validation testing maintain proper type assertions
• All changes maintain backward compatibility while improving type safety
• Future consideration: The 7715-permission-types package could potentially import viem types for even better consistency, but current approach maintains package independence

[jeffsmale90]

Love it!