A CLI tool that verifies preconditions, postconditions, and invariants in contracts without altering their original source code. contract-shield-cli enforces Design by Contract principles externally, ensuring contracts behave as expected while preserving their integrity.

• Precondition Validation (@pre) – Ensures input conditions are met before execution.
• Postcondition Verification (@post) – Confirms expected results after execution.
• Invariant Checking (@invariant) – Maintains logical consistency across operations.
• Source Code Integrity – Works externally without modifying the original code.

To install contract-shield-cli, use:

npm install -g contract-shield-cli

Given the following contract source code:

/**
 * Example function with validation tags
 * @pre amount > 0
 * @post balance == previousBalance - amount
 * @post balance >= 0
 */
function withdraw(amount) {
}

The tool will generate a modified version of the contract that enforces these conditions

• Fork the repository.
• Create a feature branch (git checkout -b feature-branch).
• Commit changes (git commit -m "Add feature").
• Push to GitHub (git push origin feature-branch).
• Open a Pull Request.

This project is licensed under the MIT License. See LICENSE for details.