Add diff-guard — Impact-aware API contract enforcement engine

[Aryan0628]

Open Source Hackathon 2026 Project Submission

Participant Details

Full Name:
Aryan Gupta

GitHub Username:
Aryan0628

Team Name:
NULLPOINTER

College/University:
MNNIT Allahabad

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Project Details

Project Title:
diff-guard

Project Description:
diff-guard is an impact-aware git diff engine that uses WASM-compiled Tree-Sitter grammars to detect breaking API changes before they ship. Standard git diff only shows added or removed text lines — it cannot tell if a required parameter was removed, a return type changed, or a function was made async. diff-guard parses both sides of a git diff into abstract syntax tree (AST) signatures, classifies every structural change against 26 strict production rules, and traces every affected call site across the codebase to show exactly what breaks and who is impacted. It ships with built-in Husky git hooks that block git push and git merge when breaking changes are detected, and auto-posts audit reports as GitHub PR comments in CI. Zero configuration required — install it and it works.

Tech Stack Used:
TypeScript, Node.js, WASM Tree-Sitter (tree-sitter-typescript, tree-sitter-javascript, tree-sitter-python, tree-sitter-go, tree-sitter-java, tree-sitter-rust), Vitest, Husky, GitHub Actions, Next.js 16, React 19, Tailwind CSS v4

GitHub Repository Link:
https://github.com/Aryan0628/diffguardian

Live Demo Link:
https://diffguardian.vercel.app/

Presentation / Demo Video Link:
https://drive.google.com/file/d/141_-ZgoLyJterOePAaGIEAGnEQsJqb1P/view?usp=sharing

npm Package:
https://www.npmjs.com/package/@aryan28/diff-guard

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Open Source Readiness

• My project is public on GitHub
• My repository has a proper README.md
• I have added setup/installation instructions
• I have added screenshots/demo where possible
• I have added a license file
• My project is original and built/updated during the hackathon period

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Additional Information

For any clarification, feel free to reach out at aryan072806@gmail.com
I can also provide a walkthrough video of the tool in action if required.

[AkshitTiwarii]

@Aryan0628 Nice work man

[AkshitTiwarii]

@Aryan0628
Apply your project here
https://summerofcode.xyz/apply?ref=scsnkjnpj

[Aryan0628]

Thank you so much sir!!!
It means a lot to me