Add ESLint and Prettier with a lint gate in CI

[mikewheeleer]

Implement ESLint and Prettier with a CI lint gate

Description

The repo has no linter or formatter: package.json defines only build, start, dev, and test scripts, and .github/workflows/ci.yml runs npm ci, build, and test but no lint step. Several issues in this campaign reference npm run lint, which does not yet exist. This issue establishes consistent linting and wires it into CI.

Requirements and context

• Repository scope: Agentpay-Org/Agentpay-backend only.
• Add ESLint (typescript-eslint) and Prettier configs appropriate for the NodeNext/ES2022/strict setup in tsconfig.json.
• Add lint and format scripts to package.json (eslint . --ext .ts, prettier --check).
• Fix or annotate any existing violations in src/index.ts and src/health.test.ts so the gate passes clean.
• Add a lint step to .github/workflows/ci.yml before build/test.

Suggested execution

• Fork the repo and create a branch
• git checkout -b feature/ci-30-eslint-prettier
• Implement changes
  • Write code in: new .eslintrc/eslint.config.js and .prettierrc; update package.json and .github/workflows/ci.yml.
  • Write comprehensive tests in: the lint run itself serves as the gate; ensure npm test stays green.
  • Add documentation: document npm run lint/npm run format in the Commands table of README.md.
  • Keep rules pragmatic (no churn-only rules) and aligned with the existing style.
  • Validate security assumptions: enable rules that catch unsafe patterns (no-floating-promises, no-explicit-any where avoidable).
• Test and commit

Test and commit

• Run npm run lint, npm run build, and npm test.
• Confirm CI runs lint and fails on a deliberately introduced violation (then revert it).
• Include the full lint + test output in the PR description.

Example commit message

chore: add eslint and prettier with a ci lint gate

Guidelines

• Minimum 95 percent test coverage for impacted modules (where applicable).
• Clear, reviewer-focused documentation.
• Timeframe: 96 hours.

Community & contribution rewards

• 💬 Join the AgentPay community on Discord for questions, reviews, and faster merges: https://discord.gg/eXvRKkgcv
• ⭐ This is a GrantFox OSS / Official Campaign task and may be rewarded. When your PR is merged you'll be prompted to rate the project — if this issue and the maintainers helped you ship, we'd be grateful for a 5-star rating. Clear questions in Discord and tidy, well-tested PRs are the fastest path to a merge and a reward.

[ZuLu0890]

I would love work on this issue

[Chigybillionz]

Hello maintainer
I would like to work on this issue.

Experience:
I have experience with TypeScript, Node.js, ESLint, Prettier, GitHub Actions, CI/CD pipelines, and code quality automation. I have set up linting and formatting standards across multiple projects, integrated them into CI workflows, and resolved existing codebase violations while maintaining development velocity.

Implementation:
I will configure ESLint ("typescript-eslint") and Prettier to align with the repository's NodeNext, ES2022, and strict TypeScript setup. I will add lint and format scripts, resolve existing violations in the codebase, integrate lint checks into the CI workflow before build and test execution, and document the new commands in the README. I will also enable practical safety-focused rules such as "no-floating-promises" and minimize unnecessary style churn.

Delivery:
I can complete the implementation, validation, documentation updates, and submit a clean PR well within the 96-hour timeframe, including lint/build/test results and CI verification in the PR description.

Additional Note:
I have already joined the AgentPay community and can coordinate through Discord for feedback and reviews during implementation.

GitHub:
https://github.com/chigybillionz

[grantfox-oss]

🦊 GrantFox — @Chigybillionz has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #60)
2. Your PR will be reviewed by the Agentpay-Org maintainers

Good luck! Track your progress on GrantFox.