Architecture

lazypr is a Bun monorepo with a GitHub Action entrypoint bundled for Node.js.

Packages

• apps/github-action: GitHub Action entrypoint (reads inputs, calls GitHub APIs, updates PR)
• packages/core: diff fetching helpers, diff sanitization, token truncation, ghost commit detector
• packages/ai-engine: LLM orchestration, impact scoring, checklist generation
• packages/config-presets: built-in prompt presets

Runtime flow

flowchart TD
  ghEvent[GitHubEvent pull_request] --> action[apps/github-action]
  action -->|compare diff| ghCompare[GitHubCompareAPI]
  action -->|sanitize+truncate| coreSanitize[packages/core DiffSanitizer+TokenManager]
  action -->|prompt+LLM| aiEngine[packages/ai-engine generatePRSummar]
  action -->|list commits| ghCommits[GitHubPullsAPI listCommits]
  action -->|per-commit diff| ghCommitDiff[GitHubCommitsAPI diff]
  action -->|ghost detection| coreGhost[packages/core GhostCommitDetector]
  action -->|update PR body| ghUpdate[GitHubPullsAPI update]
  action -->|labels| ghLabels[GitHubIssuesAPI labels]

Notes

• Diff sanitization: lockfiles and non-code assets are filtered out before sending to the LLM.
• Token truncation: high-risk files are prioritized when truncating to provider context limits.
• Impact scoring: based on file path pattern matching to produce an impact score (0–100) and risk level.
• Ghost commits: compares commit message keywords to the commit’s diff. Limited to the most recent 20 commits.