Tech Analyze Bumps

Tech: Analyze Dependabot Bumps

Automates analysis of Dependabot PRs to generate a risk-categorized merge plan.

When to Use This Skill

• Weekly Dependabot PR review
• Before deploying to Vercel prod
• When multiple dependency updates accumulate
• To prioritize which PRs to merge first

What This Skill Does

1. Fetch PRs: Uses gh pr list to get all open Dependabot PRs on FlorianBruniaux/starmapper
2. Analyze Each PR:
   • Parses version bump (major/minor/patch via semver)
   • Identifies dependency type (deps vs devDeps from package.json)
   • Checks CI status (passed/failed)
3. Risk Categorization:
   • 🟢 LOW: devDeps minor bumps (TypeScript, ESLint, Prettier, Vitest)
   • 🟡 MEDIUM: deps minor bumps (Next.js minor, Tailwind, Prisma client)
   • 🔴 HIGH: Major version bumps (MapLibre GL, Next.js major, Prisma major)
   • 🚨 CRITICAL: Neon adapter + Prisma pair mismatches (runtime crash risk)
4. Generate Merge Plan: Sequential phases with verification commands

How to Use

Basic Usage

/tech-analyze-bumps

This will:

• Scan all open Dependabot PRs on FlorianBruniaux/starmapper
• Run scripts/analyze_bumps.py to generate the report
• Output risk-categorized markdown with merge plan

Output Example

## 📊 Dependabot Bump Analysis

### 🟢 LOW RISK (3 PRs)

- #42: typescript 5.4.0 → 5.5.2 (devDep minor)
- #41: eslint 9.1.0 → 9.3.0 (devDep minor)

### 🟡 MEDIUM RISK (2 PRs)

- #45: next 15.1.0 → 15.2.0 (dep minor)
- #44: tailwindcss 4.0.0 → 4.1.0 (dep minor)

### 🔴 HIGH RISK (1 PR - Breaking Changes)

- #47: maplibre-gl 4.7.0 → 5.0.0 (major — MapLibre visual regression risk)

### 🚨 CRITICAL (1 PR - Neon adapter sync)

- #48: @prisma/adapter-neon 7.0.0 → 7.1.0 without prisma 7.1.0 → mismatch risk

## 🎯 Merge Plan

### Phase 1: DevDeps (LOW)

1. Merge #42, #41
2. Run: `rtk tsc && pnpm lint`

### Phase 2: Runtime Minor (MEDIUM)

3. Merge #45 (check Vercel build)
4. Merge #44 (verify Tailwind v4 theme tokens)

### Phase 3: Major Bumps (HIGH)

5. Create branch `chore/maplibre-v5-bump`
6. Merge #47, test map rendering + cluster interactions

### Phase 4: Critical (Prisma sync)

7. Merge Prisma + adapter pair together
8. Run `npx prisma generate && rtk tsc`

Risk Classification Rules (StarMapper-specific)

🟢 LOW RISK

• Criteria: devDeps AND minor/patch bump
• Examples: TypeScript, ESLint, Prettier, Vitest, @types/*
• Action: Merge all at once, rtk tsc check

🟡 MEDIUM RISK

• Criteria: Runtime deps AND minor bump
• Examples: Next.js minor, Tailwind v4 minor, Zod minor
• Action: Merge individually, verify build on localhost

🔴 HIGH RISK

• Criteria: Major version bump
• Categories:
  • MapLibre GL: API breaking changes (check getClusterExpansionZoom Promise API, layer paint properties)
  • Next.js major: App Router breaking changes, middleware changes
  • Prisma major: Schema model changes, adapter API changes
  • Neon adapter: Connection pooling API changes
• Action: Create chore/<name>-bump branch, test locally before PR

🚨 CRITICAL

• Criteria: Prisma + @prisma/adapter-neon version mismatch, OR major bump to either
• Why: Mismatched versions cause silent runtime crashes on Vercel (no build error, fails at query time)
• Action: Always merge prisma + @prisma/adapter-neon together in the same commit

CI Failure Detection

If ALL PRs have failing checks:

⚠️ OBSERVATION CRITIQUE

TOUTES les PRs ont des checks qui échouent (X/Y failed).
Cela indique probablement :

- Problème TypeScript global (rtk tsc pour diagnostiquer)
- Conflit de versions entre dépendances
- Build Next.js cassé

AUCUNE PR ne peut être mergée sans risque dans l'état actuel.

Action: rtk tsc en local pour diagnostiquer avant de merger quoi que ce soit.

Verification Commands

After each merge phase:

# Type check (always first)
rtk tsc

# Lint
pnpm lint

# Unit tests
pnpm test

# Prisma regeneration (if Prisma or adapter bumped)
npx prisma generate
rtk tsc  # Re-verify after generate

# Visual check (MapLibre or UI deps)
pnpm dev  # Open localhost:3000, test map + cluster + popups

Special Cases (StarMapper)

Prisma + Neon Adapter Sync

• Always merge together: prisma (devDep) + @prisma/adapter-neon (dep)
• Reason: Version mismatch → runtime crash at first Prisma query (no build error)
• Detection: Both PRs present → flag as "must sync"
• Post-merge: npx prisma generate && rtk tsc

MapLibre GL Major

• Risk: Breaking changes in cluster API (v4→v5 made getClusterExpansionZoom Promise-based)
• Action: Create branch chore/maplibre-vX-bump, test:
  1. Map renders correctly
  2. Cluster click → expansion zoom works
  3. Popup opens with correct stargazer data
  4. 2D/3D toggle works (globe projection)

Next.js Major

• Risk: App Router, Server Actions, middleware API changes
• Action: Read migration guide, test chunk loop end-to-end (small repo < 100 stars)

Example Workflow

# Weekly review
/tech-analyze-bumps

# Phase 1: Merge LOW (devDeps)
gh pr merge 42 --squash
gh pr merge 41 --squash
rtk tsc  # ✅ Pass

# Phase 2: MEDIUM individually
gh pr merge 45 --squash
pnpm build  # ✅ Next.js build OK

# Phase 3: HIGH (MapLibre)
git checkout -b chore/maplibre-v5-bump
gh pr checkout 47
pnpm dev
# Test: map renders, clusters work, popups open → ✅

# Phase 4: CRITICAL (Prisma sync)
gh pr merge 48 --squash  # Merge adapter + prisma together
npx prisma generate
rtk tsc  # ✅ 0 errors

Tips

• Run weekly: Monday mornings
• Batch LOW: Merge all devDeps minor bumps at once
• Never batch MEDIUM: Runtime deps individually (easier rollback)
• Branch for HIGH: Never merge major bumps directly to main
• Prisma sync: Non-negotiable — always pair the two together