Dependency Evaluation

Evaluate Node.js packages before installation to make informed decisions about bundle size, maintenance status, and alternatives.

Evaluation Workflow

For every dependency addition request, follow these steps:

Evaluation Progress:
- [ ] Step 1: Identify need and alternatives
- [ ] Step 2: Check bundle sizes (bundlephobia)
- [ ] Step 3: Verify latest versions (npm registry)
- [ ] Step 4: Assess maintenance status
- [ ] Step 5: Compare and recommend
- [ ] Step 6: Install with latest stable version

Step 1: Identify Need and Alternatives

If specific package requested (e.g., "add lodash"):

• Proceed to Step 2 with that package
• Consider mentioning well-known alternatives if relevant

If generic need (e.g., "add a date library"):

• Identify 2-4 popular alternatives in that category
• Examples:
  • Date handling: date-fns, dayjs, luxon
  • HTTP client: axios, ky, got
  • State management: zustand, jotai, redux
  • Validation: zod, yup, joi
  • Testing: vitest, jest, uvu

Step 2: Check Bundle Sizes

Use bundlephobia to check bundle size impact:

# Check bundle size via bundlephobia
curl -s "https://bundlephobia.com/api/size?package=<package>@latest" | jq

Extract key metrics:

• size - Minified size
• gzip - Gzipped size (most important for actual impact)
• dependency_count - How many dependencies it pulls in

For multiple alternatives, compare:

# Example: Compare date libraries
curl -s "https://bundlephobia.com/api/size?package=dayjs@latest" | jq '.gzip'
curl -s "https://bundlephobia.com/api/size?package=date-fns@latest" | jq '.gzip'
curl -s "https://bundlephobia.com/api/size?package=luxon@latest" | jq '.gzip'

Step 3: Verify Latest Versions

Check npm registry for latest version:

# Get latest version
npm view <package> version

# Get version info with dates
npm view <package> time --json | jq '.modified'

# Check for deprecated status
npm view <package> deprecated

Check multiple versions:

# See all versions
npm view <package> versions --json

# Get latest major versions
npm view <package> dist-tags --json

Step 4: Assess Maintenance Status

Check package health:

# Last publish date
npm view <package> time.modified

# Weekly downloads (popularity)
npm view <package> dist.tarball | xargs -I {} curl -s "https://api.npmjs.org/downloads/point/last-week/{}"

# Check repository activity (if GitHub URL available)
npm view <package> repository.url

Red flags:

• ❌ Last updated >2 years ago
• ❌ Marked as deprecated
• ❌ Security vulnerabilities (check npm audit after install)
• ❌ Very low download count (<1000/week)

Green flags:

• ✅ Updated within last 6 months
• ✅ Active maintenance (regular releases)
• ✅ High download count
• ✅ TypeScript support built-in

Step 5: Compare and Recommend

Present comparison in this format:

Package Evaluation Results:

Option 1: <package-name> (recommended)
- Bundle size: X KB gzipped
- Latest version: X.X.X
- Last updated: X months ago
- Weekly downloads: XXX,XXX
- TypeScript: ✅ Built-in / ⚠️ @types required / ❌ None
- Why: [Brief reason - smallest/fastest/most maintained/best DX]

Option 2: <alternative>
- Bundle size: X KB gzipped (XX% larger)
- Latest version: X.X.X
- Last updated: X months ago
- Why not: [Brief reason - larger/older/less maintained]

Recommendation: Install <package>@<version>

Decision criteria (in order of importance):

1. Maintenance - Is it actively maintained?
2. Bundle size - How much does it add to the bundle?
3. Popularity - Is it widely used and trusted?
4. TypeScript - Does it have good type support?
5. Features - Does it meet the requirements?

Step 6: Install with Latest Stable Version

Detect package manager first:

if [ -f "bun.lockb" ]; then
    PM="bun"
elif [ -f "pnpm-lock.yaml" ]; then
    PM="pnpm"
elif [ -f "yarn.lock" ]; then
    PM="yarn"
else
    PM="npm"
fi
echo "Using: $PM"

Install with explicit version:

# npm
npm install <package>@<version>

# pnpm
pnpm add <package>@<version>

# yarn
yarn add <package>@<version>

# bun
bun add <package>@<version>

For dev dependencies, add -D flag:

npm install -D <package>@<version>
pnpm add -D <package>@<version>
yarn add -D <package>@<version>
bun add -d <package>@<version>

Quick Reference Tables

Common Package Categories

Bundle Size Thresholds

Special Cases

TypeScript Projects

Prefer packages with built-in types:

• ✅ zod - Types built-in
• ⚠️ joi - Needs @types/joi

Check for types:

npm view <package> types
# or check for @types package
npm view @types/<package> version

Monorepo/Workspaces

For workspace dependencies:

# npm
npm install <package> --workspace=packages/web

# pnpm
pnpm add <package> --filter packages/web

# yarn
yarn workspace packages/web add <package>

Alternative: Tree-shakeable Imports

Some large libraries support tree-shaking:

// ❌ Bad - imports entire library
import _ from 'lodash'

// ✅ Good - tree-shakeable
import debounce from 'lodash-es/debounce'

Anti-Patterns

❌ Installing Without Version Check

# Bad - might get old cached version
npm install lodash

# Good - explicit latest version
npm install [email protected]

❌ Not Considering Bundle Size

Don't install moment.js (289 KB) when dayjs (2.9 KB) would work.

❌ Not Checking Maintenance

Avoid deprecated or unmaintained packages:

• request (deprecated, use got or ky)
• moment (maintenance mode, use dayjs or date-fns)

❌ Adding Unnecessary Dependencies

Before adding a package, check if:

• Native JavaScript can do it (e.g., Date API instead of date library for simple cases)
• It's already in dependencies (check package.json)
• A lighter alternative exists

Examples

Example 1: Generic Request

User: "Add a date library"

Evaluation:

1. Alternatives: dayjs, date-fns, luxon
2. Bundle sizes: dayjs (2.9 KB), date-fns (13 KB), luxon (25 KB)
3. Latest: [email protected], [email protected], [email protected]
4. All actively maintained
5. Recommend: dayjs (smallest, good DX)
6. Install: npm install [email protected]

Example 2: Specific Package

User: "Add axios"

Evaluation:

1. Package: axios (requested), alternatives: ky, got
2. Bundle: axios (13 KB), ky (4.8 KB), got (Node.js only)
3. Latest: [email protected]
4. Very active, 50M+ downloads/week
5. Recommend: axios (as requested, widely used)
6. Install: npm install [email protected]

Example 3: Optimization Request

User: "Our bundle is too large, what can we optimize?"

Evaluation:

1. Check package.json for heavy dependencies
2. Run bundlephobia on top packages
3. Identify candidates: moment (289 KB) → dayjs (2.9 KB)
4. Suggest: "Replace moment with dayjs, saves 286 KB"
5. Migration guide if needed

References

External tools:

• Bundlephobia - Bundle size checker
• npm trends - Compare package popularity
• Snyk Advisor - Package health scores

For package manager commands: See node-package-management skill