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Provides dependency management and supply chain security practices for auditing vulnerabilities, checking licenses, assessing dependency health, and managing upgrades safely. Use when auditing packages, reviewing security, managing dependencies, or when user mentions 'audit', 'vulnerability', 'dependency', 'supply chain', 'npm audit', 'license', 'bundle size'.
type
skill
category
patterns
status
stable
origin
tibsfox
modified
false
first_seen
"2026-02-07T00:00:00.000Z"
first_path
examples/dependency-audit/SKILL.md
superseded_by
null
Dependency Audit
Read-only analysis patterns for dependency security, license compliance, and health assessment. This skill does NOT auto-upgrade packages -- it helps you understand your dependency landscape and make informed decisions.
Security-First Principles
Principle
Practice
Audit before merge
Run security checks in CI on every PR
Understand before upgrading
Read changelogs, check breaking changes
Never blindly force-fix
npm audit fix --force can introduce breaking changes
# Example npm audit output
┌───────────────┬──────────────────────────────────────────────┐
│ Severity │ high │
├───────────────┼──────────────────────────────────────────────┤
│ Package │ lodash │
│ Dependency of │ my-library │
│ Path │ my-library > lodash │
│ More info │ https://github.com/advisories/GHSA-xxxx-xxxx │
└───────────────┴──────────────────────────────────────────────┘
Step 3: Assess Each Vulnerability
Severity
CVSS Score
Action
Critical
9.0-10.0
Fix immediately, block deployment
High
7.0-8.9
Fix within 24 hours
Moderate
4.0-6.9
Fix within 1 week, assess exploitability
Low
0.1-3.9
Track, fix in next maintenance window
Info
0
Informational, no action required
Step 4: Determine Fix Strategy
# SAFE: See what non-breaking fixes are available
npm audit fix --dry-run
# SAFE: Apply only semver-compatible fixes
npm audit fix
# DANGEROUS: Never run without understanding consequences# npm audit fix --force <-- CAN INTRODUCE BREAKING CHANGES# INVESTIGATE: When audit fix doesn't resolve
npm ls <vulnerable-package> # See dependency tree
npm explain <vulnerable-package> # See why it's installed
Step 5: Handle Unresolvable Vulnerabilities
When a vulnerability exists in a transitive dependency with no fix available:
# Check if the vulnerable code path is actually used# Read the advisory -- is it relevant to your usage?# Option A: Override the transitive dependency (npm)# In package.json:
{
"overrides": {
"vulnerable-package": ">=fixed-version"
}
}
# Option B: Override the transitive dependency (yarn)# In package.json:
{
"resolutions": {
"vulnerable-package": ">=fixed-version"
}
}
# Option C: Exclude from audit (document why)# Create .nsprc or use npm audit --omit=dev for dev-only deps
Third-Party Scanning Tools
Tool
Type
Best For
npm audit
Built-in
Quick check, CI integration
Snyk
SaaS + CLI
Deep analysis, fix PRs, monitoring
Socket.dev
SaaS + CLI
Supply chain attack detection
Dependabot
GitHub native
Automated update PRs
Renovate
Self-hosted/SaaS
Highly configurable update PRs
OSV-Scanner
CLI
Google's vulnerability database
Snyk CLI Usage
# Install
npm install -g snyk
# Authenticate
snyk auth
# Test for vulnerabilities (read-only)
snyk test# Monitor project (sends to dashboard)
snyk monitor
# Test a specific package before installing
snyk test <package-name>
# View package metadata
npm view <package-name>
# Check when last published
npm view <package-name> time --json | jq 'to_entries | sort_by(.value) | last'# See who maintains it
npm view <package-name> maintainers
# Check download counts (popularity signal)
npm view <package-name> --json | jq '.dist-tags, .versions | length'# List all postinstall scripts in dependencies
npm ls --json | jq '.. | .scripts?.postinstall? // empty'# Check package size before installing
npx package-phobia <package-name>
Before Adding a New Dependency
Ask these questions before npm install:
Is this package actively maintained? (Commits in last 6 months)
Does it have more than one maintainer?
Are there open, unresolved security issues?
Is the license compatible with my project?
What is the install size and bundle size impact?
Does it have post-install scripts? Are they necessary?
Could I implement this functionality in <50 lines?
Is this a direct dependency or could it be a devDependency?
Safe Upgrade Strategy
The Read-Analyze-Test-Upgrade Cycle
Never upgrade blindly. Follow this cycle for each upgrade.
Step 1: Identify Available Updates
# See what's outdated (read-only)
npm outdated
# More detail
npm outdated --long
# Output:# Package Current Wanted Latest Location# express 4.18.2 4.18.3 5.0.0 my-app# lodash 4.17.20 4.17.21 4.17.21 my-app
Step 2: Categorize Updates
Update Type
Version Change
Risk
Example
Patch
x.y.Z
Low
4.18.2 -> 4.18.3 (bug fixes)
Minor
x.Y.z
Medium
4.18.2 -> 4.19.0 (new features)
Major
X.y.z
High
4.18.2 -> 5.0.0 (breaking changes)
Step 3: Read Changelogs
# Check the changelog before upgrading
npm view <package-name> repository.url
# Then visit the repo and read CHANGELOG.md or Releases
Step 4: Upgrade in Isolation
# Upgrade one package at a time
npm install <package-name>@<version>
# Run tests immediately
npm test# Check for type errors (TypeScript)
npx tsc --noEmit
# Check for lint issues
npm run lint
Step 5: Verify and Commit
# Verify the lock file changed as expected
git diff package-lock.json | head -50
# Commit the single upgrade
git add package.json package-lock.json
git commit -m "chore(deps): upgrade <package> to <version>"
Lock File Hygiene
Why Lock Files Matter
Concern
Without Lock File
With Lock File
Reproducibility
Different versions on each install
Exact same versions every time
Security
Can get compromised newer version
Pinned to known-good versions
CI reliability
"Works on my machine"
Same everywhere
Audit accuracy
Audit results vary
Consistent audit results
Lock File Rules
Rule
Rationale
Always commit lock files
Ensures reproducible builds
Use npm ci in CI, not npm install
ci respects lock file exactly
Review lock file diffs in PRs
Catch unexpected transitive changes
Regenerate periodically
Clear accumulated cruft
Never manually edit lock files
Use npm/yarn commands instead
# CORRECT: Clean install from lock file (CI)
npm ci
# CORRECT: Install and update lock file (development)
npm install
# WRONG: Deleting lock file to "fix" issues# rm package-lock.json && npm install <-- loses pinned versions
Bundle Size Analysis
Measuring Impact
# Check bundle size of a package (before installing)
npx bundlephobia <package-name>
# Analyze your bundle
npx webpack-bundle-analyzer dist/stats.json
# Check what's in node_modules
npx cost-of-modules
# Compare alternatives
npx bundlephobia lodash vs ramda vs lodash-es
Size Budget Rules
Metric
Budget
Tool
Initial JS bundle
< 200KB gzipped
Webpack/Vite analyzer
Single dependency
< 50KB gzipped
bundlephobia
Total node_modules
Monitor trend
du -sh node_modules
Install time
< 30s
time npm ci
Reducing Bundle Size
Strategy
Example
Import specific functions
import debounce from 'lodash/debounce' not import { debounce } from 'lodash'
Use tree-shakeable packages
lodash-es instead of lodash
Check for smaller alternatives
date-fns vs moment (tree-shakeable)
Lazy load heavy dependencies
const lib = await import('heavy-lib')
Avoid duplicate packages
Check npm ls <pkg> for multiple versions
CI Integration
Audit in CI Pipeline
name:DependencyAuditon:pull_request:paths:-'package.json'-'package-lock.json'schedule:# Run weekly audit on Monday mornings-cron:'0 8 * * 1'jobs:audit:runs-on:ubuntu-latestpermissions:contents:readsteps:-uses:actions/checkout@v4-uses:actions/setup-node@v4with:node-version:20cache:npm-run:npmci-name:Securityauditrun:npmaudit--audit-level=high-name:Licensecheckrun:npxlicense-checker--production--failOn"GPL-2.0;GPL-3.0;AGPL-3.0"-name:Checkforoutdated(informational)run:npmoutdated||true
Anti-Patterns
Anti-Pattern
Problem
Fix
npm audit fix --force
Introduces breaking major version bumps
Use npm audit fix (safe) and handle majors manually
Ignoring audit warnings
Vulnerabilities accumulate
Triage every audit finding, document accepted risks
"*" or "" version ranges
Installs any version, including malicious
Use exact versions or ^ ranges with lock file
Not committing lock file
Non-reproducible builds
Always commit package-lock.json / yarn.lock
Deleting lock file to fix issues
Loses all version pins
Diagnose the actual issue, regenerate carefully
Installing without reviewing
Supply chain attack vector
Check package health before npm install
Bulk upgrading all at once
Hard to diagnose breakage
Upgrade one package at a time, test between each
Running npx with unknown packages
Executes unreviewed code
Verify package before first npx usage
Ignoring post-install scripts
Arbitrary code execution
Review scripts, use --ignore-scripts when cautious
No CI audit step
Vulnerabilities ship to production
Add npm audit to CI pipeline
Using deprecated packages
No security patches
Find maintained alternatives
devDependencies in production
Larger attack surface, bigger image
Use npm ci --omit=dev for production builds
Quick Reference: Audit Decision Tree
npm audit reports vulnerability
|
+--> Is it in a devDependency only?
| YES --> Lower priority (not in production)
| NO --> Continue
|
+--> Is there a patch/minor fix available?
| YES --> npm audit fix (safe)
| NO --> Continue
|
+--> Is the vulnerable code path used in your app?
| NO --> Document accepted risk, revisit monthly
| YES --> Continue
|
+--> Is there a major version fix?
| YES --> Read changelog, test upgrade in branch
| NO --> Continue
|
+--> Can you use overrides/resolutions?
| YES --> Pin transitive dep to fixed version
| NO --> Continue
|
+--> Find alternative package or implement inline
