Paths: File paths (shared/, references/, ../ln-*) are relative to skills repo root. If not found at CWD, locate this SKILL.md directory and go up one level for repo root. If shared/ is missing, fetch files via WebFetch from https://raw.githubusercontent.com/levnikolaevich/claude-code-skills/master/skills/{path}.

ln-821-npm-upgrader

Type: L3 Worker Category: 8XX Optimization

Upgrades Node.js dependencies using npm, yarn, or pnpm with automatic breaking change detection and migration.

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Overview

Aspect	Details
Input	Project path, package manager type, upgrade policy
Output	Updated package manifest and a machine-readable dependency upgrade summary
Supports	npm, yarn (classic and berry), pnpm

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Workflow

Phases: Pre-flight -> Analyze -> Security Audit -> Check Outdated -> Identify Breaking -> Apply Upgrades -> Apply Migrations -> Verify Build -> Report

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Phase 0: Pre-flight Checks

Check	Required	Action if Missing
package.json	Yes	Block upgrade
Lock file (package-lock.json, yarn.lock, pnpm-lock.yaml)	No	Warn and regenerate before final verification
Package manager available	Yes	Block upgrade
Workspace baseline safe	Yes	In managed runs coordinator already prepared it; in standalone runs protect rollback locally

Runtime Coordination

Managed runs receive deterministic runId and exact summaryArtifactPath from ln-820. Standalone runs remain supported; if runtime arguments are omitted, generate a standalone run-scoped artifact before returning.

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Phase 1: Analyze Dependencies

Read package.json and categorize dependencies for upgrade priority.

Category	Examples	Priority
peer	typescript, @types/*	1
framework	react, vue, next	2
build	vite, webpack, esbuild	3
ui	@radix-ui/*, tailwindcss	4
state	@tanstack/react-query, zustand	5
utils	lodash, date-fns	6
dev	eslint, prettier, test tooling	7

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Phase 2: Security Audit

Manager	Command
npm	npm audit --audit-level=high
yarn	yarn audit --level high
pnpm	pnpm audit --audit-level high

Actions:

Severity	Action
Critical	Block and report
High	Warn and continue
Moderate/Low	Log only

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Phase 3: Check Outdated

Manager	Command
npm	npm outdated --json
yarn	yarn outdated --json
pnpm	pnpm outdated --json

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Phase 4: Identify Breaking Changes

MANDATORY READ: Load breaking_changes_patterns.md for full patterns.

Detection flow:

1. Compare current vs latest major versions.
2. Check shared breaking-change patterns.
3. Query Context7 or Ref for migration guides before changing code.

Common breaking examples:

Package	Breaking Version	Key Changes
react	18 -> 19	JSX transform, refs as props
vite	5 -> 6	ESM-only, newer Node baseline
eslint	8 -> 9	Flat config
tailwindcss	3 -> 4	CSS-first config
typescript	5.4 -> 5.5+	Stricter inference

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Phase 5: Apply Upgrades

Upgrade order:

1. peer dependencies
2. framework packages
3. build tools
4. UI libraries
5. utilities
6. dev dependencies

Manager	Command
npm	npm install <package>@latest --save
yarn	yarn add <package>@latest
pnpm	pnpm add <package>@latest

Peer dependency conflicts:

Situation	Solution
ERESOLVE	npm install --legacy-peer-deps
Still fails	npm install --force only as last resort

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MCP Tools for Migration Search

Priority	Tool	When to Use
1	mcp__context7__query-docs	First choice for library docs
2	mcp__Ref__ref_search_documentation	Official docs and GitHub
3	WebSearch	Latest info and community fixes

Use MCP tools to fetch migration guides before applying non-trivial changes.

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Phase 6: Apply Migrations

1. Use MCP tools to find the current migration guide.
2. Apply automated code transforms only when the guide supports them.
3. Log manual follow-up steps for the final report.

Do not hardcode migrations without checking current documentation.

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Phase 7: Verify Build

Check	Command
TypeScript	npm run check or npx tsc --noEmit
Build	npm run build
Tests	npm test if available

On failure:

1. Identify the failing package.
2. Search Context7 or Ref for the fix.
3. If unresolved, rollback that package and continue with the remaining candidates.

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Phase 8: Report Results

Field	Description
project	Project path
packageManager	npm, yarn, or pnpm
duration	Total time
upgrades.major[]	Breaking changes applied
upgrades.minor[]	Feature updates
upgrades.patch[]	Bug fixes
migrations[]	Applied migrations
skipped[]	Already latest or policy-skipped
verification	Build/test/type-check verdict
warnings[]	Non-blocking issues
artifact_path	Durable worker report path, if written

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Configuration

Options:
  upgradeType: major          # major | minor | patch
  allowBreaking: true
  autoMigrate: true
  queryMigrationGuides: true
  auditLevel: high
  minimumReleaseAge: 14
  legacyPeerDeps: false
  force: false
  runBuild: true
  runTests: false
  runTypeCheck: true
  rollbackOnFailure: true

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Error Handling

Error	Cause	Solution
ERESOLVE	Peer dependency conflict	Retry with legacy peer dependency mode
ENOENT	Missing lock file	Regenerate dependencies first
Build fail	Breaking change	Apply migration guide or rollback offending package
Type errors	Version mismatch	Update types or framework peer packages

Rollback: Restore package.json and the lock file, then run a clean install to restore the previous state.

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References

• breaking_changes_patterns.md
• npm_peer_resolution.md

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Runtime Summary Artifact

MANDATORY READ: Load shared/references/coordinator_summary_contract.md

Emit a dependency-worker summary envelope.

Managed mode:

• ln-820 passes deterministic runId and exact summaryArtifactPath
• write the summary to the provided summaryArtifactPath

Standalone mode:

• omit runId and summaryArtifactPath
• write .hex-skills/runtime-artifacts/runs/{run_id}/dependency-worker/ln-821--{identifier}.json

Monitor (2.1.98+): For install/audit/build/test commands expected >30s, use Monitor. Fallback: Bash(run_in_background=true).

Definition of Done

• Package manifest analyzed and dependencies prioritized
• Security audit completed for the selected package manager
• Outdated packages identified
• Breaking changes checked via patterns plus current docs
• Upgrades applied with rollback on failure
• Build and relevant verification commands pass after upgrades
• dependency-worker summary artifact written to the managed or standalone path

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Version: 1.1.0 Last Updated: 2026-01-10