How to fix npm WARN deprecated npm WARN deprecated This command is deprecated. Use npm install instead in npm

npm install -g npm@latest

npm --version
# Should be v9+ or higher

# Old (deprecated)
npm install --save lodash
npm install -S lodash

# New (modern)
npm install lodash

{
  "scripts": {
    "add-dep": "npm install lodash"
  }
}

# Remove shrinkwrap
rm npm-shrinkwrap.json

# Regenerate modern lock file
npm install

# Old (deprecated)
npm install --global-style
npm install --legacy-bundling

# New
npm install --install-strategy=hoisted    # Default
npm install --install-strategy=nested     # Minimal deduplication
npm install --install-strategy=shallow    # Flat structure

# GitHub Actions
- name: Install dependencies
  run: npm ci

- name: Run tests
  run: npm run test

# See which packages are deprecated
npm ls <deprecated-package>

# Update parent packages
npm update parent-package

# Or check for alternatives
npm audit