update-pkg-extended

Update package.json with ease - Now with isomorphic support! 🌐

A Node.js ES module library for programmatically reading, modifying, and writing package.json files with advanced version management capabilities.

✨ Now with isomorphic support! Use in browsers, serverless environments, or any JavaScript runtime without filesystem dependencies.

Features

• 🌐 Isomorphic: Works in browsers, Node.js, serverless, and any JavaScript environment
• 📁 Filesystem Support: Optional Node.js filesystem operations for traditional workflows
• 🎯 Version Management: Advanced semantic version manipulation with prerelease support
• 🔗 Method Chaining: Fluent API for streamlined package.json manipulation
• 🔧 Dot Notation: Deep property access using dot notation (e.g., author.name)
• 📦 TypeScript: Full TypeScript support with comprehensive type definitions
• 🧪 100% Test Coverage: Thoroughly tested with comprehensive test suite

Install

npm install --save update-pkg-extended

or

yarn add update-pkg-extended

or

pnpm add update-pkg-extended

Note: This package is an ES module and requires Node.js 18 or higher.

Usage

Isomorphic Core (Works Everywhere)

Use the isomorphic core to manipulate package.json data without filesystem dependencies:

import { Pkg } from 'update-pkg-extended/core'

// Create from existing package.json data
const packageData = {
  name: 'my-package',
  version: '1.0.0',
  description: 'A sample package'
}

const pkg = new Pkg(packageData)

// Manipulate the data
pkg.set('author.name', 'John Doe')
pkg.version.newMinor() // 1.1.0
pkg.append('keywords', 'awesome')

// Get the updated JSON
const updatedJson = pkg.stringify()
console.log(updatedJson)

Node.js with Filesystem (Traditional)

For Node.js environments with filesystem access:

import Pkg from 'update-pkg-extended'

// Traditional usage - reads from filesystem
const pkg = new Pkg()

// Update package.json fields
pkg.set('author.name', 'panz3r')
pkg.version.newMinor()

// Save to filesystem
pkg.saveSync()
// or async
await pkg.save()

Hybrid Approach

Combine isomorphic data manipulation with filesystem operations:

import Pkg from 'update-pkg-extended'

// Start with provided data instead of reading from filesystem
const pkg = new Pkg('.', { 
  data: { name: 'my-app', version: '1.0.0' },
  create: true 
})

// Manipulate the data
pkg.set('description', 'My awesome app')
pkg.version.newPatch()

// Save to filesystem when ready
await pkg.save()

Browser/Serverless Usage

In environments without filesystem access:

import { Pkg } from 'update-pkg-extended/core'

// Fetch package.json from API or other source
const response = await fetch('/api/package-json')
const packageData = await response.json()

// Manipulate the data
const pkg = new Pkg(packageData)
pkg.set('version', '2.0.0')
pkg.set('scripts.build', 'webpack --mode=production')

// Send updated data back to API
const updatedData = pkg.data
await fetch('/api/package-json', {
  method: 'PUT',
  body: JSON.stringify(updatedData),
  headers: { 'Content-Type': 'application/json' }
})

ES Modules (Legacy Documentation)

import Pkg from 'update-pkg-extended'

const pkg = new Pkg()
pkg.data //=> package.json object

// Update package.json fields
pkg.set('author.name', 'panz3r')

// Get version
pkg.version.get() // => '0.0.9'

// Update minor version
pkg.version.newMinor() // => '0.1.0'

// Save synchronously
pkg.saveSync()
// or using Promise
pkg.save().then(/* ... */)

CommonJS

const Pkg = require('update-pkg-extended').default

const pkg = new Pkg()
// ... rest of the usage is the same

API

Entry Points

• update-pkg-extended - Main entry point, exports Node.js version for backward compatibility
• update-pkg-extended/core - Isomorphic core, works in any JavaScript environment
• update-pkg-extended/node - Explicit Node.js version with filesystem operations

new Pkg([data, options])

(From update-pkg-extended/core)

Create a new isomorphic Pkg instance for manipulating package.json data.

data

Type: object
Optional package.json data object.

options

Type: object

data

Type: object
Alternative way to provide package.json data: new Pkg({ data: packageJson })

new Pkg([cwd, options])

Create a new Node.js Pkg instance with filesystem support.

cwd

Type: string
Default: './'

Directory where a package.json can be found or will be created.

options

create

Type: boolean
Default: false

Create package.json when it does not exist.

data

Type: object
Provide package.json data directly instead of reading from filesystem (isomorphic mode).

.data

Type: object
Default: {}

The package.json data object.

.set(keyPath, value)

Set value by the given keyPath using dot notation.

pkg.set('author.name', 'panz3r')
pkg.set('scripts.test', 'ava')

.get(keyPath [,defaultValue])

Get value by the given keyPath. Returns defaultValue if keyPath is not found.

pkg.get('author.name') // => 'panz3r'
pkg.get('nonexistent', 'default') // => 'default'

.update(keyPath, updateFn)

Update keyPath value using updateFn function.
updateFn is invoked with the current keyPath value.

.append(keyPath, value)

Append value to the given keyPath.

.prepend(keyPath, value)

Prepend value to the given keyPath.

.version

Type: Version

Manage version field in a semver-compatible way

.get([segment])

Return formatted version (0.0.3) if segment is not specified, otherwise returns the required segment

segment

Type: string
Default: undefined

Specify required version segment, should be one of major, minor, patch, prerelease or prelease (backward compatibility)

.newMajor()

Increment major version and reset all others fields

pkg.version.get() // => '0.0.3'

// New major version
pkg.version.newMajor() // => '1.0.0'

.newMinor()

Increment minor version and reset patch field

pkg.version.get() // => '0.0.3'

// New minor version
pkg.version.newMinor() // => '0.1.0'

.major([major])

Increment or set major

pkg.version.get() // => '0.0.3'

// Increment major version
pkg.version.major() // => '1.0.3'

// Set major version to specified value
pkg.version.major(3) // => '3.0.3'

.minor([minor])

Increment or set minor version

pkg.version.get() // => '0.0.3'

// Increment minor version
pkg.version.minor() // => '0.1.3'

// Set minor version to specified value
pkg.version.minor(3) // => '0.3.3'

.patch([patch])

Increment or set patch version

pkg.version.get() // => '0.0.3'

// Increment minor version
pkg.version.patch() // => '0.0.4'

// Set minor version to specified value
pkg.version.patch(9) // => '0.0.9'

.prerelease(prereleaseIdentifier, [prereleaseVersion])

Increment or set prerelease version

pkg.version.get() // => '0.0.3'

// Set prerelease version to specified value
pkg.version.prerelease('beta', 9) // => '0.0.3-beta.9'

// Increment prerelease version
pkg.version.prerelease('beta') // => '0.0.4-beta.0'

// Increment prerelease version
pkg.version.prerelease('beta') // => '0.0.4-beta.1'

N.B: Bumping prerelease version when it is not set will also bump patch version

.save()

Type: function
Return: Promise

Save data to package.json.

.saveSync()

Type: function
Return: this

Save data to package.json synchronously.

.stringify([space])

(Available in both isomorphic and Node.js versions)

Type: function
Return: string

Get the package.json content as a formatted JSON string.

space

Type: number
Default: 2

Number of spaces for indentation.

import { Pkg } from 'update-pkg-extended/core'

const pkg = new Pkg({ name: 'test', version: '1.0.0' })
const jsonString = pkg.stringify()
// Returns formatted JSON string with newline at end

Migration Guide

From v5.x to v6.x (Isomorphic Update)

The v6.x release introduces isomorphic support while maintaining full backward compatibility.

Existing Code (Still Works!)

// This continues to work exactly as before
import Pkg from 'update-pkg-extended'

const pkg = new Pkg()
pkg.set('version', '2.0.0')
pkg.saveSync()

New Isomorphic Usage

// For environments without filesystem access
import { Pkg } from 'update-pkg-extended/core'

const pkg = new Pkg({ name: 'my-app', version: '1.0.0' })
pkg.set('description', 'My awesome app')
const updatedJson = pkg.stringify()

Hybrid Usage

// Combine provided data with filesystem operations
import Pkg from 'update-pkg-extended'

const pkg = new Pkg('.', { 
  data: { name: 'my-app', version: '1.0.0' },
  create: true 
})
pkg.set('description', 'Updated')
await pkg.save()

Breaking Changes

None! This release is fully backward compatible.

New Features

• ✨ Isomorphic Core: Import from update-pkg-extended/core for browser/serverless usage
• 🔧 Data Option: Pass package.json data directly via the data option
• 📦 New Entry Points: Access specific functionality via /core and /node sub-imports
• 🎯 stringify() Method: Convert package data to formatted JSON string

Environment Support

Environment	Entry Point	Filesystem	Notes
Node.js	update-pkg-extended	✅	Full traditional support
Browser	update-pkg-extended/core	❌	Isomorphic core only
Serverless	update-pkg-extended/core	❌	Perfect for edge functions
Deno/Bun	update-pkg-extended/core	❌	Use isomorphic core
Web Workers	update-pkg-extended/core	❌	Manipulate data only

TypeScript Support

This project is written in TypeScript and features comprehensive TypeScript support with full type definitions.

Type Definitions

The library exports the following main types:

• Pkg - Available from both core and node entry points (isomorphic or Node.js functionality)
• PkgCore - Isomorphic core class (also exported as Pkg from core entry)
• Version - Version manipulation class
• PkgCoreOptions - Options for creating a core Pkg instance
• PkgOptions - Options for creating a Node.js Pkg instance (extends PkgCoreOptions)
• PackageData - Type definition for package.json structure
• VersionSegment - Type for version segments ('major' | 'minor' | 'patch' | 'prerelease' | 'prelease')

TypeScript Usage

import Pkg, { PkgOptions, VersionSegment } from 'update-pkg-extended'
import { Pkg as CorePkg } from 'update-pkg-extended/core'

// Node.js usage with filesystem
const nodeOptions: PkgOptions = { create: true, data: { name: 'test' } }
const nodePkg = new Pkg('./my-project', nodeOptions)

// Isomorphic usage
const corePkg = new CorePkg({ name: 'isomorphic-pkg', version: '1.0.0' })

// Type-safe version segment access
const segment: VersionSegment = 'major'
const majorVersion = corePkg.version.get(segment)

// Type-safe property setting
corePkg.set('author.name', 'TypeScript Developer')
corePkg.set('engines.node', '>=18')

// Get formatted output
const jsonString: string = corePkg.stringify()

Development

This project uses TypeScript and requires a build step:

Building

# Install dependencies
pnpm install

# Build TypeScript to JavaScript
pnpm run build

# Run tests
pnpm test

# Run tests with coverage
pnpm run coverage

Scripts

• pnpm run build - Compile TypeScript to JavaScript in dist/ folder
• pnpm run clean - Remove compiled dist/ folder
• pnpm test - Build and run all tests
• pnpm run coverage - Run tests with 100% coverage requirement

Credits

• Original codebase credits goes to EGOIST's update-pkg
• Version feature is inspired by ciena-blueplanet's versiony

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Made with ✨ & ❤️ by Mattia Panzeri and contributors