feat: add package.json devDependencies and npm scripts sync

[Copilot]

Overview

This PR implements the feature requested in #[issue-number] to sync devDependencies and npm scripts from a template package.json file across multiple repositories. This allows organizations to standardize development dependencies and build scripts across their repository portfolio.

Features Added

Two Separate Sync Options

As requested in the issue, this implementation provides two independent options:

1. sync-dev-dependencies - Syncs the entire devDependencies section from a template package.json
2. sync-scripts - Syncs the entire scripts section from a template package.json

These can be used independently or together, giving users full control over what gets synchronized.

Automatic package-lock.json Updates

The tricky part mentioned in the issue has been solved! When syncing devDependencies:

1. The action updates package.json in the target repository
2. Runs npm install --package-lock-only in a temporary directory to generate an updated package-lock.json
3. Commits both files in separate commits within the same PR via the GitHub API
4. All commits are verified since they use the GitHub API

Usage Example

- name: Sync Package.json
  uses: joshjohanning/bulk-github-repo-settings-sync-action@v1
  with:
    github-token: ${{ steps.app-token.outputs.token }}
    repositories-file: 'repos.yml'
    package-json-file: './templates/package.json'
    sync-dev-dependencies: true
    sync-scripts: true
    package-json-pr-title: 'chore: update package.json'

Or sync just devDependencies:

- name: Sync DevDependencies Only
  uses: joshjohanning/bulk-github-repo-settings-sync-action@v1
  with:
    github-token: ${{ steps.app-token.outputs.token }}
    repositories: 'owner/repo1,owner/repo2'
    package-json-file: './templates/package.json'
    sync-dev-dependencies: true
    sync-scripts: false

Per-Repository Overrides

Like other features in this action, package.json sync supports per-repository configuration:

repos:
  - repo: owner/node-project
    package-json-file: './templates/node-project.json'
    sync-dev-dependencies: true
    sync-scripts: true
  - repo: owner/typescript-project
    package-json-file: './templates/typescript-project.json'
    sync-dev-dependencies: true
    sync-scripts: false

Technical Details

Implementation

• New inputs added to action.yml: package-json-file, sync-dev-dependencies, sync-scripts, package-json-pr-title
• New function: syncPackageJson() (~330 lines) handles the entire sync workflow
• Smart change detection: Deep object comparison to detect actual changes before creating PRs
• PR management: Detects and reports existing open PRs instead of creating duplicates
• Error handling: Comprehensive error messages including npm stderr output
• Cross-platform: Works on Windows, Linux, and macOS

Behavior

• ✅ Only updates existing package.json files (does not create new ones)
• ✅ Replaces entire devDependencies and/or scripts sections from template
• ✅ Automatically updates package-lock.json when syncing devDependencies
• ✅ Creates PRs for review before merging (never auto-merges)
• ✅ Skips creating PR if content is already up to date
• ✅ Supports dry-run mode for preview
• ✅ All commits are verified via GitHub API

Testing

• Added 9 new test cases covering all scenarios
• All 51 tests passing (42 original + 9 new)
• Test coverage maintained at ~79%
• CodeQL security scan: 0 vulnerabilities

Documentation

• Updated README with comprehensive usage examples
• Added new inputs to action inputs table
• Added behavior notes in Important Notes section
• Created example-package.json template file for users

Version

Bumped version from 1.1.1 to 1.2.0 (minor version for new feature)

Related

Closes #[issue-number]

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• img.shields.io
  • Triggering command: node /home/REDACTED/work/bulk-github-repo-settings-sync-action/bulk-github-repo-settings-sync-action/node_modules/.bin/make-coverage-badge-better --label-color #333 --output-path ./badges/coverage.svg (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Sync devDependencies and npm scripts</issue_title>
<issue_description>Probably 2 separate options. But want to sync devDependencies from a sample package.json file as well as a separate option for syncing npm run commands from a package.json.

The devDependencies are tricky bc after updating package.json you need to run npm install to update the package-lock.json too and commit that file also. In the same commit in the API would be nice!</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #16

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