@modulify/pkg

@modulify/pkg is a utility library for working with Node.js package worktrees. It provides functions to read, update, and traverse multiple package manifests, making it easier to interact with monorepos and workspace-like structures.

Features

• Read and parse worktrees:

  • Load package.json files across a workspace hierarchy.
  • Automatically detect nested workspaces.

• Update manifests:

  • Modify and rewrite parts of package.json.
  • Automatically detects indentation and newline styles for consistent formatting.

• Traverse worktrees:

  • Walk through nested workspaces and perform asynchronous operations on each node.

Install

# Using yarn
yarn add @modulify/pkg

# Using npm
npm install @modulify/pkg

Requirements

• Node.js: >=20.0.0

Usage

1. Reading a Worktree

To read the workspace tree starting from a given directory:

import { read } from '@modulify/pkg';

const worktree = read('/path/to/root'); // Loads the root and all nested workspaces
console.log(worktree);

2. Updating a Manifest

Update specific fields of a package.json file:

import { update } from '@modulify/pkg';

update('/path/to/workspace', { version: '1.0.1' }); // Updates "version" field in package.json

Use the dry flag to test without making actual changes:

update('/path/to/workspace', { scripts: { test: 'vitest' } }, true);

3. Traversing a Worktree

Perform operations on each workspace in the tree:

import { walk } from '@modulify/pkg';

const worktree = read('/path/to/root');

await walk([worktree], async (workspace) => {
  console.log(`Workspace: ${workspace.name}`);
});

API

read

Reads the worktree starting from a given directory.

• Parameters:
  • path: string - Root path of the workspace.
• Returns:
  • A Workspace object containing name, path, manifest, children, and other metadata.

update

Updates fields in a package.json file.

• Parameters:
  • path: string - Path to the workspace.
  • diff: Partial<Manifest> - Changes to apply.
  • dry: boolean (optional) - If true, does not modify the file.
• Returns:
  • The path to the updated file.

walk

Visits each node in a worktree and performs the provided asynchronous operation.

• Parameters:
  • worktree: Workspace[] - Array of workspaces to traverse.
  • visit: (node: Workspace) => Promise<void> - Async operation to perform on each node.