Package Management

def install_npm(env_dir, _src_dir, args):
    """
    Install npm package manager in Node.js environment.
    
    Parameters:
    env_dir (str): Environment directory path
    _src_dir (str): Source directory (unused in current implementation)
    args (argparse.Namespace): Configuration arguments
    
    Installs npm using the version specified in args.npm:
    - 'latest' for most recent npm version
    - Specific version number (e.g., '8.19.0')
    - Downloads and configures npm for the environment
    - Sets up proper npm configuration and cache directories
    """

def install_npm_win(env_dir, src_dir, args):
    """
    Install npm on Windows platforms with Windows-specific handling.
    
    Parameters:
    env_dir (str): Environment directory path
    src_dir (str): Source/download directory
    args (argparse.Namespace): Configuration arguments
    
    Handles Windows-specific npm installation requirements:
    - Windows path separators and executable extensions
    - npm.cmd and npm batch file setup
    - Windows registry and environment variable configuration
    - PowerShell execution policy considerations
    """

def install_packages(env_dir, args):
    """
    Install npm packages from requirements file.
    
    Parameters:
    env_dir (str): Environment directory path
    args (argparse.Namespace): Configuration arguments containing requirements file path
    
    Processes requirements file containing package specifications:
    - Package names with specific versions (e.g., 'express@4.18.0')
    - Package names with version ranges
    - Git repository URLs
    - Local file paths
    
    Requirements file format example:
    express@4.18.0
    lodash@^4.17.21
    moment@>=2.29.0
    
    Installs packages globally within the Node.js environment
    and handles dependency resolution and version conflicts.
    """

# In bash/zsh environments
freeze [output_file]

# List installed packages
freeze

# Save to requirements file  
freeze requirements.txt

# List local packages only
freeze -l requirements.txt

# In fish shell environments
freeze [output_file]

# List installed packages
freeze

# Save to requirements file
freeze requirements.txt

# List local packages only  
freeze -l requirements.txt

import nodeenv
from argparse import Namespace

args = Namespace(
    npm='8.19.0',  # Specific npm version
    with_npm=True
)

nodeenv.install_npm('/path/to/env', '/tmp/src', args)

import nodeenv
from argparse import Namespace

# Create requirements.txt with content:
# express@4.18.0
# lodash@4.17.21
# moment@2.29.4

args = Namespace(
    requirements='/path/to/requirements.txt',
    jobs='2'
)

nodeenv.install_packages('/path/to/env', args)

import nodeenv
from argparse import Namespace

# Create environment and install packages
args = Namespace(
    node='18.17.0',
    npm='9.8.0', 
    with_npm=True,
    requirements='/path/to/requirements.txt',
    jobs='4'
)

env_dir = '/path/to/myenv'
src_dir = '/tmp/nodeenv-src'

# Create environment
nodeenv.create_environment(env_dir, args)

# Packages are automatically installed if requirements file specified

# Activate environment
source myenv/bin/activate

# Install some packages
npm install -g express lodash moment

# List installed packages
freeze

# Output:
# express@4.18.2
# lodash@4.17.21  
# moment@2.29.4

# Save to requirements file
freeze requirements.txt

# Deactivate environment
deactivate_node