Package Manager Detector

Build a utility module that detects which package manager is being used in a project and generates appropriate installation commands.

Requirements

Your module should provide functions to:

1. Detect the package manager being used in a project by checking for lockfiles in the current directory or any parent directories up to the filesystem root. Check in this priority order:

   • pnpm-lock.yaml indicates pnpm
   • yarn.lock indicates yarn
   • package-lock.json indicates npm
   • bun.lockb or bun.lock indicates bun
   • deno.lock indicates deno
   • If no lockfile is found, default to npm

2. Generate appropriate install commands for different package managers. Given a package manager name, package name, and version, construct the correct command to install it as a development dependency.

The install command formats are:

• npm: npm install -D <package>@<version>
• pnpm: pnpm add -D <package>@<version>
• yarn: yarn add -D <package>@<version>
• bun: bun add -D <package>@<version>
• deno: deno install -D npm:<package>@<version>

Test Cases

• When a pnpm-lock.yaml file exists in the current directory, detectLockfile() returns 'pnpm' @test

• When a yarn.lock file exists in the current directory, detectLockfile() returns 'yarn' @test

• When a package-lock.json file exists in the current directory, detectLockfile() returns 'npm' @test

• When no lockfile exists in any directory up to root, detectLockfile() returns 'npm' as the default @test

• generateInstallCommand('pnpm', 'lodash', '4.17.21') returns 'pnpm add -D lodash@4.17.21' @test

• generateInstallCommand('deno', 'lodash', '4.17.21') returns 'deno install -D npm:lodash@4.17.21' @test

Implementation

@generates

API

/**
 * Detects which package manager is being used by searching for lockfiles
 * in the current directory and parent directories.
 * @returns {string} The detected package manager name ('npm', 'pnpm', 'yarn', 'bun', or 'deno')
 */
export function detectLockfile() {
  // implementation
}

/**
 * Generates the install command for a given package manager
 * @param {string} manager - The package manager ('npm', 'pnpm', 'yarn', 'bun', or 'deno')
 * @param {string} packageName - The name of the package to install
 * @param {string} version - The version to install
 * @returns {string} The install command string
 */
export function generateInstallCommand(manager, packageName, version) {
  // implementation
}

Dependencies { .dependencies }

@sveltejs/adapter-auto { .dependency }

Provides multi-package manager detection and command generation functionality.

@satisfied-by