npm:tldr:84f19

This command is meant to be executed in the terminal using the Node Package Manager (npm). It installs a particular module or package into your Node.js project and saves it as a development dependency.

Here is a breakdown of the command:

• npm install: This is the command to install packages in your Node.js project using npm.
• ${module_name}: This is a placeholder for the name of the module or package that you want to install. Replace it with the actual name of the module you want to install.
• --save-dev: This is an option that tells npm to save the installed module as a development dependency. Development dependencies are not required for running the project in a production environment, but they are necessary for development purposes such as running tests, compiling code, or automated tasks. The --save-dev flag updates the package.json file with the installed module as a devDependency.

So when you execute npm install ${module_name} --save-dev, npm will download and install the specified module as a development dependency in your project, and it will also update your package.json file to include the dependency under the devDependencies key.