How can a themelet be installed globally in Liferay?

To install a themelet globally in Liferay, using the npm install -g command is the correct approach. This command installs the specified package globally on your system, making the themelet available to any instance of Liferay without needing to navigate to a particular project directory every time you want to use it. This global installation is particularly useful for developers who may want to work with themelets across multiple Liferay projects without redundancy.

This method also leverages npm's capabilities for managing JavaScript packages effectively, ensuring that the themelet can be easily updated or removed as needed, and it is accessible system-wide, allowing for easier management of dependencies within a development environment.

The other methods mentioned are not correct for installing themelets globally. For example, modifying the configuration file directly does not facilitate the installation of themelets, as it typically involves changing settings or parameters rather than managing packages. Deploying through Liferay Marketplace pertains to the distribution and installation of applications or themes that are published for use in Liferay environments but does not relate to the npm installation process.