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Upgrading a Theme

Themes developed for previous versions of Liferay DXP must be upgraded in order to be deployed to a new version. The gulp upgrade task updates Liferay version references and theme dependencies. This allows you to deploy your theme to newer versions of Liferay.

Prerequisites

The Liferay Theme Generator is used to run the upgrade task. If you have not done so, then install it with this command:

npm install -g generator-liferay-theme@10.x.x

Install the Yeoman and Gulp dependencies with this command:

npm install -g yo gulp

Running the Upgrade Task

Use the upgrade task to update the theme’s version dependencies.

important

The upgrade task may change or overwrite files in your theme. Back up your theme’s files before running it.

Run this command from inside your theme’s folder:

gulp upgrade

A warning appears reminding you to back up your files if you have not yet done so. When ready, type “y” (or “yes”) to continue at the prompt.

? We recommend creating a backup of your theme files before proceeding. Are you
sure you wish to start the upgrade process?

If you are upgrading to Liferay 7.4, another prompt appears asking if you want to add the Bootstrap 3 to 4 compatibility layer. If your theme requires compatibility with Bootstrap 3, enter “y” (or “yes”), and then enter it again when a warning appears to confirm. If you do not need compatibility with Bootstrap 3, then type “n” (or “no”).

? Would you like to add the Bootstrap 3 to 4 compatibility layer? Yes
? Bootstrap 3 to 4 compatibility layer is for DXP 7.4 GA1 and we cannot garauntee it working with future releases of Liferay DXP. Confirm?

Confirm that the upgrade task has completed with the messages in the console: