How upgrade to primeng 18 from previous version

[balagex]

Hi,

As I see in the new primeng 18 documentation, there eill be a new configuration for the 18 version. Is there any upgrade guide, which will tell the way, how we should to set this configuration based on the existing project which using older primeng version. Which old configuration should keep, like styles in angular.json, and which should replace with new config, and how?

[djad442]

my suggestion would be to create a new project in a separate folder with ng new (version ng 18). then include the PrimeNG 18 libraries as per their start-up guide. Copy the src folder from your project to the new project and try.

[balagex]

Thanks for the suggestion, but I prefer to see an official step-by-step guide from the primeng developer side, because they exactly knows what and how had been changed behind the scenes.

[htdong]

I had been implementing v18 since it was first created till yesterday but still struggle with new theming approach. What I could share my experience is to recreate the entire new app as there are many breaking changes, especially if you use PrimeFlex or have many controls using templates.

[tkoseoglu]

I am in the same boat. The component and module changes are no issue. The new theming config, however, is. I had to abandon my upgrade to v18, unfortunately.

[NateRadebaugh]

@cagataycivici is there an official migration guide for how to migrate from a prime@17 to prime@18 theming engine? I have a large project with many components and theme customizations and am also trying to understand the recommended approach.

[NateRadebaugh]

Found the migration guide here that basically says the only way is to start from scratch for the new theming system:
https://primeng.org/guides/migration