How to access constants from extension?

How can I access the constants (options) of an extension in my Site sets settings? For example: I´ve news running and want to configure it via my Site sets settings.

Thanks!

Solution

You have to use the other way round: use values of your SiteSet as constants.

Have a look for details in Feature: #91080 - Site settings as TypoScript constants and in TSconfig

Example

We'll set the CSS file of EXT:news.

The TypoScript looks lieke this:

plugin.tx_news {
    settings {
        cssFile = {$plugin.tx_news.settings.cssFile}
    }
}

For setting this constant via SiteSettings, your Site settings definition (settings.definitions.yaml) should look like:

settings:
  plugin.tx_news.settings.cssFile:
    label: 'Path to CSS file'
    type: string
    default: 'EXT:news/Resources/Public/Css/news-basic.css'