GraphQL by PoP relies on Symfony's Dotenv component to define the configuration through environment variables.
DEV environment, you can set-up environment variables in the project's
config/.env file, like this:
You can also create additional localized
.env files (such as
.env.local) in folder
config/, as detailed in the component's documentation.
Throughout this documentation, whenever a component is configurable, there will be a Configuration section listing down its environment variables.