conditionally render siteUrl property in Gatsby-config based on environment

Question

I would like to set up a simple expression in my gatsby-config.js that determines whether I am working locally or in production so that I can set the siteUrl<

Answer 1

Yes you can, by setting up environment variables.

Create some .env.* files in root folder for different environments.

Docs here: https://www.gatsbyjs.org/docs/environment-variables/