Incremental builds and custom source

[vladimir-stornest]

Hello,

I have an application that sources data from custom GraphQL CMS written in node.js. I want to start using Incremental Builds.

I'm trying to find official documentation on implementing my sourcing to support Incremental builds for my custom API. I checked this article, but it references these links which don't include the needed implementation for Incremental Builds either:
https://www.gatsbyjs.com/docs/how-to/plugins-and-themes/creating-a-source-plugin/#create-foreign-key-relationships-between-data
https://www.gatsbyjs.com/docs/creating-a-source-plugin/

[KyleAMathews]

Incremental builds work automatically.

The main thing you should do to speed up builds is to support delta fetched. So on subsequent runs, only fetch updated data https://www.gatsbyjs.com/docs/creating-a-source-plugin/#improve-plugin-developer-experience-by-enabling-faster-sync