Gatsby - GraphQLError: Enum "ImageFormat" cannot represent value: "auto"

根源没有细看，但是表面原因是 gatsby-image 插件已经被废弃。

https://www.gatsbyjs.com/plugins/gatsby-image/

按照官方文档

The gatsby-image package is now deprecated. The new Gatsby image plugin has better performance, cool new features and a simpler API. See the migration guide to learn how to upgrade.

迁移到 gatsby-plugin-image 后，问题解决。