Is the latest version not compatible with previous configuration?

[zhaoyi0113]

After upgrade to 2.3.1, there are a few configuration not read correctly. After reading the source code, I found previously we need to define appSync under custom, but not it is required to be under root level of the yaml file.
Also the authenticationType is changed to authentication: { type: ...}.

Based on the doc https://www.serverless.com/plugins/serverless-appsync-plugin, the appSync can be an array but the latest code treats it as an object. How can I deploy multiple appsync API via one yaml file?

[SethO]

There are many breaking changes between v1 & v2. This upgrade guide lists all the steps required.