FunctionConfiguration 
    A function is a reusable entity. You can use multiple functions to compose the resolver logic.
Types
Properties
The name of the DataSource.
The Function description.
The Amazon Resource Name (ARN) of the Function object.
A unique ID representing the Function object.
The version of the request mapping template. Currently, only the 2018-05-29 version of the template is supported.
The maximum batching size for a resolver.
The Function request mapping template. Functions support only the 2018-05-29 version of the request mapping template.
The Function response mapping template.
Describes a runtime used by an Amazon Web Services AppSync pipeline resolver or Amazon Web Services AppSync function. Specifies the name and version of the runtime to use. Note that if a runtime is specified, code must also be specified.
Describes a Sync configuration for a resolver.