Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

JavaScript Resolver function reference for None data source

The Amazon AppSync resolver function request and response with the data source of type None enables you to shape requests for Amazon AppSync local operations.

Request

The request handler can be simple and enables you to pass as much contextual information as possible via the payload field.

type NONERequest = {
  payload: any;
};

Here is an example where the field arguments are passed to the payload:

export function request(ctx) {
  return {
    payload: context.args
  };
}

The value of the payload field will be forwarded to the function response handler and is available in context.result.

Payload

The payload field is a container that can be used to pass any data that is then made available to the function response handler.

The payload field is optional.

Response

Because there is no data source, the value of the payload field will be forwarded to the function response handler and set on the context.result property.

If the shape of the payload field value exactly matches the shape of the GraphQL type, you can forward the response using the following response handler:

export function request(ctx) {
  return ctx.result;
}

There are no required fields or shape restrictions that apply to the return response. However, because GraphQL is strongly typed, the resolved response must match the expected GraphQL type.