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AWS Amplify inspired CDK construct for creating @directive based AppSync APIs

Project description

AppSync Transformer Construct for AWS CDK

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npm version PyPI version

Why This Package

In April 2020 I wrote a blog post on using the AWS Cloud Development Kit with AppSync. I wrote my own transformer in order to emulate AWS Amplify's method of using GraphQL directives in order to template a lot of the Schema Definition Language.

This package is my attempt to convert all of that effort into a separate construct in order to clean up the process.

How Do I Use It

Example Usage

API With Default Values

# Example automatically generated without compilation. See
from aws_cdk_appsync_transformer import AppSyncTransformer
AppSyncTransformer(self, "my-cool-api",


type Customer @model
    @auth(rules: [
        { allow: groups, groups: ["Admins"] },
        { allow: private, provider: iam, operations: [read, update] }
    ]) {
        id: ID!
        firstName: String!
        lastName: String!
        active: Boolean!
        address: String!

type Product @model
    @auth(rules: [
        { allow: groups, groups: ["Admins"] },
        { allow: public, provider: iam, operations: [read] }
    ]) {
        id: ID!
        name: String!
        description: String!
        price: String!
        active: Boolean!
        added: AWSDateTime!
        orders: [Order] @connection

type Order @model
    @key(fields: ["id", "productID"]) {
        id: ID!
        productID: ID!
        total: String!
        ordered: AWSDateTime!

Supported Amplify Directives



Not Yet Supported:


User Pool Authentication

# Example automatically generated without compilation. See
user_pool = UserPool(self, "my-cool-user-pool", ...
user_pool_client = UserPoolClient(self, f"{id}-client",
    user_pool=self.user_pool, ...
AppSyncTransformer(self, "my-cool-api",
        "default_authorization": {
            "authorization_type": AuthorizationType.USER_POOL,
            "user_pool_config": {
                "user_pool": user_pool,
                "app_id_client_regex": user_pool_client.user_pool_client_id,
                "default_action": UserPoolDefaultAction.ALLOW


Unauth Role: TODO

Auth Role: Unsupported (for now?). Authorized roles (Lambda Functions, EC2 roles, etc) are required to setup their own role permissions.


Fields with the @function directive will be accessible via api.outputs.FUNCTION_RESOLVERS. It will return an array like below.Currently these are not named and do not specify a region. There are improvements that can be made here but this simple way has worked for me so I've implemented it first. Typically I send all @function requests to one Lambda Function and have it route as necessary.

  { typeName: 'Query', fieldName: 'listUsers' },
  { typeName: 'Query', fieldName: 'getUser' },
  { typeName: 'Mutation', fieldName: 'createUser' },
  { typeName: 'Mutation', fieldName: 'updateUser' }

DataStore Support

  1. Pass syncEnabled: true to the AppSyncTransformerProps
  2. Generate necessary exports (see Code Generation below)

Code Generation

I've written some helpers to generate code similarly to how AWS Amplify generates statements and types. You can find the code here.


I will attempt to align the major and minor version of this package with AWS CDK, but always check the release descriptions for compatibility.

I currently support GitHub package.json dependency version (prod)



See CONTRIBUTING for details


Distributed under Apache License, Version 2.0

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