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@ttoss/appsync-api

v0.18.35

Published

A library for building GraphQL APIs for AWS AppSync.

Downloads

136

Readme

@ttoss/appsync-api

This package provides a opinionated way to create an AppSync API using @ttoss/graphql-api API.

Installation

pnpm add @ttoss/appsync-api @ttoss/graphql-api graphql

Getting Started

You can create and deploy an AppSync API in four steps:

  1. Create a schemaComposer object using graphql-compose, that the next steps will use to create the API.

  2. Create a cloudformation.ts file that exports a CloudFormation template using createApiTemplate:

import { createApiTemplate } from '@ttoss/appsync-api';
import { schemaComposer } from './schemaComposer';

const template = createApiTemplate({
  schemaComposer,
  dataSource: {
    roleArn: {
      'Fn::ImportValue': 'AppSyncLambdaDataSourceIAMRoleArn',
    },
  },
  lambdaFunction: {
    roleArn: {
      'Fn::ImportValue': 'AppSyncLambdaFunctionIAMRoleArn',
    },
  },
});

export default template;
  1. Create a lambda.ts file that exports a Lambda handler function using createAppSyncResolverHandler:
import { createAppSyncResolverHandler } from '@ttoss/appsync-api';
import { schemaComposer } from './schemaComposer';

export const handler = createAppSyncResolverHandler({ schemaComposer });
  1. Add graphql to the lambdaExternals array on carlin.yml:
lambdaExternals:
  - graphql

Now you can deploy your API using carlin deploy:

carlin deploy

API

Resolvers Context

The createAppSyncResolverHandler function adds the context object to the resolvers. This object contains the following properties:

Custom domain name

You can add a custom domain name to your API using the customDomain option.

import { createApiTemplate } from '@ttoss/appsync-api';

export const handler = createApiTemplate({
  schemaComposer,
  customDomain: {
    domainName: 'api.example.com', // required
    certificateArn: {
      'Fn::ImportValue': 'AppSyncDomainCertificateArn',
    }, // required
  },
});

If your domain is on Route53, you can use the option customDomain.hostedZoneName to create the required DNS records.

import { createApiTemplate } from '@ttoss/appsync-api';

export const template = createApiTemplate({
  schemaComposer,
  customDomain: {
    domainName: 'api.example.com', // required
    certificateArn: {
      'Fn::ImportValue': 'AppSyncDomainCertificateArn',
    }, // required
    hostedZoneName: 'example.com.', // optional
  },
});