Appsync Repo Access

import * as appsync from 'aws-cdk-lib/aws-appsync'; import * as dynamodb from 'aws-cdk-lib/aws-dynamodb'; const api = new appsync.GraphqlApi(this, 'Api', { name: 'MyAPI', schema: appsync.Schema.fromAsset('backend/schema/schema.graphql'), authorizationConfig: { defaultAuthorization: { authorizationType: appsync.AuthorizationType.API_KEY } }, });

type Mutation { createItem(name: String!): Item } AWS AppSync now supports JavaScript resolvers (runtime APPSYNC_JS ), which are easier to write and debug than VTL. Store each resolver in its own file, named after the field it resolves. 3. Data Sources Definition Define connections to DynamoDB, Lambda, RDS, or HTTP endpoints. This file maps logical names to physical resources. 4. Infrastructure as Code (IaC) This is the most critical part of your AppSync repo . Without IaC, your repo is just documentation. With IaC, your repo becomes executable infrastructure. Choosing Your Infrastructure as Code Tool for AppSync Your AppSync repo must include IaC. Here are the three most popular choices: Option A: AWS CDK (Recommended) The AWS Cloud Development Kit allows you to define your AppSync API using TypeScript, Python, or Java.

my-appsync-repo/ ├── backend/ │ ├── schema/ │ │ └── schema.graphql │ ├── resolvers/ │ │ ├── Query/ │ │ │ ├── getItem.js │ │ │ └── listItems.js │ │ ├── Mutation/ │ │ │ ├── createItem.js │ │ │ └── updateItem.js │ │ └── pipelines/ │ ├── datasources/ │ │ └── datasources.json │ └── functions/ │ └── auth.js ├── infrastructure/ │ ├── appsync-stack.ts (CDK) │ └── config/ ├── tests/ │ ├── unit/ │ └── integration/ ├── scripts/ │ └── deploy.sh └── README.md This is the heart of your API. It defines types, queries, mutations, and subscriptions. Keep it in a single file or split it using #import directives. Example: appsync repo

type Item { id: ID! name: String! createdAt: AWSDateTime! } type Query { getItem(id: ID!): Item }

import { util } from '@aws-appsync/utils'; export function request(ctx) { const userId = ctx.identity.claims.sub; return { operation: 'GetItem', key: { id: ctx.args.id, userId } }; } Store subscription resolvers separately. Use @aws_subscribe directives in your schema to link mutations to subscriptions. Your repo should include directives. Testing Your AppSync Repo An AppSync repo without tests is risky. Implement three layers: Unit Tests (Jest + @aws-appsync/utils ) Test resolver logic without AWS infrastructure. import * as appsync from 'aws-cdk-lib/aws-appsync'; import *

Start today: create a new GitHub repository, initialize a CDK app, add your schema.graphql , write one resolver, and deploy it. Once you have that working, expand with data sources, pipelines, and real-time subscriptions. Your future self — and your team — will thank you.

In the modern cloud development landscape, building real-time applications requires a robust backend that can handle GraphQL queries, mutations, and subscriptions without forcing developers to manage servers. AWS AppSync has emerged as a leading managed GraphQL service. However, as projects scale, developers often search for the term "AppSync repo" — a concept that goes beyond a simple code repository. It represents the structured management of an AppSync project: the schema, resolvers, data sources, pipelines, and CI/CD integration. Infrastructure as Code (IaC) This is the most

const table = new dynamodb.Table(this, 'ItemsTable', { ... }); const dataSource = api.addDynamoDbDataSource('ItemsDS', table);