@mbc-cqrs-serverless/cli/templates/infra-local/appsync-simulator/src/main.ts

a CLI to get started with MBC CQRS serverless framework

import {
  AmplifyAppSyncSimulator,
  AmplifyAppSyncSimulatorAuthenticationType,
  AmplifyAppSyncSimulatorConfig,
} from '@aws-amplify/amplify-appsync-simulator'

import { schema } from './schema'
import { readVTL } from './vtl/readVTL'
import { resolversConfig } from './resolversConfig'

class AppSyncSimulator {
  httpPort: number

  constructor(httpPort: number) {
    this.httpPort = httpPort
  }

  async start() {
    const simulatorConfig: AmplifyAppSyncSimulatorConfig = {
      appSync: {
        defaultAuthenticationType: {
          authenticationType: AmplifyAppSyncSimulatorAuthenticationType.API_KEY,
        },
        name: 'api-local',
        additionalAuthenticationProviders: [],
        apiKey: process.env.API_KEY || 'api_key',
      },
      schema: { content: schema },
      mappingTemplates: [
        {
          path: 'sendMessage.req.vtl',
          content: readVTL('sendMessage.req.vtl'),
        },
        {
          path: 'sendMessage.res.vtl',
          content: readVTL('sendMessage.res.vtl'),
        },
      ],
      dataSources: [
        {
          type: 'NONE',
          name: 'NoneDS',
        },
      ],
      resolvers: resolversConfig,
    }
    const amplifySimulator = new AmplifyAppSyncSimulator({
      port: this.httpPort,
    })
    console.log('simulatorConfig', simulatorConfig)
    await amplifySimulator.start()
    await amplifySimulator.init(simulatorConfig)
  }
}

const httpPort = Number(process.env.PORT) || 4000
const simulator = new AppSyncSimulator(httpPort)
simulator.start().then(() => {
  console.log(
    `🚀 App Sync Simulator started at http://localhost:${httpPort}/graphql`,
  )
})