Setup

{
  "dependencies": {
    "inngest": "^3.x.x"
  }
}

import {Inngest} from 'inngest'
import {APP_NAME} from '../constants'

export const inngest = new Inngest({id: APP_NAME})

import {serve} from 'inngest/next'
import {helloWorld, sendWelcomeFollowUpEmail} from '@/lib/inngest/functions'
import {inngest} from '@/lib/inngest/inngest'

export const {GET, POST, PUT} = serve({
  client: inngest,
  functions: [
    helloWorld,
    sendWelcomeFollowUpEmail,
    // Add your functions here
  ],
})

src/
├── lib/inngest/
│   ├── inngest.ts        # Inngest client configuration
│   ├── events.ts         # Event constants and helpers
│   └── functions.ts      # Function definitions
└── app/api/inngest/
    └── route.ts          # API endpoint for Inngest

export const INNGEST_EVENTS = {
  USER_REGISTERED: 'user/registered',
  TEST_HELLO_WORLD: 'test/hello.world',
} as const

export type InngestEventName =
  (typeof INNGEST_EVENTS)[keyof typeof INNGEST_EVENTS]

export const triggerInngestWelcomeFollowUpEmail = async ({
  userId,
  userName,
  userEmail,
  language = 'fr',
}: {
  userId: string
  userName: string
  userEmail: string
  language?: 'fr' | 'en' | 'es'
}) => {
  return await inngest.send({
    name: INNGEST_EVENTS.USER_REGISTERED,
    data: {
      userId,
      userName,
      userEmail,
      language,
    },
  })
}