nest-inngest

An unofficial strongly typed Inngest module for Nest.js projects.

Overview

nest-inngest is a library designed for the Nest.js framework, allowing you to leverage all the benefits of the framework, such as Dependency Injection (DI).

Getting Started

Disclaimer: This guide serves as an example of how to use the nest-inngest library. The structure used in the examples is purely illustrative, and you are free to adapt it to your project's current structure.

1. Install the library using your preferred package manager.

    pnpm add nest-inngest

2. In your app.module.ts or a similar file, add a new item to the imports array.

   // app.module.ts
   import { Module } from "@nestjs/core";
   
   import { InngestModule } from "nest-inngest";
   
   import { inngest } from "../lib/inngest";
   
   @Module({
     imports: [
       InngestModule.forRoot({
         inngest,
         path: "/api/inngest",
       }),
     ],
     controllers: [],
     providers: [],
   })
   export class AppModule {}

3. (Optional) In your inngest.ts file, include the schemas using your preferred method.

   // src/lib/inngest.ts
   import { Inngest, EventSchemas } from "inngest";
   import { NestInngest } from "nest-inngest";
   import { z } from "zod";
   
   export const inngest = new Inngest({
     id: "orders",
     // https://www.inngest.com/docs/reference/client/create#defining-event-payload-types
     schemas: new EventSchemas().fromZod({
       "orders/order.created": {
         data: z.object({
           id: z.string().uuid(),
           product: z.string(),
           quantity: z.number(),
         }),
       },
     }),
   });
   
   // instantiate and export Inngest helper decorator
   export const OrdersInngest = NestInngest.from(inngest);

4. Assign a new Inngest function to your controller

   import { Controller } "@nestjs/common";
   import { NestInngest } from "nest-inngest";
   
   import { OrdersInngest } from "../lib/inngest"
   
   @Controller("orders")
   export class OrdersController {
      constructor(private readonly ordersService: OrdersService) {}
   
      @OrdersInngest.Function({
        id: "orders-handler"
      })
      @OrdersInngest.Trigger({
        event: "orders/order.created" // 👈 Type-safety
      })
      public async handleOrderCreated(
        { event, step }: NestInngest.context<typeof OrdersInngest, "orders/order.created"> // 👈 Type helper to function context
      ) {
        // process recently created order
   
        console.log(event.data);
   
        await this.ordersService.sendOrderNotification(event.data.id);
   
        return { success: true }
      }
   }

Roadmap

• Add a global Nest module using the .forRoot pattern.
• Export a class that accepts an instance of Inngest in the constructor and exposes typed decorators.
  • Function decorator
  • Trigger decorator
• Add typing helpers.
  • Helper for typing the Context
• Add automated tests.
• Add automatic documentation in the AsyncAPI spec. (TBD)
• Add Github actions with changelogs and auto releases