Nestjs REPL

console.ts

import 'dotenv/config';
import { NestFactory } from '@nestjs/core';
import * as repl from 'repl';
import * as Logger from 'purdy';

const LOGGER_OPTIONS = {
  indent: 2,
  depth: 1,
};

class InteractiveNestJS {
  async run() {
    // create the application context
    const targetModule = require(`${__dirname}/app.module`);
    const applicationContext = await NestFactory.createApplicationContext(
      // tslint:disable-next-line: no-string-literal
      targetModule['AppModule'],
    );
    const awaitOutside = require('await-outside');
    // start node repl
    const server = repl.start({
      useColors: true,
      prompt: '> ',
      writer: replWriter,
      ignoreUndefined: true,
    });
    server.context.app = applicationContext;
    awaitOutside.addAwaitOutsideToReplServer(server);
  }
}

function replWriter(value: object): string {
  return Logger.stringify(value, LOGGER_OPTIONS);
}

const session = new InteractiveNestJS();
session.run();

In package.json add "console": "ts-node -r tsconfig-paths/register src/console.ts",

Start the repl using npm run console . Then you could do something like

> app.get('MyService')

Thank you so much, with your instructions I could debug my application.

Thanks!

Thanks for sharing, here the one liner dependencies install:

npm install purdy repl await-outside --save-dev

Awesome, this is something I've really missed from other frameworks.

Awesome, thanks

Hey, I tried to use this in NestJS 8, but I'm getting an error Nest could not find AppService element (this provider does not exist in the current context) when i do let a = await app.get("AppService");.

I have the same error as ashug0001 :(