bad.handlebars

{{#boom}}
{{/boom}}

main.ts

import { Get, Controller, Render } from '@nestjs/common'
import { Module } from '@nestjs/common'
import { FastifyAdapter, NestFactory } from '@nestjs/core'
import * as hbs from 'handlebars'

@Controller()
class AppController {
  @Get()
  @Render('bad.handlebars')
  root() {
    return {}
  }
}

@Module({
  imports: [],
  controllers: [AppController],
  providers: [],
})
class AppModule {}

async function bootstrap() {
  const app = await NestFactory.create(AppModule, new FastifyAdapter())
  hbs.registerHelper({
    boom: () => {
      console.log('Running bad helper');
      // something went wrong
      throw new Error('boom')
    }
  })
  app.setViewEngine({
    engine: {
      handlebars: hbs,
    },
    templates: __dirname,
  })
  await app.listen(3000)
}
bootstrap()

package.json

{
  "name": "repli-nest-fastify",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "ts-node -r tsconfig-paths/register main.ts"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@nestjs/common": "^5.0.0",
    "@nestjs/core": "^5.0.0",
    "fastify": "^1.9.0",
    "fastify-formbody": "^2.0.0",
    "point-of-view": "^1.1.0",
    "reflect-metadata": "^0.1.12",
    "rxjs": "^6.0.0",
    "typescript": "^2.6.2"
  },
  "devDependencies": {
    "@types/handlebars": "^4.0.39",
    "handlebars": "^4.0.11",
    "ts-node": "^7.0.1",
    "tsconfig-paths": "^3.5.0"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": false,
    "noImplicitAny": false,
    "removeComments": true,
    "noLib": false,
    "allowSyntheticDefaultImports": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es6",
    "sourceMap": true,
    "allowJs": true,
    "outDir": "./dist",
    "baseUrl": "./src"
  },
  "include": [
    "src/**/*"
  ],
  "exclude": [
    "node_modules",
    "**/*.spec.ts"
  ]
}