Auto-generate Angular Clients from a Nest-Swagger API

package.json

{
  "name": "my-api",
  "version": "0.0.1",
  "description": "",
  "author": "",
  "private": true,
  "license": "UNLICENSED",
  "scripts": {
    "prebuild": "rimraf dist",
    "build": "nest build",
    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
    "start": "nest start",
    "start:dev": "nest start --watch",
    "start:debug": "nest start --debug --watch",
    "start:prod": "node dist/main",
    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
    "test": "jest",
    "test:watch": "jest --watch",
    "test:cov": "jest --coverage",
    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
    "test:e2e": "jest --config ./test/jest-e2e.json",
    "swaggergen": "ts-node ./src/swaggergen.ts --output cfn/symposia-api-swagger.json && ng-openapi-gen --input cfn/symposia-api-swagger.json --output cfn/client"
  },
  "dependencies": {
    "@nestjs/common": "^7.0.0",
    "@nestjs/core": "^7.0.0",
    "@nestjs/platform-express": "^7.0.0",
    "@nestjs/swagger": "^4.5.7",
    "class-transformer": "^0.2.3",
    "class-validator": "^0.12.2",
    "ng-openapi-gen": "^0.11.1",
    "reflect-metadata": "^0.1.13",
    "rimraf": "^3.0.2",
    "rxjs": "^6.5.4",
    "swagger-ui-express": "^4.1.4"
  },
  "devDependencies": {
    "@nestjs/cli": "^7.0.0",
    "@nestjs/schematics": "^7.0.0",
    "@nestjs/testing": "^7.0.0",
    "@types/express": "^4.17.3",
    "@types/jest": "25.1.4",
    "@types/node": "^13.9.1",
    "@types/supertest": "^2.0.8",
    "@typescript-eslint/eslint-plugin": "^2.23.0",
    "@typescript-eslint/parser": "^2.23.0",
    "eslint": "^6.8.0",
    "eslint-config-prettier": "^6.10.0",
    "eslint-plugin-import": "^2.20.1",
    "jest": "^25.1.0",
    "prettier": "^2.0.5",
    "supertest": "^4.0.2",
    "ts-jest": "25.2.1",
    "ts-loader": "^6.2.1",
    "ts-node": "^8.6.2",
    "tsconfig-paths": "^3.9.0",
    "typescript": "^3.9.3"
  },
  "jest": {
    "moduleFileExtensions": [
      "js",
      "json",
      "ts"
    ],
    "rootDir": "src",
    "testRegex": ".spec.ts$",
    "transform": {
      "^.+\\.(t|j)s$": "ts-jest"
    },
    "coverageDirectory": "../coverage",
    "testEnvironment": "node"
  }
}

swaggergen.ts

import { NestFactory } from '@nestjs/core';
import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
import { AppModule } from './app.module';
import { writeFileSync } from 'fs';

async function generateSwaggerFile() {
  const outputFlagIndex = process.argv.findIndex(f => f === 'output');
  const outputFile = process.argv[outputFlagIndex + 1];

  const app = await NestFactory.create(AppModule);

  const options = new DocumentBuilder()
    .setTitle('Symposia API')
    .setDescription('The Symposia API description')
    .setVersion('1.0')
    .build();

  const document = SwaggerModule.createDocument(app, options);

  writeFileSync(outputFile, JSON.stringify(document, null, 2));
}

generateSwaggerFile();