将Nestjs api部署到Heroku

问题描述

当我将Nestjs rest api部署到heroku时，我没有收到任何错误，但是在我手动结束该过程之前，它陷入了一个半小时的循环中

screenshot of the console

它不停地

Procfile

web: npm run start:prod

package.json

{
  "name": "rest-api","version": "0.0.1","description": "","author": "","engines": {
    "node": "12.13.1"
  },"private": true,"license": "UNLICENSED","scripts": {
    "start":"node dist/src/main.js","prestart:prod": "npm install","start:dist": "node dist/main.js","start:prod": "node dist/main.js","postinstall": "npm run prestart:prod","prebuild": "rimraf dist","build": "nest build","format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"","start:dev": "nest start --watch","start:debug": "nest start --debug --watch","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"
  },"dependencies": {
    "@nestjs/common": "^7.0.0","@nestjs/core": "^7.0.0","@nestjs/jwt": "^7.1.0","@nestjs/passport": "^7.1.0","@nestjs/platform-express": "^7.4.2","@nestjs/typeorm": "^7.1.0","@types/bcrypt": "^3.0.0","bcrypt": "^5.0.0","class-transformer": "^0.3.1","class-validator": "^0.12.2","config": "^3.3.1","multer": "^1.4.2","passport": "^0.4.1","passport-jwt": "^4.0.0","pg": "^8.3.0","reflect-metadata": "^0.1.13","rimraf": "^3.0.2","rxjs": "^6.5.4","typeorm": "^0.2.25"
  },"devDependencies": {
    "@nestjs/cli": "^7.0.0","@nestjs/schematics": "^7.0.0","@nestjs/testing": "^7.0.0","@types/express": "^4.17.7","@types/jest": "25.2.3","@types/node": "^13.9.1","@types/supertest": "^2.0.8","@typescript-eslint/eslint-plugin": "3.0.2","@typescript-eslint/parser": "3.0.2","eslint": "7.1.0","eslint-config-prettier": "^6.10.0","eslint-plugin-import": "^2.20.1","jest": "26.0.1","prettier": "^1.19.1","supertest": "^4.0.2","ts-jest": "26.1.0","ts-loader": "^6.2.1","ts-node": "^8.6.2","tsconfig-paths": "^3.9.0","typescript": "^3.7.4"
  },"jest": {
    "moduleFileExtensions": [
      "js","json","ts"
    ],"rootDir": "src","testRegex": ".spec.ts$","transform": {
      "^.+\\.(t|j)s$": "ts-jest"
    },"coverageDirectory": "../coverage","testEnvironment": "node"
  }
}

main.ts

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

async function bootstrap() {
  const serverConfig = config.get('server')
  const app = await NestFactory.create(AppModule);
  app.enableCors();
  const port = process.env.Port|| 3000
  await app.listen(port);
}
bootstrap();

有什么解决办法吗？ 我尝试添加一些脚本，例如 “ heroku-postbuild”：“回显在Heroku上构建” 但也没用！

修改

问题已解决，这是因为我在config.yml文件中使用了一个变量，出于某种原因，heroku一直拒绝使用它！

解决方法

您在package.json

中的后安装脚本配置不正确

"postinstall": "npm run prestart:prod","prestart:prod": "npm install",

它的作用是再次触发npm install。 在heroku上，正在运行的安装会在完成后触发安装后安装，其中包括通过命令手动运行npm install。

因此，您运行安装，这将触发安装后，然后触发另一次安装，依此类推。

我不确定您要使用该脚本完成什么操作，但是由于它实际上并没有执行任何操作，因此我建议您将其从package.json中删除。