Heroku 找不到 ts-node

Question

我在多人游戏中使用Colyseus。该框架生成了一个打字稿服务器，我试图将其部署到 Heroku。我在日志中收到以下错误：

2019-08-18T09:45:55.362304+00:00 app[web.1]: npm ERR! syscall spawn
2019-08-18T09:45:55.363375+00:00 app[web.1]: npm ERR! my-app@1.0.0 start: `ts-node index.ts`
2019-08-18T09:45:55.363477+00:00 app[web.1]: npm ERR! spawn ENOENT
2019-08-18T09:45:55.363677+00:00 app[web.1]: npm ERR! 
2019-08-18T09:45:55.363800+00:00 app[web.1]: npm ERR! Failed at the my-app@1.0.0 start script.
2019-08-18T09:45:55.363912+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2019-08-18T09:45:55.373038+00:00 app[web.1]: 
2019-08-18T09:45:55.373380+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2019-08-18T09:45:55.373520+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2019-08-18T09_45_55_365Z-debug.log

我的package.json：

{
  "name": "my-app",
  "version": "1.0.0",
  "description": "npm init template for bootstraping an empty Colyseus project",
  "main": "lib/index.js",
  "scripts": {
    "start": "ts-node index.ts",
    "loadtest": "colyseus-loadtest loadtest/example.ts --room my_room --numClients 2",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "UNLICENSED",
  "bugs": {
    "url": "https://github.com/colyseus/create-colyseus/issues"
  },
  "homepage": "https://github.com/colyseus/create-colyseus#readme",
  "devDependencies": {
    "@colyseus/loadtest": "^0.10.1",
    "@types/express": "^4.16.1",
    "ts-loader": "^5.3.3",
    "ts-node": "^8.1.0",
    "typescript": "^3.4.5"
  },
  "dependencies": {
    "@colyseus/monitor": "^0.10.0",
    "@colyseus/social": "^0.10.2",
    "colyseus": "^0.10.7",
    "express": "^4.16.4",
    "express-jwt": "^5.3.1"
  }
}

这是tsconfig.json：

{
  "compilerOptions": {
    "outDir": "lib",
    "target": "es6",
    "module": "commonjs",
    "strict": true,
    "esModuleInterop": true,
    "experimentalDecorators": true
  }
}

为什么 Heroku 找不到ts-node？

Answer 1

ts-node列在您的devDependencies但它们在运行时开箱即用：

默认情况下，Heroku 将安装package.json在dependencies和 下列出的所有依赖项devDependencies。

在运行安装和构建步骤之后， Heroku 将devDependencies在部署应用程序之前去掉在下面声明的包。

如果您ts-node在运行时需要，我建议将其移至您的dependencies.

其他解决方案是仅在构建时使用它（我不确定这是否可行，ts-node但它可能涉及将您的 TypeScript 编译为 JavaScript）或配置 Heroku 不剥离您的devDependencies. 我强烈建议不要使用最后一个选项——devDependencies在生产中不应该需要。