在Heroku上没有安装babel-node

Question

我在Heroku上使用babel-node for ES6语法，但是在部署时遇到了构建错误。它说“babel-node：not found”。我已经尝试在我的本地计算机上进行全新安装，它运行良好。的package.json：

{
  "name": "secret",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "start": "./node_modules/.bin/babel-node ./bin/www"
  },
  "engines": {
    "node": "7.5.0",
    "npm": "5.0.3"
  },
  "dependencies": {
    "babel-cli": "^6.24.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-stage-0": "^6.24.1",
    ...
  }
}

我感谢您的帮助！ :)

2017-07-17T11:02:26.997876+00:00 heroku[web.1]: State changed from crashed to starting
2017-07-17T11:02:31.839278+00:00 heroku[web.1]: Starting process with command `npm start`
2017-07-17T11:02:38.074157+00:00 heroku[web.1]: State changed from starting to crashed
2017-07-17T11:02:38.062607+00:00 heroku[web.1]: Process exited with status 1
2017-07-17T11:02:37.865774+00:00 app[web.1]:
2017-07-17T11:02:37.865786+00:00 app[web.1]: > [email protected] start /app
2017-07-17T11:02:37.865787+00:00 app[web.1]: > babel-node ./bin/www
2017-07-17T11:02:37.865787+00:00 app[web.1]:
2017-07-17T11:02:37.936361+00:00 app[web.1]: sh: 1: babel-node: not found
2017-07-17T11:02:37.966452+00:00 app[web.1]: npm ERR! file sh
2017-07-17T11:02:37.966683+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2017-07-17T11:02:37.966931+00:00 app[web.1]: npm ERR! errno ENOENT
2017-07-17T11:02:37.967106+00:00 app[web.1]: npm ERR! syscall spawn
2017-07-17T11:02:37.967287+00:00 app[web.1]: npm ERR! [email protected] start: `babel-node ./bin/www`
2017-07-17T11:02:37.967430+00:00 app[web.1]: npm ERR! spawn ENOENT
2017-07-17T11:02:37.967588+00:00 app[web.1]: npm ERR!
2017-07-17T11:02:37.967733+00:00 app[web.1]: npm ERR! Failed at the [email protected] start script.
2017-07-17T11:02:37.967873+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2017-07-17T11:02:37.969151+00:00 app[web.1]:
2017-07-17T11:02:37.969374+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2017-07-17T11:02:37.969484+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2017-07-17T11_02_37_957Z-debug.log
2017-07-17T11:25:52.044791+00:00 heroku[web.1]: State changed from crashed to starting
2017-07-17T11:25:54.841341+00:00 heroku[web.1]: Starting process with command `npm start`
2017-07-17T11:25:57.407691+00:00 heroku[web.1]: Process exited with status 1
2017-07-17T11:25:57.413873+00:00 heroku[web.1]: State changed from starting to crashed
2017-07-17T11:25:57.310176+00:00 app[web.1]:
2017-07-17T11:25:57.310190+00:00 app[web.1]: > [email protected] start /app
2017-07-17T11:25:57.310191+00:00 app[web.1]: > babel-node ./bin/www
2017-07-17T11:25:57.310192+00:00 app[web.1]:
2017-07-17T11:25:57.316940+00:00 app[web.1]: sh: 1: babel-node: not found
2017-07-17T11:25:57.335019+00:00 app[web.1]: npm ERR! file sh
2017-07-17T11:25:57.335287+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2017-07-17T11:25:57.335517+00:00 app[web.1]: npm ERR! errno ENOENT
2017-07-17T11:25:57.335735+00:00 app[web.1]: npm ERR! syscall spawn
2017-07-17T11:25:57.335933+00:00 app[web.1]: npm ERR! [email protected] start: `babel-node ./bin/www`
2017-07-17T11:25:57.336095+00:00 app[web.1]: npm ERR! spawn ENOENT
2017-07-17T11:25:57.336280+00:00 app[web.1]: npm ERR!
2017-07-17T11:25:57.336449+00:00 app[web.1]: npm ERR! Failed at the [email protected] start script.
2017-07-17T11:25:57.336614+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2017-07-17T11:25:57.337985+00:00 app[web.1]:
2017-07-17T11:25:57.338232+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2017-07-17T11:25:57.338379+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2017-07-17T11_25_57_323Z-debug.log

Answer 1

有点晚了，但这是我认为你错过的：

步骤（1）：终端中的npm install --save babel-cli babel-preset-env

关于步骤1的注意事项：不要保存到dev，因为这将要求您设置NPM_CONFIG_PRODUCTION = false

步骤（2）：如果没有添加babel样板文件或使用babelrc文件，您不会编译任何东西。最简单的方法是在主app文件夹中创建.babelrc文件，即。你的package.json在同一个并输入以下内容：

 {
  "presets": ["env"]
}

关于步骤2的注意事项：使用env预设时，您不需要babel-preset-es2015等

步骤（3）：您现在可以使用babel-node运行代码，因此在您的情况下执行您的启动脚本，即。 ./node_modules/.bin/babel-node ./bin/www

如果您需要进一步了解预设逻辑，我建议您阅读NPM模块：https://www.npmjs.com/package/babel-preset-env

此外，我建议使用像pm2这样的流程管理器。这允许您的节点实例在崩溃时保持活动状态。永远模块曾经这样做但pm2更好。以下是package.json中的启动脚本示例：

“scripts”：{“start”：“node ./node_modules/.bin/pm2 start main.json --attach --env production”}

Procfile（注意，我使用的是nginx，但只是npm start才能正常工作）：

web: bin/start-nginx npm start 
worker: node ./node_modules/.bin/pm2 start worker.json --attach

这将是你的main.json与args使用babel-node（注意，将实例保持为1并且不要在Heroku中的web dyno上分叉）：

main.json：

{
  "name": "the_awesome",
  "script": "app.js",
  "instances": 1,
  "exec_mode": "cluster"
}

worker.json：

{
  "name": "worker",
  "script": "/app/lib/worker.js"
}

（4）如果在群集模式下使用pm2，则在app.js和worker.js中添加一个require（'babel-register'）挂钩。如果您不使用pm2而不是群集模式，或者只是不使用pm2，那么您可以直接使用babel-node来运行.js或es6文件

最后，要检查是否真的安装了babel-node，您可以执行以下操作：

 heroku run bash -a {name of your app}
 ls ./node_modules/.bin //babel-node should be present

祝好运！