NPM错误找不到当前的“ es2015”-babel / node / react

Question

I'm getting the following NPM error when I deploy to Heroku. My project is a mern stack .

Error: Couldn't find preset "es2015" relative to directory "/app"

Packages seem to be installed correctly, I have a .babelrc file set up correctly, and nothing is different locally compared to remote other than the parent directories are different. On Heroku, the parent directory is obviously "app". These are my NPM packages:

  "dependencies": {
    "babel-core": "^6.7.2",
    "babel-polyfill": "^6.7.4",
    "body-parser": "~1.12.0",
    "cookie-parser": "~1.3.4",
    "css-modules-require-hook": "^4.0.0",
    "debug": "~2.1.1",
    "express": "~4.12.2",
    "react": "^0.14.7",
    "react-dom": "^0.14.7",
    "react-redux": "^4.4.1",
    "react-router": "^2.0.1",
    "redux": "^3.3.1",
    "serve-favicon": "~2.2.0",
    "webpack": "^1.12.13"
  },
  "devDependencies": {
    "babel-eslint": "^5.0.0",
    "babel-loader": "^6.2.4",
    "babel-plugin-react-transform": "^2.0.2",
    "babel-polyfill": "^6.7.4",
    "babel-preset-es2015": "^6.6.0",
    "babel-preset-react": "^6.5.0",
    "babel-preset-react-hmre": "^1.1.1",
    "babel-register": "^6.7.2",
    "css-modules-require-hook": "^4.0.0",
    "redux-devtools": "^3.1.1",
    "redux-devtools-dock-monitor": "^1.1.0",
    "redux-devtools-log-monitor": "^1.0.4",
    "webpack-dev-middleware": "^1.5.1",
    "webpack-hot-middleware": "^2.10.0"
  }

Furthermore, npm start runs index.js which consists of the following:

require('babel-core/register');
require('babel-polyfill');
require('css-modules-require-hook');
require('./server/index');

I actually was getting errors with babel-polyfill and css-modules-require-hook not being found or something (I can't remember unfortunately) but when I added them from my devDependencies to my dependencies, it seemed to resolve itself. It's rather difficult to determine what packages to put where actually (any tips?). I'd really appreciate some direction!

Answer 1

From what i understand, heroku defaults to adding the --production flag, which inturn doesnt install your devdependencies. I'd move all necessary dependencies to create your build to devDep to dependencies. or

heroku config:set NPM_CONFIG_PRODUCTION=false