Error using transform-define

[sedubois]

An example of using transform-define for universal configuration is provided, but I have a weird error, which I narrowed down below (run it with babel-node):

// package.json
{
  "dependencies": {
    "babel-plugin-transform-define": "^1.2.0"
  },
  "babel": {
    "plugins": [
      [
        "transform-define",
        "./config.js"
      ]
    ]
  }
}

// config.js
module.exports = { KEY: 'value' };

// index.js
const config = require('./config');
console.log(config.KEY);

Somehow next manages to load my app based on the above principle just fine, but the console.log throws when I run the server myself (I'm trying to add integration tests):

TypeError: /Users/sdubois/Documents/relate-debug/index.js: Property property of MemberExpression expected node to be of a type ["Identifier"] but instead got "StringLiteral"
    at validate (/usr/local/lib/node_modules/babel-cli/node_modules/babel-types/lib/definitions/index.js:109:13)
    at Object.validate (/usr/local/lib/node_modules/babel-cli/node_modules/babel-types/lib/definitions/core.js:412:50)
    at Object.validate (/usr/local/lib/node_modules/babel-cli/node_modules/babel-types/lib/index.js:505:9)
    at NodePath._replaceWith (/usr/local/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/path/replacement.js:176:7)
    at NodePath.replaceWith (/usr/local/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/path/replacement.js:160:8)
    at replaceAndEvaluateNode (/Users/sdubois/Documents/relate-debug/node_modules/babel-plugin-transform-define/lib/index.js:111:12)
    at processNode (/Users/sdubois/Documents/relate-debug/node_modules/babel-plugin-transform-define/lib/index.js:148:5)
    at PluginPass.Identifier (/Users/sdubois/Documents/relate-debug/node_modules/babel-plugin-transform-define/lib/index.js:23:9)
    at newFn (/usr/local/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/visitors.js:276:21)
    at NodePath._call (/usr/local/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/path/context.js:76:18)

[sedubois]

Strangely enough, it works when I change to console.log(config['KEY'])).

[timneutkens]

// index.js = your custom server?
If you run it with babel-node it will transpile all occurences of KEY which might cause what you're seeing?

[sedubois]

OK it's because my custom server is normally simply started with node server, which doesn't do any babel stuff, but in my jest tests, the require('../../server') I'm using there is transformed by babel.

I'll try to adapt the babel config not to load that plugin in test env.

It's not trivial to get all the universal config right...

[sedubois]

@tim how can I set up my babel config, so that it doesn't transpile a certain folder (server/)?