[BUG] Cannot read property 'add' of undefined

Here’s my .babelrc:

babelrc

{
  "presets": [
    "es2015", "stage-2", "stage-0", "react", "es2015-ie"
  ],
  "plugins": [
    "transform-runtime", "transform-decorators-legacy", "transform-class-properties"
  ],
  "compact": true,
  "env": {
    "test": {
      "plugins": ["istanbul"]
    },
    "production": {
      "presets": [
         "babili"
      ]
    }
  }
}

Running babel resulted in this error:

ERROR in ./src/components/Main/index.js
Module build failed: TypeError: /src/components/Main/index.js: Cannot read property 'add' of undefined
    at ScopeTracker.addReference (/node_modules/babel-plugin-minify-mangle-names/lib/scope-tracker.js:55:36)
    at ReferencedIdentifier (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:190:28)
    at newFn (/node_modules/babel-traverse/lib/visitors.js:318:17)
    at bfsTraverse (/node_modules/babel-plugin-minify-mangle-names/lib/bfs-traverse.js:34:43)
    at Mangler.collect (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:269:9)
    at Mangler.run (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:70:14)
    at PluginPass.exit (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:589:19)
    at newFn (/node_modules/babel-traverse/lib/visitors.js:276:21)
    at NodePath._call (/node_modules/babel-traverse/lib/path/context.js:76:18)
    at NodePath.call (/node_modules/babel-traverse/lib/path/context.js:48:17)
    at NodePath.visit (/node_modules/babel-traverse/lib/path/context.js:117:8)
    at TraversalContext.visitQueue (/node_modules/babel-traverse/lib/context.js:150:16)
    at TraversalContext.visitSingle (/node_modules/babel-traverse/lib/context.js:108:19)
    at TraversalContext.visit (/node_modules/babel-traverse/lib/context.js:192:19)
    at Function.traverse.node (/node_modules/babel-traverse/lib/index.js:114:17)
    at traverse (/node_modules/babel-traverse/lib/index.js:79:12)
    at File.transform (/node_modules/babel-core/lib/transformation/file/index.js:548:35)
    at /node_modules/babel-core/lib/transformation/pipeline.js:50:19
    at File.wrap (/node_modules/babel-core/lib/transformation/file/index.js:564:16)
    at Pipeline.transform (/node_modules/babel-core/lib/transformation/pipeline.js:47:17)
    at transpile (/node_modules/babel-loader/lib/index.js:46:20)
    at Object.module.exports (/node_modules/babel-loader/lib/index.js:163:20)
 @ ./src/dist.js 1:127-153

Now if I disable Mangling, the minification doesn’t seem to have much effect:

npm run dist

> BABEL_ENV=production webpack --env=dist

Hash: b6d52d6cc9478801536d
Version: webpack 1.15.0
Time: 4355ms
               Asset    Size  Chunks             Chunk Names
    dist.js  749 kB       0  [emitted]  main
dist.js.map  923 kB       0  [emitted]  main
    + 340 hidden modules

Dist without production env:

> webpack --env=dist

Hash: 8636992c125a9a4e5f8a
Version: webpack 1.15.0
Time: 3934ms
               Asset    Size  Chunks             Chunk Names
    dist.js  752 kB       0  [emitted]  main
    dist.js.map  925 kB       0  [emitted]  main
    + 340 hidden modules

[julienvincent]

After upgrading babel to latest version I am still experiencing this issue

[ilya-lopukhin]

For me works with this configuration only:

{
...
  "env": {
    "production": {
      "presets": [
      ...
        [
          "minify",
          {
            "mangle": false,
            "evaluate": false
          }
        ]
      ]
    }  
  },
...
}