Property id of VariableDeclarator expected node to be of a type ["LVal"] but instead got null

[bmathews]

This code is causing this error:

Property id of VariableDeclarator expected node to be of a type ["LVal"] but instead got null

function test() {
  if (false) {
    for (var i = 0; i < 3; i++) {
      var something = 5;
    }
  }
}

test();

Here's a link to the repl demonstrating it:

http://babeljs.io/repl/#?babili=true&evaluate=false&lineWrap=false&presets=&targets=&browsers=&builtIns=false&code=function%20test()%20%7B%0A%20%20if%20(false)%20%7B%0A%20%20%20%20for%20(var%20i%20%3D%200%3B%20i%20%3C%203%3B%20i%2B%2B)%20%7B%0A%20%20%20%20%20%20var%20something%20%3D%205%3B%0A%20%20%20%20%7D%0A%20%20%7D%0A%7D%0A%0Atest()%3B&experimental=false&loose=false&spec=false&playground=true

Stack trace:

TypeError: unknown: Property id of VariableDeclarator expected node to be of a type ["LVal"] but instead got null
    at Object.validate (/usr/local/lib/node_modules/babili/node_modules/babel-types/lib/definitions/index.js:109:13)
    at validate (/usr/local/lib/node_modules/babili/node_modules/babel-types/lib/index.js:509:9)
    at Object.builder (/usr/local/lib/node_modules/babili/node_modules/babel-types/lib/index.js:470:7)
    at VariableDeclaration (/usr/local/lib/node_modules/babili/node_modules/babel-plugin-minify-dead-code-elimination/lib/index.js:935:34)
    at NodePath._call (/usr/local/lib/node_modules/babili/node_modules/babel-traverse/lib/path/context.js:76:18)
    at NodePath.call (/usr/local/lib/node_modules/babili/node_modules/babel-traverse/lib/path/context.js:48:17)
    at NodePath.visit (/usr/local/lib/node_modules/babili/node_modules/babel-traverse/lib/path/context.js:105:12)
    at TraversalContext.visitQueue (/usr/local/lib/node_modules/babili/node_modules/babel-traverse/lib/context.js:150:16)
    at TraversalContext.visitSingle (/usr/local/lib/node_modules/babili/node_modules/babel-traverse/lib/context.js:108:19)
    at TraversalContext.visit (/usr/local/lib/node_modules/babili/node_modules/babel-traverse/lib/context.js:192:19)

---

Edit: Updated with less code to reproduce and added stack trace

[bmathews]

🙇 thanks!

[niksajanjic]

I'm getting the same error:
Property id of VariableDeclarator expected node to be of a type ["LVal"] but instead got null

On the latest version of babel-core@6.26.0 with the following code (this is not the actual code, but it's numbed down to pinpoint the issue):

const configureStore = env => {
  return {
    store: 'store',
    persistor: 'persistor'
  }
}

export const { store, persistor } = configureStore(process.env.NODE_ENV)

But if I just change the code slightly by moving process.env.NODE_ENV to a function parameter and making it default value, it will compile:

const configureStore = (env = process.env.NODE_ENV) => {
  return {
    store: 'store',
    persistor: 'persistor'
  }
}

export const { store, persistor } = configureStore()

If needed, I can paste the actual code. This is strange, but I'm not sure if it's valuable to open a new issue for that. Any thoughts? Does it make sense to open a separate issue for this?

[jakesylvestre]

@niksajanjic I think so