Object.defineProperty called on non-object

[IanVS]

Hopefully this isn't just user error, since I'm new to rewire.

I am getting the following error when I change a require to a rewire:

TypeError: Object.defineProperty called on non-object
    at defineProperty (native)
    at Function.defineProperty (/mnt/sdb1/code/dev/sane/node_modules/traceur/bin/traceur.js:257:7)
    at Object.<anonymous> (/mnt/sdb1/code/dev/sane/lib/helpers/ember.js:29:8)
    at Module._compile (module.js:410:26)
    at Object.Module._extensions..js (/mnt/sdb1/code/dev/sane/node_modules/traceur/src/node/require.js:65:21)
    at Module.load (module.js:335:32)
    at Object.load (/mnt/sdb1/code/dev/sane/node_modules/rewire/lib/moduleEnv.js:19:18)
    at internalRewire (/mnt/sdb1/code/dev/sane/node_modules/rewire/lib/rewire.js:50:15)
    at rewire (/mnt/sdb1/code/dev/sane/node_modules/rewire/lib/index.js:11:12)
    at Object.<anonymous> (/mnt/sdb1/code/dev/sane/tests/unit/helpers/emberTest.js:4:13)

Where it seems to be failing in the module I'm requiring is here (ember.js:29:8):

  var globalPath = path.join(
      require.resolve('ember-cli')
      .replace(/\/lib\/cli\/index\.js$/, ''),
      'bin',
      'ember');

Any thoughts on what could be going wrong here? I can provide more info if you let me know what would be helpful. Thanks!

[jhnns]

Could you find out what traceur is trying to do?

Especially this line:

    at Function.defineProperty (/mnt/sdb1/code/dev/sane/node_modules/traceur/bin/traceur.js:257:7)

Currently I can't see that rewire has something to do with it.

[IanVS]

All it is doing is checking for a shim and then calling the object's normal defineProperty function.

253  function defineProperty(object, name, descriptor) {
254        if (isShimSymbol(name)) {
255          name = name[symbolInternalProperty];
256        }
257        $defineProperty(object, name, descriptor);
258        return object;
259      }

I'm not sure why this would be a problem in Treaeur, because everything works fine as long as I don't use rewire. Is there anything else I can do to try to help troubleshoot?

[jhnns]

You could create a minimal test-case that produces the error. And you could also check what value targetModule.id is here.

[IanVS]

Alright, I'll try to put something together in the next few days.

[IanVS]

OK, it seems that this occurs if the module being rewired exports a string or a variable with a string value. Is that not a supported use of rewire?

[jhnns]

@IanVS are you using mocha as test runner?

[jhnns]

OK, it seems that this occurs if the module being rewired exports a string or a variable with a string value. Is that not a supported use of rewire?

Sorry, I've over-read this.

Unfortunately yes, rewiring modules that export a primitive value is not possible, because the current API needs to attach methods like __set__ and __get__ to the export. I need to clarify that in my readme.