Cannot redefine property: __Rewire__ after build

[mfrachet]

I m using this library to make rewire inside of a project and I m having some troubles while requiring the due module in another one.

My module is the following : https://github.com/Skahrz/express-konnector

I try to use the express-konnector (locally) from that little script called index.js :

/* ... */
const expressKonnector = require('../express-konnector')
expressKonnector(app, injector, routeParser)
/*...*/

And when I try to run the script using :

node index.js

I have the following error that is thrown :

C:\Project\javascript\express-konnector\dist\app.js:1
(function (exports, require, module, __filename, __dirname) { "use strict";function _interopRequireDefault(e){return e&&e.__esModule?e:{"default":e}}function __GetDependency__(e){return __$Getters__[e]()}function __Rewire__(e,_){__$Setters__[e](_)}function __ResetDependency__(e){__$Resetters__[e]()}Object.defineProperty(exports,"__esModule",{value:!0});var _appExpressKonnector=require("./app/expressKonnector"),_appExpressKonnector2=_interopRequireDefault(_appExpressKonnector),__$Getters__=[],__$Setters__=[],__$Resetters__=[],__RewireAPI__={__GetDependency__:__GetDependency__,__get__:__GetDependency__,__Rewire__:__Rewire__,__set__:__Rewire__,__ResetDependency__:__ResetDependency__},expressKonnector=_appExpressKonnector2["default"];__$Getters__.expressKonnector=function(){return expressKonnector},__$Setters__.expressKonnector=function(e){expressKonnector=e},__$Resetters__.expressKonnector=function(){expressKonnector=_appExpressKonnector2["default"]};var _d

TypeError: Cannot redefine property: __Rewire__
    at Function.defineProperty (native)
    at Object.<anonymous> (C:\Project\javascript\express-konnector\dist\app.js:1:1077)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (C:\Project\javascript\test\t.js:6:26)
    at Module._compile (module.js:409:26)

I m using (for building the lib) :

• node v4.4.3
• "babel-core": "^5.5.0",
• "babel-plugin-rewire": "^0.1.22",
• "babel-preset-es2015": "^6.5.0",

my .babel.rc :

{
  "plugins":[
    "babel-plugin-rewire"
  ]
}

Any idea of how to correct it ?

[speedskater]

@Skahrz thanks for reporting the issue. I will have a look at the problem on monday. Would it be possible tfor you o create a PR with a failing sample in the mean time?

[speedskater]

@Skahrz sorry for the long delay, in tackling your issue. Do you have more details on how to reproduce it (or is it already fixed in 1.0.0 ?)

[2Steaks]

Not sure if it's related but I'm getting Uncaught TypeError: Cannot redefine property: __get__
with Karma and Webpack.

but only when Karma points to a single file which requires all other test files:
const tests = require.context('.', true, /\.test\.js$/); tests.keys().forEach(tests);

If Karma is setup to find and process all test files (without the require.context) it works.

[eventlistener]

I managed to make a minimal reproducible example, see eventlistener/babel-plugin-rewire-issue-144#1.

It's a subtle issue where the following conditions need to be met in order to reproduce it:

• The entry point should (directly or indirectly) import a module that contains at least two re-exports in the form export * from ...
• At least two of the re-exported modules should be considered rewireable by the plugin (e.g. their exported function(s) should reference a variable from outer scope)

The re-exporting module can be located anywhere, including node_modules. Whether or not any methods provided by the plugin are used at all doesn't matter either.

[BenjaminVanRyseghem]

any update on this issue? I'm quite stuck right now, and I don't really know how to workaround this issue 😕

[BenjaminVanRyseghem]

is there a way to prevent this plugin to apply to a dependency?

In my case, I know which dependency is triggering the issue, and I don't need to apply rewire to it. Is there a way, either as a plugin argument, or directly into babel to prevent rewire to apply on this specific dep?

[BenjaminVanRyseghem]

to answer my own question, I ended up having a babel.config.js looking like:

module.exports = {
	env: {},
	overrides: [
		{
			include: (filename) => filename.indexOf("/node_modules/") !== -1,
			env: {
				test: {
					plugins: ["@babel/plugin-transform-modules-commonjs"],
				},
			},
		},
		{
			exclude: (filename) => filename.indexOf("/node_modules/") !== -1,
			env: {
				test: {
					plugins: [
						"rewire",
						"@babel/plugin-transform-modules-commonjs",
					],
				},
			},
		},
	],
};

Hope it helps