Error: The 'decorators' plugin requires a 'decoratorsBeforeExport' option

[gotjoshua]

Atom 1.29.0 - Mac 10.11 - in a meteor project - cmd-shift-i gives this error:

Uncaught (in promise) Error: Error: The 'decorators' plugin requires a 'decoratorsBeforeExport' option, whose value must be a boolean.
    at new Importer (/Users/usernam/.atom/packages/atom-import-js/node_modules/import-js/build/Importer.js:118)
    at getImporter (/Users/usernam/.atom/packages/atom-import-js/lib/getImporter.js:8)
    at withModuleFinder (/Users/usernam/.atom/packages/atom-import-js/lib/import-js.js:121)
    at initializeModuleFinder.then.catch (/Users/usernam/.atom/packages/atom-import-js/lib/withModuleFinder.js:8)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188)
Importer @ /Users/usernam/.atom/packages/atom-import-js/node_modules/import-js/build/Importer.js:118
getImporter @ /Users/usernam/.atom/packages/atom-import-js/lib/getImporter.js:8
withModuleFinder @ /Users/usernam/.atom/packages/atom-import-js/lib/import-js.js:121
initializeModuleFinder.then.catch @ /Users/usernam/.atom/packages/atom-import-js/lib/withModuleFinder.js:8
_tickCallback @ internal/process/next_tick.js:188
Promise rejected (async)
withModuleFinder @ /Users/usernam/.atom/packages/atom-import-js/lib/withModuleFinder.js:6
fixImports @ /Users/usernam/.atom/packages/atom-import-js/lib/import-js.js:120
import-js:fix-imports @ /Users/usernam/.atom/packages/atom-import-js/lib/import-js.js:155
handleCommandEvent @ commitCommentContainer_item.graphql.js:112
module.exports.KeymapManager.dispatchCommandEvent @ commitCommentContainer_item.graphql.js:112
module.exports.KeymapManager.handleKeyboardEvent @ commitCommentContainer_item.graphql.js:112
handleDocumentKeyEvent @ commitCommentContainer_item.graphql.js:112

any known workarounds

[trotzig]

Hi! Sorry you're hitting this issue!

The same thing has been reported upstream as well: Galooshi/import-js#515. The workaround is to install an older version of the plugin, or switch your project over to babel 7 (I think).

[gotjoshua]

Hey Thanks for your reply!

It seems that the decorators plugin requires an explicit value now...
babel/babel#8562

but I don't get where to set it... Is atom-import-js using a decorators plugin?
does it belong in my project .babelrc?

I have a Meteor project (METEOR@1.7.1-rc.5)
and i am not using any decorators plugin at the top level - could this be an issue that comes from a sub-dependency?

[gotjoshua]

I want to cross post a meteor thread here, because I really want to get to the bottom of this error:
https://forums.meteor.com/t/babel-what-is-required-where-and-why/45420/2

Would changes to my project's babelrc file affect the operation of the atom-import-js package?

I downgraded to atom-import-js 0.14.0, by uninstalling and then running:
apm install atom-import-js@0.14.0
Now i don't get the error anymore... but i still want to understand how to update.

Also curiously enough my colleague is able to run v0.15.0 in the same project repo!

hoping for insight...

[the-simian]

Don't forget the babel-eslint flag if you're using this babel/babel-eslint#679 , that also changed very recently and that got me.

ecmaFeatures: {
  legacyDecorators: true
}

[gotjoshua]

Thanks!
does that belong in the .eslintrc file? if so, as a top level option? or under parser options?

[the-simian]

parser options like

{
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": {
      "modules": true,
      "legacyDecorators": true
    }
  },
//... rest of linter file
}

[trotzig]

It looks like this is the same issue as Galooshi/import-js#515. Any help debugging this is deeply appreciated 🙏.

[kakenbok]

Don't forget the babel-eslint flag if you're using this babel/babel-eslint#679 , that also changed very recently and that got me.

ecmaFeatures: {
  legacyDecotators: true
}

Mind the typo:

legacyDecota--->t<---ors

This worked well for me:

  parserOptions: {
    parser: 'babel-eslint',
    'ecmaFeatures': {
      'legacyDecorators': true
    }
  }

[the-simian]

@kakenbok fixed spelling on initial comment! thanks