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Hei,

I updated my npm packages, including parcel, and after the update I could not run my application anymore and keep getting the following error:

     Build failed.
@parcel/transformer-js: This experimental syntax requires enabling one of the following parser plugin(s): 'classPrivateProperties, classPrivateMethods' (3:2)

My package.json looks like below:

"scripts": {
    "start": "parcel index.html",
    "build": "parcel build index.html"
  },
  "author": "Klei Rama",
  "license": "ISC",
  "devDependencies": {
    "@babel/plugin-proposal-class-properties": "^7.13.0",
    "@babel/plugin-proposal-private-methods": "^7.13.0",
    "@parcel/transformer-sass": "^2.0.0-beta.2",
    "parcel": "^2.0.0-beta.2",
    "sass": "^1.32.8"
  },
  "dependencies": {
    "fractional": "^1.0.0"
  },
  "plugins": [
    "@babel/plugin-proposal-private-methods",
    "@babel/plugin-proposal-class-properties"
  ]
}

I keep trying to delete node_modules, clear the cache, and delete package.json and then reinstall again but it does not work. I tried to use experimantal versions of parcel such as 2.0.0-beta.1 and 2.0.0-beta.2, but none of these version does not seem to work with experimental phase of babel plugins (class-properties and private-methods) (7.13.0). I was wondering if there is any certain version of babel plugins which can work either with parcel 2.0.0-beta.1 or 2.0.0-beta.2?

kr90
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1 Answers1

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Hei you, install babel and the following plugins:

{
  "plugins": [
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-proposal-private-methods"
  ]
}

Of course, also, to file .babelrc.

Minal Chauhan
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Fabiano Araujo
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