.default is not a valid Plugin property

Bug Report

Current Behavior When building my electron app with latest babel it will throw the following error:

ERROR in ./src/renderer/index.js Module build failed (from ./node_modules/babel-loader/lib/index.js): Error: [BABEL] /Users/rodrigopavezi/selfkey/github/Identity-Wallet/src/renderer/index.js: .default is not a valid Plugin property at Object.keys.forEach.key (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/validation/plugins.js:52:56) at Array.forEach (<anonymous>) at validatePluginObject (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/validation/plugins.js:50:20) at instantiatePlugin (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/full.js:209:55) at cachedFunction (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/caching.js:33:19) at loadPluginDescriptor (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/full.js:200:10) at config.plugins.reduce (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/full.js:69:20) at Array.reduce (<anonymous>) at recurseDescriptors (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/full.js:67:38) at loadFullConfig (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/config/full.js:108:6) at process.nextTick (/Users/rodrigopavezi/selfkey/github/Identity-Wallet/node_modules/@babel/core/lib/transform.js:28:33) at _combinedTickCallback (internal/process/next_tick.js:131:7) at process._tickCallback (internal/process/next_tick.js:180:9) @ multi (webpack)-dev-server/client?http://localhost:9080 (webpack)/hot/dev-server.js css-hot-loader/hotModuleReplacement ./src/renderer/index.js renderer[3]

Input Code Repo: https://github.com/SelfKeyFoundation/Identity-Wallet

Expected behavior/code It should build the app and run it normally as it working on version 7.0.0-beta.47

Babel Configuration (.babelrc, package.json, cli command)

{
	"presets": [
		[
			"@babel/preset-env",
			{
				"targets": {
					"node": "current"
				}
			}
		],
		"@babel/preset-react"
	],
	"plugins": [
		"@babel/plugin-proposal-class-properties"
	]
}

Environment

• Babel version(s): [v7.0.0]
• Node/npm version: [Node 8/yarn 1.9.4]
• OS: [OSX]
• How you are using Babel: [loader]

Cheers