Preset files are not allowed to export objects

You’re using a combination of Babel 6 and Babel 7. There is no guarantee of compatibility across versions:

"@babel/core": "^7.0.0-beta.40",
"babel-cli": "^6.26.0",
"babel-loader": "^8.0.0-beta.0",
"babel-plugin-lodash": "^3.3.2",
"babel-plugin-react-transform": "^3.0.0",
"babel-preset-react": "^6.24.1",

should be

"@babel/core": "^7.0.0-beta.40",
"@babel/cli": "^7.0.0-beta.40",
"babel-loader": "^8.0.0-beta.0",
"babel-plugin-lodash": "^3.3.2",
"babel-plugin-react-transform": "^3.0.0",
"@babel/preset-react": "^7.0.0-beta.40",

and

    query: {
      presets: ['react', 'es2015'],
      plugins: ['transform-class-properties']
    }

would be

    query: {
      presets: ['@babel/react', '@babel/es2015'],
      plugins: ['@babel/proposal-class-properties']
    }

I’m also confused because you didn’t mention @babel/proposal-class-properties in your package.json, but assuming it is in there it should also be updated.

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