Recent change results in build failure babel/polyfill 7.4.3

Bug Report

Current Behavior

ERROR in bundle.5ecbe226d86cc8df5e59.js from UglifyJs
Unexpected token: keyword «const» [./node_modules/@babel/polyfill/lib/index.js:6,0][bundle.5ecbe226d86cc8df5e59.js:95888,2]
Child extract-css-chunks-webpack-plugin node_modules/css-loader/index.js!node_modules/sass-loader/lib/loader.js??ref--8-2!node_modules/@salesforce-mc/blockstandardcomponents/components/emoji-picker/emoji-picker.scss:

Input Code Not sure where the code is, but if you navigate to the file its complaining about (node_modules/@babel/polyfill/lib/index.js) you can see a definition for the global function

function _global() {
  const data = _interopRequireDefault(require("core-js/library/fn/global"));

  _global = function () {
    return data;
  };

  return data;
}

Changing const data to just be var data results in the build passing again.

Expected behavior/code The build should pass without issue…

Environment

• Babel version(s): 7.4.3
• Node/npm version: Node 8/npm 5.5.1
• OS: OSX
• Monorepo: ehh…?
• How you are using Babel: [e.g. cli, register, loader]

Possible Solution Change const to var and it works fine…

Additional context/Screenshots

[infolock]

fwiw, 7.4.0 builds fine as well

[artemave]

What is the ETA on the fix being released?