ERROR in js/vendor.js from UglifyJs Unexpected Token

[shane3q]

My plugin is failing at npm run build. It errors out each time with the following:

ERROR in js/vendor.js from UglifyJs
Unexpected token: name (hook) [js/vendor.js:15344,8]
Child html-webpack-plugin for "pages/app.html":
     1 asset
Child html-webpack-plugin for "pages/popup.html":
     1 asset
Child html-webpack-plugin for "pages/options.html":
     1 asset
Child html-webpack-plugin for "pages/background.html":
     1 asset

Looks like a problem with uncompiled ES6. Is anyone else facing this issue?