Vuejs + vue-router + vuex + bootstrap4 = 1.5MB, after UglifyJS 400KB, how to reduce?

Question

Bootstrap

I assembled a minimal project from Vuejs + vue-router + vuex + bootstrap4 (+ bootstrap-vue), after building bundle.js one and a half megabytes are obtained, after minification - 650 kb. The size of my sources is about 30kb. I understand that when the application is filled, it will not grow so much, but still the question is - can it be reduced?
UPD: after carefully looking at the output, I saw an error:

spoiler

ERROR in build.js from UglifyJs
Unexpected token: name (src) [build.js:14073,8]

in that place is a completely unsuspicious thing:

в чем дело?

UPD: added es2015 preset to .babelrc, Uglify compiled everything, ~400kb result. Can you squeeze more?
UPD: separated .css with extract-text-plugin,

Asset      Size  Chunks             Chunk Names
     build.js    244 kB       0  [emitted]  main
    style.css    139 kB       0  [emitted]  main
 build.js.map   1.44 MB       0  [emitted]  main
style.css.map  86 bytes       0  [emitted]  main

Answer 1

Compressing with canvas and PNG images

Answer 2

Abandon Bootstrap?