Chartjs-NPM module doesn't work with Webpack 3 but works with vue-cli3 which based on Webpack 4

The example code you gave in the beginning: “I paid attention that it doesn’t have module.exports = … neither export default”

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' 
? factory(require('chart.js')) 
: typeof define === 'function' && define.amd ? define(['chart.js'], factory) :
    (factory(global.Chart));
}(this, (function (Chart) { 'use strict';
...
})));

Above says:

If on the system this code is running has export as an object and module does exist, do factory(require(‘chart.js’)

ELSE

if define equals function and define.amd exists then define([‘chart.js’], factory)

AND

if none of the above exist just do factory(global.Chart)

Did you do:

“npm install vue-chartjs chart.js –save”

or just

“npm install vue-chartjs –save”

Chart.js is a peer-dependency and needed, the last option will not work.

npm install chartjs –save will do the trick I think