npm test output

[DefinitelyMaybe]

(!) `this` has been rewritten to `undefined`
https://rollupjs.org/guide/en/#error-this-is-undefined
..\examples\jsm\libs\chevrotain.module.min.js
1: /*! chevrotain - v4.6.0 */
2: !function(t,e){"object"==ty

...

e.genNonTerminal=l,e.genAlternation=h,e.genSingleAlt=f}])});
^
3: export var chevrotain = window.chevrotain;
created unit/build/three.editor.unit.js in 11.6s

this huge output is printed every time I run npm test. Who, what, where, when and why?!

Is it just me?