How to recalibrate/reset Magnetometer?

Why not use
var vec3 = require("Vec3"); //no errors

var vec3 = require("Vec3"); //no errors

console.log(vec3);

 1v96 (c) 2017 G.Williams
>function (a,b,c) {"object"==typeof a?this.set(a.x,a.y,a.z):"number"==typeof a?this.set(a,b,c):this.set(0,0,0)}
=undefined
>