A javascript version of SRL-6's _humanWindMouse from /lib/core/mouse.simba with modifications.

mouse.js

// Example:
// var mouseCalc = new MouseMovementCalculator(7, 5, 20, 200);
// var coordsAndDelay = mouseCalc.calcCoordsAndDelay([cursor.x, cursor.y], [destX, destY]);

function MouseMovementCalculator(gravity, wind, mouseSpeed, targetError){
  this.gravity = gravity;
  this.wind = wind;
  this.mouseSpeed = mouseSpeed;
  this.targetError = targetError;
}
MouseMovementCalculator.prototype.gravity = null;
MouseMovementCalculator.prototype.wind = null;
MouseMovementCalculator.prototype.mouseSpeed = null;
MouseMovementCalculator.prototype.targetError = null;
MouseMovementCalculator.prototype._windX = null;
MouseMovementCalculator.prototype._windY = null;

MouseMovementCalculator.prototype.calcCoordsAndDelay = function(startCoords, endCoords){
  var veloXY = [0, 0];
  var coordsAndDelay = [];
  var xs = startCoords[0];
  var ys = startCoords[1];
  var xe = endCoords[0];
  var ye = endCoords[1];
  var totalDist = Math.hypot(xs - xe, ys - ye);

  this._windX = 0;
  this._windY = 0;

  do{
    veloXY = this._calcVelocity([xs, ys], [xe, ye], veloXY, totalDist);
    xs += veloXY[0];
    ys += veloXY[1];

    var w = Math.round(Math.max(Math.floor(Math.random()*Math.round(100/this.mouseSpeed))*6, 5)*0.9);

    coordsAndDelay.push({ coords: [xs, ys], delay: w });
  }while(Math.hypot(xs - xe, ys - ye) >= 1);

  if (Math.round(xe) !== Math.round(xs) || Math.round(ye) !== Math.round(ys))
    coordsAndDelay.push({ coords: [Math.round(xe), Math.round(ye)], delay: 0 });

  return coordsAndDelay;
};

MouseMovementCalculator.prototype._calcVelocity = function(curCoords, endCoords, veloXY, totalDist){
  var veloX = veloXY[0];
  var veloY = veloXY[1];
  var xs = curCoords[0];
  var ys = curCoords[1];
  var xe = endCoords[0];
  var ye = endCoords[1];
  var dist = Math.hypot(xs - xe, ys - ye);
  this.wind = Math.max(Math.min(this.wind, dist), 1); // minE replaced with Math.min

  var maxStep;
  var D = Math.max(Math.min(Math.round(Math.round(totalDist)*0.3)/7, 25), 5);

  var rCnc = Math.floor(Math.random() * 6);
  if (rCnc === 1)
    D = 2;

  if (D <= Math.round(dist))
    maxStep = D;
  else
    maxStep = Math.round(dist);

  if (dist >= this.targetError) {
    this._windX = this._windX / Math.sqrt(3) + (Math.floor(Math.random() * Math.round(this.wind) * 2 + 1) - this.wind) / Math.sqrt(5);
    this._windY = this._windY / Math.sqrt(3) + (Math.floor(Math.random() * Math.round(this.wind) * 2 + 1) - this.wind) / Math.sqrt(5);
  }else{
    this._windX = this._windX / Math.sqrt(2);
    this._windY = this._windY / Math.sqrt(2);
  }

  veloX = veloX + this._windX;
  veloY = veloY + this._windY;
  
  if(dist !== 0){
    veloX = veloX + this.gravity * (xe - xs) / dist;
    veloY = veloY + this.gravity * (ye - ys) / dist;
  }

  if (Math.hypot(veloX, veloY) > maxStep) {
    var randomDist = maxStep / 2.0 + Math.floor(Math.random() * Math.floor(Math.round(maxStep) / 2));
    var veloMag = Math.sqrt(veloX * veloX + veloY * veloY);
    veloX = (veloX / veloMag) * randomDist;
    veloY = (veloY / veloMag) * randomDist;
  }

  return [veloX, veloY];
};