Calculating Euler's Number to nth digit in javascript

How to calculate Euler's Number to nth digit in JavaScript?

e   =   1/0! + 1/1! + 1/2! + ...    
    =   2.7182818284590...to nth digit  (base 10)

Below code returns only number to 16 decimal point and accuracy is depend upon to the number of iterations/or number passed to function.

Code

function calcE(n) {
  let euler, itr;
  euler = 0
  itr = Number(n)
    for (var i = 0; i < itr+1; i++) {
      let fact = factorial(i)
      euler += 1/fact
    }
  return euler;
}

Demo: miniwebtool

Found a solution by using npm decimal.js package to handle big decimal.

Euler

function euler(n) {
  let zero = new Decimal(0);
  let one = new Decimal(1);
  let rval;

  for (let i = 0; i <= n; i++) {
    let fval = factorial(i);
    let invert = one.dividedBy(fval)
    zero = zero.plus(invert)
  }
  rval = zero.toFixed(Number(n))
  return rval;
}

function factorial(n) {
  var i = 2,
    r = new Decimal(1);
  for (; i <= n; r = r.times(i++));
  return r;
}

Still not able to compute very large values. An Suggestions?