Object.defineProperty alternative for IE8

IE8 does not support getter/setter functions on properties of non DOM objects.

The "solution" here is to not rely on property getters, and use a full getter function instead.

AutosizeInput.prototype.getOptions = function() {
  return this._options;
};

var input = new AutoresizeInput();
input.getOptions();

Or, instead of keeping this._options as an "internal" variable, just drop the underscore allow access directly. This way you need no magic at all.

var AutoresizeInput = function() {
  this.options = {};
}

var input = new AutoresizeInput();
input.options();

You can create your own something like

 if (!Object.defineProperty) {
            Object.defineProperty = function (obj, prop, descriptor) {
                if (arguments.length < 3) { // all arguments required
                    throw new TypeError("Arguments not optional");
                }
                
                prop += ""; // convert prop to string
                ...     

You can find the rest of the code here:

• https://github.com/es-shims/es5-shim/blob/master/es5-sham.js