I'm currently building a third party package and I want to add some prototypes but I don't know whether my prototypes would conflict users prototypes

for example, I have this prototype:

if (!Array.prototype.isDistinct) {
  Array.prototype.isDistinct = function () {
    return this.length === new Set(this).size
  }
}

and the user has this prototype

if (!Array.prototype.isDistinct) {
  Array.prototype.isDistinct = function () {
    return 'test'
  }
}

will my prototype overwrite users or any other third-party package prototypes?