discord.js/lib/Util/Equality.js

/*
	The Equality Class is just used to show
	that a Class has an ID that can be used to
	check for equality.

	Never use == or === when comparing
	objects in discord.js, they will be different
	instances sometimes.

	Instead, use objectThatExtendsEquality.equals()
*/
class Equality {
	constructor() {}

	get eqDiscriminator() {
		return "id";
	}

	equals(object) {
		if (object && object[this.eqDiscriminator] == this[this.eqDiscriminator]) {
			return true;
		}
		return false;
	}

	equalsStrict(object) {
		// override per class type
		return;
	}
}

module.exports = Equality;