Mongoose ObjectId type

Hello, I’m trying to grasp mongoose .populate() method. When we are declaring a field in Schema we are pointing to type of the field using key/value pairs like:

const personSchema = Schema({
  name: String,

However when we are declaring the field that only have an ID reference to the other model like this:

const personSchema = Schema({
  stories: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Story' }],

we need to use this long mongoose.Schema.Types.ObjectId. Why we can’t just use something like ObjectId since when we are declaring the string for example we only write String - not mongoose.Schema.Types.String?

because String, Number etc… are global in node

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