Static deep properties

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The static deep properties are properties attached to stamp itself. But unlike regular (shallow) static properties these are deeply merged together by stamp deep merging algorithm.
const SchemaTypes = stampit.deepStatics({
  Types: {
    String,
    Number,
    Array
  }
})
​
const ObjectIdSchemaType = stampit.deepStatics({
  Types: {
    ID: String,
    ObjectId: require('./object-id')
  }
})
​
const Schema = stampit(SchemaTypes, ObjectIdSchemaType, { // stamp deep merging kicks in this line
  init(data, { stamp }) {
    // stamp.Types.String, stamp.Types.ID, ...
  }
})
​
// Schema.Types.String
// Schema.Types.Number
// Schema.Types.Array
// as well as
// Schema.Types.ID
// Schema.Types.ObjectId
Descriptor merging algorithm
The staticDeepProperties are deeply merged using stamp deep merging algorithm. See below - the Types value is always a new object.
SchemaTypes.Types !== Schema.Types // NEVER EQUAL! NO MATTER WHAT!
Sometimes a regular (shallow) static property has the same name as a deep static property. The shallow static property always wins.
const NullTypes = stampit.statics({
  Types: null
})
​
const NoTypesSchema = Schema.compose(NullTypes)
​
NoTypesSchema.Types === null // the regular property overwrites deep property
Other ways to add static deep properties
Exactly the same stamp can be created in few ways. Here they all are.
const myTypes = { String, ID: String, Number, Array }
​
const AuthServiceToken = stampit({
  deepStatics: {
    Types: myTypes
  }
})
​
const HasLog = stampit({
  staticDeepProperties: {
    Types: myTypes
  }
})
​
const HasLog = stampit.deepStatics({
  Types: myTypes
})
​
const HasLog = stampit.staticDeepProperties({
  Types: myTypes
})
​
const HasLog = stampit().deepStatics({
  Types: myTypes
})
​
const HasLog = stampit().staticDeepProperties({
  Types: myTypes
})

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Last modified 4yr ago

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Outline

Descriptor merging algorithm

Other ways to add static deep properties