stampit API
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Static deep properties
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.
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const SchemaTypes = stampit.deepStatics({
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Types: {
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String,
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Number,
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Array
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}
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})
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const ObjectIdSchemaType = stampit.deepStatics({
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Types: {
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ID: String,
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ObjectId: require('./object-id')
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}
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})
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const Schema = stampit(SchemaTypes, ObjectIdSchemaType, { // stamp deep merging kicks in this line
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init(data, { stamp }) {
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// stamp.Types.String, stamp.Types.ID, ...
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}
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})
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// Schema.Types.String
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// Schema.Types.Number
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// Schema.Types.Array
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// as well as
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// Schema.Types.ID
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// Schema.Types.ObjectId
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Descriptor merging algorithm
The staticDeepProperties are deeply merged using stamp deep merging algorithm. See below - the
Types value is always a new object.1
SchemaTypes.Types !== Schema.Types // NEVER EQUAL! NO MATTER WHAT!
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Sometimes a regular (shallow) static property has the same name as a deep static property. The shallow static property always wins.
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const NullTypes = stampit.statics({
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Types: null
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})
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const NoTypesSchema = Schema.compose(NullTypes)
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NoTypesSchema.Types === null // the regular property overwrites deep property
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Other ways to add static deep properties
Exactly the same stamp can be created in few ways. Here they all are.
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const myTypes = { String, ID: String, Number, Array }
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const AuthServiceToken = stampit({
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deepStatics: {
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Types: myTypes
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}
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})
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const HasLog = stampit({
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staticDeepProperties: {
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Types: myTypes
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}
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})
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const HasLog = stampit.deepStatics({
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Types: myTypes
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})
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const HasLog = stampit.staticDeepProperties({
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Types: myTypes
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})
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const HasLog = stampit().deepStatics({
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Types: myTypes
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})
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const HasLog = stampit().staticDeepProperties({
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Types: myTypes
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})
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Last modified 4yr ago
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