MetadataKey — Angular

Represents metadata that is aggregated from multiple parts according to the key's reducer function. A value can be contributed to the aggregated value for a field using an metadata rule in the schema. There may be multiple rules in a schema that contribute values to the same MetadataKey of the same field.

API

class MetadataKey<TRead, TWrite, TAcc> {
  protected constructor(reducer: MetadataReducer<TAcc, TWrite>, create: ((state: FieldState<unknown, string | number>, data: Signal<TAcc>) => TRead) | undefined): MetadataKey<TRead, TWrite, TAcc>;
}

constructor

MetadataKey<TRead, TWrite, TAcc>

Use createMetadataKey.

@paramreducerMetadataReducer<TAcc, TWrite>

@paramcreate((state: FieldState<unknown, string | number>, data: Signal<TAcc>) => TRead) | undefined

@returnsMetadataKey<TRead, TWrite, TAcc>