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.
constructor
MetadataKey<TRead, TWrite, TAcc>Use reducedMetadataKey.
@returns
MetadataKey<TRead, TWrite, TAcc>Jump to details