nl_tokens: Return item mapper object with fromService and toService .
pl_tokens: function mapping ( { filters , transformers , schemas = { } , mappings : mappingsArr = [ ] } = { } ) { const mappings = mappingsArr . reduce ( ( mappings , def ) => ( { ... mappings , [ def . id ] : def } ) , { } ) const createPipelineFn = createPipeline ( filters , transformers , schemas , mappings ) return ( mapping , overrideType ) => { const { id , <mask> , schema , pipeline } = createPipelineFn ( mapping , overrideType ) if ( ! pipeline ) { return null } const mapper = mapTransform ( [ fwd ( 'data' ) , ... pipeline , rev ( set ( 'data' ) ) ] ) return { id , type , schema , /**
         * Map data from a service with attributes and relationships.
         * @param {Object} data - The service item to map from
         * @param {Object} options - onlyMappedValues
         * @returns {Object} Target item
         */ fromService ( data , { onlyMappedValues = true } = { } ) { return data ? ensureArray ( ( onlyMappedValues ) ? mapper . onlyMappedValues ( data ) : mapper ( data ) ) : [ ] } , /**
         * Map data to a service with attributes and relationships.
         * @param {Object} data - The data item to map
         * @param {Object} target - Optional object to map to data on
         * @returns {Object} Mapped data
         */ toService ( data , target = null ) { const mapped = mapper . rev . onlyMappedValues ( data ) return ( ( target ? Array . isArray ( target ) ? [ ... target ] . concat ( mapped ) : mergeDeepWith ( concatOrRight , target , mapped ) : mapped ) || null ) } } } }