Preview: Introduce Result, Record and Graph types mapping

package.json

@@ -3,6 +3,7 @@
   "private": true,
   "type": "module",
   "devDependencies": {
+    "@types/node": "^24.0.10",
     "husky": "^8.0.3",
     "lerna": "^4.0.0",
     "lint-staged": "^14.0.0",

packages/core/src/graph-types.ts

@@ -16,6 +16,7 @@
  */
 import Integer from './integer'
 import { stringify } from './json'
+import { Rules, GenericConstructor, as } from './mapping.highlevel'
 
 type StandardDate = Date
 /**
@@ -82,6 +83,24 @@ class Node<T extends NumberOrInteger = Integer, P extends Properties = Propertie
     this.elementId = _valueOrGetDefault(elementId, () => identity.toString())
   }
 
+  /**
+   * Hydrates an object of a given type with the properties of the node
+   *
+   * @param {GenericConstructor<T> | Rules} constructorOrRules Contructor for the desired type or {@link Rules} for the hydration
+   * @param {Rules} [rules] {@link Rules} for the hydration
+   * @returns {T}
+   *
+   * @experimental Part of the Record Object Mapping preview feature
+   */
+  as <T extends {} = Object>(rules: Rules): T
+  as <T extends {} = Object>(genericConstructor: GenericConstructor<T>): T
+  as <T extends {} = Object>(genericConstructor: GenericConstructor<T>, rules?: Rules): T
+  as <T extends {} = Object>(constructorOrRules: GenericConstructor<T> | Rules, rules?: Rules): T {
+    return as({
+      get: (key) => this.properties[key]
+    }, constructorOrRules, rules)
+  }
+
   /**
    * @ignore
    */
@@ -199,6 +218,24 @@ class Relationship<T extends NumberOrInteger = Integer, P extends Properties = P
     this.endNodeElementId = _valueOrGetDefault(endNodeElementId, () => end.toString())
   }
 
+  /**
+   * Hydrates an object of a given type with the properties of the relationship
+   *
+   * @param {GenericConstructor<T> | Rules} constructorOrRules Contructor for the desired type or {@link Rules} for the hydration
+   * @param {Rules} [rules] {@link Rules} for the hydration
+   * @returns {T}
+   *
+   * @experimental Part of the Record Object Mapping preview feature
+   */
+  as <T extends {} = Object>(rules: Rules): T
+  as <T extends {} = Object>(genericConstructor: GenericConstructor<T>): T
+  as <T extends {} = Object>(genericConstructor: GenericConstructor<T>, rules?: Rules): T
+  as <T extends {} = Object>(constructorOrRules: GenericConstructor<T> | Rules, rules?: Rules): T {
+    return as({
+      get: (key) => this.properties[key]
+    }, constructorOrRules, rules)
+  }
+
   /**
    * @ignore
    */
@@ -320,6 +357,24 @@ class UnboundRelationship<T extends NumberOrInteger = Integer, P extends Propert
     )
   }
 
+  /**
+   * Hydrates an object of a given type with the properties of the relationship
+   *
+   * @param {GenericConstructor<T> | Rules} constructorOrRules Contructor for the desired type or {@link Rules} for the hydration
+   * @param {Rules} [rules] {@link Rules} for the hydration
+   * @returns {T}
+   *
+   * @experimental Part of the Record Object Mapping preview feature
+   */
+  as <T extends {} = Object>(rules: Rules): T
+  as <T extends {} = Object>(genericConstructor: GenericConstructor<T>): T
+  as <T extends {} = Object>(genericConstructor: GenericConstructor<T>, rules?: Rules): T
+  as <T extends {} = Object>(constructorOrRules: GenericConstructor<T> | Rules, rules?: Rules): T {
+    return as({
+      get: (key) => this.properties[key]
+    }, constructorOrRules, rules)
+  }
+
   /**
    * @ignore
    */

packages/core/src/index.ts

@@ -83,7 +83,7 @@ import NotificationFilter, {
   notificationFilterMinimumSeverityLevel,
   NotificationFilterMinimumSeverityLevel
 } from './notification-filter'
-import Result, { QueryResult, ResultObserver } from './result'
+import Result, { MappedQueryResult, QueryResult, ResultObserver } from './result'
 import EagerResult from './result-eager'
 import ConnectionProvider, { Releasable } from './connection-provider'
 import Connection from './connection'
@@ -103,6 +103,10 @@ import resultTransformers, { ResultTransformer } from './result-transformers'
 import ClientCertificate, { clientCertificateProviders, ClientCertificateProvider, ClientCertificateProviders, RotatingClientCertificateProvider, resolveCertificateProvider } from './client-certificate'
 import * as internal from './internal' // todo: removed afterwards
 import Vector, { VectorType, vector, isVector } from './vector'
+import { StandardCase } from './mapping.nameconventions'
+import { Rule, Rules, RecordObjectMapping } from './mapping.highlevel'
+import { rule } from './mapping.rulesfactories'
+import mappingDecorators from './mapping.decorators'
 import UnsupportedType, { isUnsupportedType } from './unsupported-type'
 
 /**
@@ -191,6 +195,10 @@ const forExport = {
   notificationFilterMinimumSeverityLevel,
   clientCertificateProviders,
   resolveCertificateProvider,
+  rule,
+  mappingDecorators,
+  RecordObjectMapping,
+  StandardCase,
   UnsupportedType,
   isUnsupportedType,
   isVector,
@@ -275,16 +283,21 @@ export {
   resolveCertificateProvider,
   isVector,
   Vector,
+  vector,
+  rule,
+  mappingDecorators,
+  RecordObjectMapping,
+  StandardCase,
   UnsupportedType,
   isUnsupportedType,
-  vector
 }
 
 export type {
   StandardDate,
   NumberOrInteger,
   NotificationPosition,
   QueryResult,
+  MappedQueryResult,
   ResultObserver,
   TransactionConfig,
   BookmarkManager,
@@ -309,7 +322,9 @@ export type {
   ClientCertificateProvider,
   ClientCertificateProviders,
   RotatingClientCertificateProvider,
-  VectorType
+  VectorType,
+  Rule,
+  Rules
 }
 
 export default forExport

packages/core/src/internal/observers.ts

@@ -16,6 +16,7 @@
  */
 
 import Record from '../record'
+import { GenericResultObserver } from '../result'
 import ResultSummary from '../result-summary'
 
 interface StreamObserver {
@@ -115,7 +116,7 @@ export interface ResultStreamObserver extends StreamObserver {
    * @param {function(metadata: Object)} observer.onCompleted - Handle stream tail, the summary.
    * @param {function(error: Object)} observer.onError - Handle errors, should always be provided.
    */
-  subscribe: (observer: ResultObserver) => void
+  subscribe: (observer: GenericResultObserver<any>) => void
 }
 
 export class CompletedObserver implements ResultStreamObserver {