feat: support for cds.Map

CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 ### Added
+- Added support for new builtin type `cds.Map`
 - Added types for `SELECT.hints()` of `cds.ql` API
 
 ### Changed

apis/csn.d.ts

@@ -70,7 +70,7 @@ export interface type extends any_ {
          'cds.UUID' | 'cds.String' | 'cds.LargeString' | 'cds.Binary' | 'cds.LargeBinary' | 'cds.Vector' |
          'cds.Integer' | 'cds.UInt8' | 'cds.Int16' | 'cds.Int32' | 'cds.Int64' | 'cds.Double' | 'cds.Decimal' |
          'cds.Date' | 'cds.Time' | 'cds.DateTime' | 'cds.Timestamp' |
-         'cds.Association' | 'cds.Composition' |
+         'cds.Association' | 'cds.Composition' | 'cds.Map' |
          FQN & Record<never,never> // allow any other CDS type as well (e.g. 'User')
   items?: type
 }
@@ -85,6 +85,10 @@ export interface struct extends type {
   elements: { [name: string]: Element }
 }
 
+export interface Map extends Omit<struct, 'includes' | 'items'> {
+  elements: Record<string,never>
+}
+
 export interface entity extends Omit<struct, 'elements'> {
 
   /**

apis/linked/classes.d.ts

@@ -105,6 +105,12 @@ declare class struct<K extends kinds = 'elements' | 'type'> extends type<K> impl
   elements: Definitions<type<'type'>>
 }
 
+/**
+ * @since 8.6.0
+ */
+declare interface Map extends csn.Map {}
+declare class Map {}
+
 // clashes with services.context when exported from facade
 declare interface context_ extends csn.context {}
 declare class context_ extends any_ { }

test/typescript/apis/project/cds-linked.ts

@@ -3,7 +3,7 @@ import cds from '@sap/cds';
 import { csn } from '../../../..';
 import { as } from './dummy';
 
-const { action, aspect, entity, event, mixin, scalar, struct, type, Decimal, String } = cds.linked.classes
+const { action, aspect, entity, event, mixin, scalar, struct, type, Decimal, String, Map } = cds.linked.classes
 
 // is exported from top level
 as<LinkedCSN>() === as<cds.linked.LinkedCSN>()
@@ -91,6 +91,12 @@ new Decimal().scale
 
 new String().length
 
+const never: never = new Map().elements.xyz
+new Map().elements
+// @ts-expect-error
+new Map().items
+
+
 mixin(class {}, class {})
 // @ts-expect-error
 mixin(42)