feat(@angular-devkit/core): add handling for defaultConfiguration target definition property

Author: alan-agius4

etc/api/angular_devkit/core/src/_golden-api.d.ts

@@ -978,6 +978,7 @@ export declare class SynchronousDelegateExpectedException extends BaseException
 export interface TargetDefinition {
     builder: string;
     configurations?: Record<string, Record<string, JsonValue | undefined> | undefined>;
+    defaultConfiguration?: string;
     options?: Record<string, JsonValue | undefined>;
 }
 

packages/angular_devkit/core/src/workspace/definitions.ts

@@ -25,7 +25,7 @@ export interface ProjectDefinition {
 export interface TargetDefinition {
   options?: Record<string, JsonValue | undefined>;
   configurations?: Record<string, Record<string, JsonValue | undefined> | undefined>;
-
+  defaultConfiguration?: string;
   builder: string;
 }
 
@@ -234,6 +234,7 @@ export class TargetDefinitionCollection extends DefinitionCollection<TargetDefin
       builder: definition.builder,
       options: definition.options,
       configurations: definition.configurations,
+      defaultConfiguration: definition.defaultConfiguration,
     };
 
     super.set(definition.name, target);

packages/angular_devkit/core/src/workspace/json/reader.ts

@@ -294,7 +294,7 @@ function parseTargetsObject(
     const name = key.value;
     if (context.trackChanges) {
       targets[name] = createVirtualAstObject<TargetDefinition>(value, {
-        include: [ 'builder', 'options', 'configurations' ],
+        include: [ 'builder', 'options', 'configurations', 'defaultConfiguration' ],
         listener(op, path, node, value) {
           jsonMetadata.addChange(
             op,

packages/angular_devkit/core/src/workspace/json/writer.ts

@@ -104,6 +104,9 @@ function convertJsonTarget(target: TargetDefinition): JsonObject {
     ...(isEmpty(target.configurations)
       ? {}
       : { configurations: target.configurations as JsonObject }),
+    ...(target.defaultConfiguration === undefined
+      ? {}
+      : { defaultConfiguration: target.defaultConfiguration }),
   };
 }