feat(@angular-devkit/architect): support accessing project metadata

etc/api/angular_devkit/architect/src/index.d.ts

@@ -15,6 +15,8 @@ export interface BuilderContext {
     workspaceRoot: string;
     addTeardown(teardown: () => (Promise<void> | void)): void;
     getBuilderNameForTarget(target: Target): Promise<string>;
+    getProjectMetadata(target: Target): Promise<json.JsonObject>;
+    getProjectMetadata(projectName: string): Promise<json.JsonObject>;
     getTargetOptions(target: Target): Promise<json.JsonObject>;
     reportProgress(current: number, total?: number, status?: string): void;
     reportRunning(): void;

etc/api/angular_devkit/architect/testing/index.d.ts

@@ -8,6 +8,7 @@ export declare class TestingArchitectHost implements ArchitectHost {
     getBuilderNameForTarget(target: Target): Promise<string | null>;
     getCurrentDirectory(): Promise<string>;
     getOptionsForTarget(target: Target): Promise<json.JsonObject | null>;
+    getProjectMetadata(target: Target | string): Promise<json.JsonObject | null>;
     getWorkspaceRoot(): Promise<string>;
     loadBuilder(info: BuilderInfo): Promise<Builder | null>;
     resolveBuilder(builderName: string): Promise<BuilderInfo | null>;

packages/angular_devkit/architect/node/node-modules-architect-host.ts

@@ -113,6 +113,29 @@ export class WorkspaceNodeModulesArchitectHost implements ArchitectHost<NodeModu
     };
   }
 
+  async getProjectMetadata(target: Target | string): Promise<json.JsonObject | null> {
+    const projectName = typeof target === 'string' ? target : target.project;
+
+    // NOTE: Remove conditional when deprecated support for experimental workspace API is removed.
+    if ('getProject' in this._workspace) {
+      return this._workspace.getProject(projectName) as unknown as json.JsonObject;
+    } else {
+      const projectDefinition = this._workspace.projects.get(projectName);
+      if (!projectDefinition) {
+        throw new Error('Project does not exist.');
+      }
+
+      const metadata = {
+        root: projectDefinition.root,
+        sourceRoot: projectDefinition.sourceRoot,
+        prefix: projectDefinition.prefix,
+        ...projectDefinition.extensions,
+      } as unknown as json.JsonObject;
+
+      return metadata;
+    }
+  }
+
   async loadBuilder(info: NodeModulesBuilderInfo): Promise<Builder> {
     const builder = (await import(info.import)).default;
     if (builder[BuilderSymbol]) {

packages/angular_devkit/architect/src/api.ts

@@ -197,6 +197,9 @@ export interface BuilderContext {
    */
   getTargetOptions(target: Target): Promise<json.JsonObject>;
 
+  getProjectMetadata(projectName: string): Promise<json.JsonObject>;
+  getProjectMetadata(target: Target): Promise<json.JsonObject>;
+
   /**
    * Resolves and return a builder name. The exact format of the name is up to the host,
    * so it should not be parsed to gather information (it's free form). This string can be

packages/angular_devkit/architect/src/architect.ts

@@ -277,6 +277,30 @@ function _getTargetOptionsFactory(host: ArchitectHost) {
   );
 }
 
+function _getProjectMetadataFactory(host: ArchitectHost) {
+  return experimental.jobs.createJobHandler<Target, json.JsonValue, json.JsonObject>(
+    target => {
+      return host.getProjectMetadata(target).then(options => {
+        if (options === null) {
+          throw new Error(`Invalid target: ${JSON.stringify(target)}.`);
+        }
+
+        return options;
+      });
+    },
+    {
+      name: '..getProjectMetadata',
+      output: { type: 'object' },
+      argument: {
+        oneOf: [
+          { type: 'string' },
+          inputSchema.properties.target,
+        ],
+      },
+    },
+  );
+}
+
 function _getBuilderNameForTargetFactory(host: ArchitectHost) {
   return experimental.jobs.createJobHandler<Target, never, string>(async target => {
     const builderName = await host.getBuilderNameForTarget(target);
@@ -342,6 +366,7 @@ export class Architect {
     privateArchitectJobRegistry.register(_getTargetOptionsFactory(_host));
     privateArchitectJobRegistry.register(_getBuilderNameForTargetFactory(_host));
     privateArchitectJobRegistry.register(_validateOptionsFactory(_host, registry));
+    privateArchitectJobRegistry.register(_getProjectMetadataFactory(_host));
 
     const jobRegistry = new experimental.jobs.FallbackRegistry([
       new ArchitectTargetJobRegistry(_host, registry, this._jobCache, this._infoCache),

packages/angular_devkit/architect/src/create-builder.ts

@@ -25,6 +25,7 @@ import { Builder, BuilderSymbol, BuilderVersionSymbol } from './internal';
 import { scheduleByName, scheduleByTarget } from './schedule-by-name';
 
 
+// tslint:disable-next-line: no-big-function
 export function createBuilder<
   OptT extends json.JsonObject,
   OutT extends BuilderOutput = BuilderOutput,
@@ -144,6 +145,10 @@ export function createBuilder<
             return scheduler.schedule<Target, json.JsonValue, json.JsonObject>(
                     '..getTargetOptions', target).output.toPromise();
           },
+          async getProjectMetadata(target: Target | string) {
+            return scheduler.schedule<Target | string, json.JsonValue, json.JsonObject>(
+                    '..getProjectMetadata', target).output.toPromise();
+          },
           async getBuilderNameForTarget(target: Target) {
             return scheduler.schedule<Target, json.JsonValue, string>(
               '..getBuilderNameForTarget',

packages/angular_devkit/architect/src/internal.ts

@@ -78,4 +78,7 @@ export interface ArchitectHost<BuilderInfoT extends BuilderInfo = BuilderInfo> {
   getWorkspaceRoot(): Promise<string>;
 
   getOptionsForTarget(target: Target): Promise<json.JsonObject | null>;
+
+  getProjectMetadata(projectName: string): Promise<json.JsonObject | null>;
+  getProjectMetadata(target: Target): Promise<json.JsonObject | null>;
 }

packages/angular_devkit/architect/testing/testing-architect-host.ts

@@ -104,6 +104,10 @@ export class TestingArchitectHost implements ArchitectHost {
     return maybeTarget.options;
   }
 
+  async getProjectMetadata(target: Target | string): Promise<json.JsonObject | null> {
+    return this._backendHost && this._backendHost.getProjectMetadata(target as string);
+  }
+
   async loadBuilder(info: BuilderInfo): Promise<Builder | null> {
     return this._builderImportMap.get(info.builderName)
         || (this._backendHost && this._backendHost.loadBuilder(info));