refactor(ngcc): add debug messages to help with debugging in parallel mode (#34437)

PR Close #34437

packages/compiler-cli/ngcc/src/execution/cluster/executor.ts

@@ -39,7 +39,7 @@ export class ClusterExecutor implements Executor {
       return master.run();
     } else {
       // This process is a cluster worker.
-      const worker = new ClusterWorker(createCompileFn);
+      const worker = new ClusterWorker(this.logger, createCompileFn);
       return worker.run();
     }
   }

packages/compiler-cli/ngcc/src/execution/cluster/worker.ts

@@ -10,7 +10,9 @@
 
 import * as cluster from 'cluster';
 
+import {Logger} from '../../logging/logger';
 import {CompileFn, CreateCompileFn} from '../api';
+import {stringifyTask} from '../utils';
 
 import {MessageToWorker} from './api';
 import {sendMessageToMaster} from './utils';
@@ -23,7 +25,7 @@ import {sendMessageToMaster} from './utils';
 export class ClusterWorker {
   private compile: CompileFn;
 
-  constructor(createCompileFn: CreateCompileFn) {
+  constructor(private logger: Logger, createCompileFn: CreateCompileFn) {
     if (cluster.isMaster) {
       throw new Error('Tried to instantiate `ClusterWorker` on the master process.');
     }
@@ -38,10 +40,12 @@ export class ClusterWorker {
       try {
         switch (msg.type) {
           case 'process-task':
+            this.logger.debug(
+                `[Worker #${cluster.worker.id}] Processing task: ${stringifyTask(msg.task)}`);
             return this.compile(msg.task);
           default:
             throw new Error(
-                `Invalid message received on worker #${cluster.worker.id}: ${JSON.stringify(msg)}`);
+                `[Worker #${cluster.worker.id}] Invalid message received: ${JSON.stringify(msg)}`);
         }
       } catch (err) {
         sendMessageToMaster({

packages/compiler-cli/ngcc/src/main.ts

@@ -274,6 +274,8 @@ export function mainNgcc(
             `Failed to compile entry-point ${entryPoint.name} due to compilation errors:\n${errors}`);
       }
 
+      logger.debug(`  Successfully compiled ${entryPoint.name} : ${formatProperty}`);
+
       onTaskCompleted(task, TaskProcessingOutcome.Processed);
     };
   };