feat(bazel): Eject Bazel (#29167)

Add command line flag to expose Bazel files on disk.

`ng build --leaveBazelFilesOnDisk`

PR Close #29167

packages/bazel/src/builders/index.ts

@@ -20,7 +20,7 @@ class BazelBuilder implements Builder<Schema> {
   run(config: BuilderConfiguration<Partial<Schema>>): Observable<BuildEvent> {
     const {host, logger, workspace} = this.context;
     const root: Path = workspace.root;
-    const {bazelCommand, targetLabel, watch} = config.options as Schema;
+    const {bazelCommand, leaveBazelFilesOnDisk, targetLabel, watch} = config.options as Schema;
     const executable = watch ? 'ibazel' : 'bazel';
     const binary = checkInstallation(executable, root) as Path;
 
@@ -35,8 +35,10 @@ class BazelBuilder implements Builder<Schema> {
         logger.error(err.message);
         return {success: false};
       } finally {
+        if (!leaveBazelFilesOnDisk) {
           await deleteBazelFiles(host, bazelFiles);  // this will never throw
         }
+      }
     }));
   }
 }

packages/bazel/src/builders/schema.d.ts

@@ -9,14 +9,27 @@
  * Options for Bazel Builder
  */
 export interface Schema {
+  /**
+   * Common commands supported by Bazel.
+   */
   bazelCommand: BazelCommand;
+  /**
+   * If true, leave Bazel files on disk after running command.
+   */
+  leaveBazelFilesOnDisk?: boolean;
   /**
    * Target to be executed under Bazel.
    */
   targetLabel: string;
+  /**
+   * If true, watch the filesystem using ibazel.
+   */
   watch?: boolean;
 }
 
+/**
+ * Common commands supported by Bazel.
+ */
 export enum BazelCommand {
   Build = 'build',
   Run = 'run',

packages/bazel/src/builders/schema.json

@@ -10,6 +10,7 @@
     },
     "bazelCommand": {
       "type": "string",
+      "description": "Common commands supported by Bazel.",
       "enum": [
         "run",
         "build",
@@ -18,6 +19,12 @@
     },
     "watch": {
       "type": "boolean",
+      "description": "If true, watch the filesystem using ibazel.",
+      "default": false
+    },
+    "leaveBazelFilesOnDisk": {
+      "type": "boolean",
+      "description": "If true, leave Bazel files on disk after running command.",
       "default": false
     }
   },