#2106 cdp: honor skipInteraction flag in build's purge prompt

lib/index.js

@@ -1274,13 +1274,16 @@ export default class Mcdev {
             return;
         }
 
-        if (typeof Util.OPTIONS.purge !== 'boolean') {
+        if (typeof Util.OPTIONS.purge !== 'boolean' && !Util.OPTIONS.skipInteraction) {
             // deploy folder is in targets for definition creation
             // recommend to purge their content first
             Util.OPTIONS.purge = await confirm({
                 message: `Do you want to empty relevant BU sub-folders in /${properties.directories.deploy} (ensures no files from previous deployments remain)?`,
                 default: true,
             });
+        } else if (Util.OPTIONS.skipInteraction) {
+            // with --y/--yes, go with the default (purge = true)
+            Util.OPTIONS.purge = true;
         }
 
         const response = bulk

test/general.test.js

@@ -1,11 +1,11 @@
 import * as chai from 'chai';
+import { Util } from '../lib/util/util.js';
 const assert = chai.assert;
 const expect = chai.expect;
 
 import chaiFiles from 'chai-files';
 import * as testUtils from './utils.js';
 import handler from '../lib/index.js';
-import { Util } from '../lib/util/util.js';
 import MetadataType from '../lib/metadataTypes/MetadataType.js';
 import Asset from '../lib/metadataTypes/Asset.js';
 import File from '../lib/util/file.js';
@@ -1304,6 +1304,41 @@ describe('GENERAL', () => {
                 );
             });
 
+            it('build does not prompt for purge when skipInteraction is set', async () => {
+                // preparation
+                await handler.retrieve('testInstance/testBU', ['automation']);
+                const argvMetadata = ['automation:testExisting_automation'];
+                const typeKeyCombo = handler.metadataToTypeKey(argvMetadata);
+                const buName = 'testInstance/testBU';
+
+                // simulate --y / --yes
+                handler.setOptions({ skipInteraction: true });
+
+                // buildTemplate first, then build; if the confirm prompt fires
+                // here the test hangs (no TTY), proving the bug; with the fix
+                // it should complete and set purge to the default (true)
+                await handler.buildTemplate(buName, typeKeyCombo, undefined, ['testSourceMarket']);
+                await handler.build(
+                    buName,
+                    undefined,
+                    typeKeyCombo,
+                    ['testSourceMarket'],
+                    ['deployment-target'],
+                    true
+                );
+
+                assert.equal(process.exitCode, 0, 'build should not have thrown');
+                assert.strictEqual(
+                    Util.OPTIONS.purge,
+                    true,
+                    'purge should default to true when skipInteraction is set'
+                );
+
+                // cleanup
+                handler.setOptions({ skipInteraction: undefined });
+                Util.OPTIONS.purge = undefined;
+            });
+
             it('buildTemplate + buildDefinition for multiple types with keys and --dependencies and --retrieve', async () => {
                 // preparation
                 const argvMetadata = [