feat(@angular/cli): integrate file formatting into update migrations

This adds formatting to `ng update`

Author: alan-agius4

packages/angular/cli/src/command-builder/schematics-command-module.ts

@@ -20,6 +20,7 @@ import { EventCustomDimension } from '../analytics/analytics-parameters';
 import { getProjectByCwd, getSchematicDefaults } from '../utilities/config';
 import { assertIsError } from '../utilities/error';
 import { memoize } from '../utilities/memoize';
+import { formatFiles } from '../utilities/prettier';
 import { isTTY } from '../utilities/tty';
 import {
   CommandModule,
@@ -29,7 +30,6 @@ import {
   OtherOptions,
 } from './command-module';
 import { Option, parseJsonSchemaToOptions } from './utilities/json-schema';
-import { formatFiles } from './utilities/prettier';
 import { SchematicEngineHost } from './utilities/schematic-engine-host';
 import { subscribeToWorkflow } from './utilities/schematic-workflow';
 

packages/angular/cli/src/commands/update/utilities/migration.ts

@@ -19,6 +19,7 @@ import { subscribeToWorkflow } from '../../../command-builder/utilities/schemati
 import { colors, figures } from '../../../utilities/color';
 import { assertIsError } from '../../../utilities/error';
 import { writeErrorToLogFile } from '../../../utilities/log-file';
+import { formatFiles } from '../../../utilities/prettier';
 import { askChoices } from '../../../utilities/prompt';
 import { isTTY } from '../../../utilities/tty';
 import { coerceVersionNumber } from './cli-version';
@@ -230,6 +231,18 @@ async function executePackageMigrations(
         break;
     }
 
+    if (files.size) {
+      try {
+        await formatFiles(process.cwd(), files);
+      } catch (error) {
+        assertIsError(error);
+
+        logger.warn(
+          `WARNING: Formatting of files failed with the following error: ${error.message}`,
+        );
+      }
+    }
+
     logger.info(`  Migration completed (${modifiedFilesText}).`);
 
     // Commit migration