fix(@angular/cli): make flag values case insensitive (#5355)

Fixes #5344

Author: Brocco

packages/@angular/cli/blueprints/component/index.ts

@@ -12,6 +12,27 @@ const getFiles = Blueprint.prototype.files;
 const stringUtils = require('ember-cli-string-utils');
 const astUtils = require('../../utilities/ast-utils');
 
+const viewEncapsulationMap: any = {
+  'emulated': 'Emulated',
+  'native': 'Native',
+  'none': 'None'
+};
+
+const changeDetectionMap: any = {
+  'default': 'Default',
+  'onpush': 'OnPush'
+};
+
+function correctCase(options: any) {
+  if (options.viewEncapsulation) {
+    options.viewEncapsulation = viewEncapsulationMap[options.viewEncapsulation.toLowerCase()];
+  }
+
+  if (options.changeDetection) {
+    options.changeDetection = changeDetectionMap[options.changeDetection.toLowerCase()];
+  }
+}
+
 export default Blueprint.extend({
   description: '',
 
@@ -146,6 +167,8 @@ export default Blueprint.extend({
     options.changeDetection = options.changeDetection !== undefined ?
       options.changeDetection : CliConfig.getValue('defaults.component.changeDetection');
 
+    correctCase(options);
+
     return {
       dynamicPath: this.dynamicPath.dir.replace(this.dynamicPath.appRoot, ''),
       flat: options.flat,

tests/e2e/tests/generate/component/component-flag-case.ts

@@ -0,0 +1,15 @@
+import {join} from 'path';
+import {ng} from '../../../utils/process';
+import {expectFileToMatch} from '../../../utils/fs';
+
+
+export default function() {
+  const compDir = join('src', 'app', 'test');
+
+  return Promise.resolve()
+    .then(() => ng('generate', 'component', 'test', '-cd', 'onpush', '-ve', 'emulated'))
+    .then(() => expectFileToMatch(join(compDir, 'test.component.ts'),
+      /changeDetection: ChangeDetectionStrategy.OnPush/))
+    .then(() => expectFileToMatch(join(compDir, 'test.component.ts'),
+      /encapsulation: ViewEncapsulation.Emulated/));
+}