fix(@angular/cli): Fix filtering files on completion

Fix angular#4664
Close angular#4972

Author: comewalk

packages/@angular/cli/commands/completion.ts

@@ -78,7 +78,7 @@ const CompletionCommand = Command.extend({
     commandOptions.all = !commandOptions.bash && !commandOptions.zsh;
 
     const commandFiles = fs.readdirSync(__dirname)
-      .filter(file => file.match(/\.ts$/) && !file.match(/\.run.ts$/))
+      .filter(file => file.match(/\.(j|t)s$/) && !file.match(/\.d.ts$/))
       .map(file => path.parse(file).name)
       .filter(file => {
         return commandsToIgnore.indexOf(file) < 0;

tests/e2e/tests/commands/completion/completion.ts

@@ -0,0 +1,9 @@
+import {silentNg} from '../../../utils/process';
+
+
+export default function() {
+  return Promise.resolve()
+    .then(() => silentNg('completion'))
+    .then(() => process.chdir('/'))
+    .then(() => silentNg('completion'));
+}