From 20331303b0a8f5002094246ce7101f207d254ed9 Mon Sep 17 00:00:00 2001
From: fatme <hfatme@gmail.com>
Date: Wed, 24 Oct 2018 14:18:13 +0300
Subject: [PATCH] fix: validate params passed to preview command

---
 lib/commands/preview.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/commands/preview.ts b/lib/commands/preview.ts
index 45d6639ff8..1926fcf8bf 100644
--- a/lib/commands/preview.ts
+++ b/lib/commands/preview.ts
@@ -3,6 +3,7 @@ export class PreviewCommand implements ICommand {
 	private static MIN_SUPPORTED_WEBPACK_VERSION = "0.17.0";
 
 	constructor(private $bundleValidatorHelper: IBundleValidatorHelper,
+		private $errors: IErrors,
 		private $liveSyncService: ILiveSyncService,
 		private $networkConnectivityValidator: INetworkConnectivityValidator,
 		private $projectData: IProjectData,
@@ -27,6 +28,10 @@ export class PreviewCommand implements ICommand {
 	}
 
 	public async canExecute(args: string[]): Promise<boolean> {
+		if (args && args.length) {
+			this.$errors.fail(`The arguments '${args.join(" ")}' are not valid for the preview command.`);
+		}
+
 		await this.$networkConnectivityValidator.validate();
 		this.$bundleValidatorHelper.validate(PreviewCommand.MIN_SUPPORTED_WEBPACK_VERSION);
 		return true;