From e4f67d8a2f627e8b52d5e54bc9b271b03ef6b662 Mon Sep 17 00:00:00 2001
From: Simon Lydell <simon.lydell@gmail.com>
Date: Sat, 21 Jan 2017 18:11:34 +0100
Subject: [PATCH] Exit with an error if an unknown CLI option is passed (#365)

* Exit with an error if an unknown CLI option is passed

* Only warn for unknown CLI options
---
 bin/prettier.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/bin/prettier.js b/bin/prettier.js
index 4f2fb0c1..54f0c720 100755
--- a/bin/prettier.js
+++ b/bin/prettier.js
@@ -19,7 +19,12 @@ const argv = minimist(process.argv.slice(2), {
     "flow-parser"
   ],
   string: [ "parser" ],
-  default: { "bracket-spacing": true, parser: "babylon" }
+  default: { "bracket-spacing": true, parser: "babylon" },
+  unknown: param => {
+    if (param.startsWith("-")) {
+      console.warn("Ignored unknown option: " + param + "\n");
+    }
+  }
 });
 
 if (argv["version"]) {