From 208e0ed4a4ac8d5cf1f33f9e55b1009731d64b53 Mon Sep 17 00:00:00 2001
From: Henry Zhu <hi@henryzoo.com>
Date: Wed, 12 Oct 2016 22:07:14 -0400
Subject: [PATCH] error when no targets option is passed

---
 experimental/babel-preset-env/src/index.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/experimental/babel-preset-env/src/index.js b/experimental/babel-preset-env/src/index.js
index 4d624645f1..dd66a6ff2b 100644
--- a/experimental/babel-preset-env/src/index.js
+++ b/experimental/babel-preset-env/src/index.js
@@ -117,6 +117,22 @@ export const validateModulesOption = (modulesOpt = "commonjs") => {
 };
 
 export default function buildPreset(context, opts) {
+  if (!opts.targets) {
+    throw new Error(
+`
+babel-preset-env requires a "targets" option:
+{
+  "presets": [
+    ["env", {
+      "targets": {
+        "chrome": 50
+      }
+    }]
+  ]
+}
+`);
+  }
+
   const loose = validateLooseOption(opts.loose);
   const moduleType = validateModulesOption(opts.modules);
   const targets = getTargets(opts.targets);