From 1115bec3c3d7fe0936d20bf9b7d8edefde66a019 Mon Sep 17 00:00:00 2001
From: Henry Zhu <hi@henryzoo.com>
Date: Wed, 16 Nov 2016 12:27:39 -0500
Subject: [PATCH] Only console.log the debug info once (#46)

---
 experimental/babel-preset-env/src/index.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/experimental/babel-preset-env/src/index.js b/experimental/babel-preset-env/src/index.js
index 304dcd9017..bbeefdc7af 100644
--- a/experimental/babel-preset-env/src/index.js
+++ b/experimental/babel-preset-env/src/index.js
@@ -132,6 +132,8 @@ export const validateWhitelistOption = (whitelistOpt = []) => {
   return whitelistOpt;
 };
 
+let hasBeenLogged = false;
+
 export default function buildPreset(context, opts = {}) {
   const loose = validateLooseOption(opts.loose);
   const moduleType = validateModulesOption(opts.modules);
@@ -142,7 +144,10 @@ export default function buildPreset(context, opts = {}) {
   let transformations = Object.keys(pluginList)
     .filter((pluginName) => isPluginRequired(targets, pluginList[pluginName]));
 
-  if (debug) {
+  if (debug && !hasBeenLogged) {
+    hasBeenLogged = true;
+
+    console.log("babel-preset-env: `DEBUG` option");
     console.log("");
     console.log(`Using targets: ${JSON.stringify(targets, null, 2)}`);
     console.log("");