From 12151d81d650d3043826a8e0706c3720f3625d7b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Chopin?= <seb@chopin.io>
Date: Fri, 2 Nov 2018 18:07:39 +0900
Subject: [PATCH] feat: add --modern to nuxt start (#4254)

---
 packages/babel-preset-app/src/index.js |  2 +-
 packages/cli/src/commands/start.js     | 13 ++++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/packages/babel-preset-app/src/index.js b/packages/babel-preset-app/src/index.js
index db9673d723..f687cf60d0 100644
--- a/packages/babel-preset-app/src/index.js
+++ b/packages/babel-preset-app/src/index.js
@@ -39,7 +39,7 @@ module.exports = (context, options = {}) => {
   const {
     buildTarget,
     loose = false,
-    useBuiltIns = 'usage',
+    useBuiltIns = (modern ? false : 'usage'),
     modules = false,
     polyfills: userPolyfills,
     ignoreBrowserslistConfig = modern,
diff --git a/packages/cli/src/commands/start.js b/packages/cli/src/commands/start.js
index 506f0fe47f..2423bf5bb1 100644
--- a/packages/cli/src/commands/start.js
+++ b/packages/cli/src/commands/start.js
@@ -9,7 +9,18 @@ export default {
   usage: 'start <dir>',
   options: {
     ...common,
-    ...server
+    ...server,
+    modern: {
+      alias: 'm',
+      type: 'boolean',
+      description: 'Build app for modern browsers',
+      prepare(cmd, options, argv) {
+        options.build = options.build || {}
+        if (argv.modern) {
+          options.build.modern = !!argv.modern
+        }
+      }
+    }
   },
   async run(cmd) {
     const argv = cmd.getArgv()