Set browsers automatically if not an interactive terminal

Author: Timer

Diff for: scripts/build.js

@@ -51,6 +51,8 @@ const useYarn = fs.existsSync(paths.yarnLockFile);
 const WARN_AFTER_BUNDLE_GZIP_SIZE = 512 * 1024;
 const WARN_AFTER_CHUNK_GZIP_SIZE = 1024 * 1024;
 
+const isInteractive = process.stdout.isTTY;
+
 // Warn and crash if required files are missing
 if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
   process.exit(1);
@@ -63,7 +65,7 @@ const writeStatsJson = argv.indexOf('--stats') !== -1;
 // We require that you explictly set browsers and do not fall back to
 // browserslist defaults.
 const { checkBrowsers } = require('react-dev-utils/browsersHelper');
-checkBrowsers(paths.appPath)
+checkBrowsers(paths.appPath, isInteractive)
   .then(() => {
     // First, read the current file sizes in build directory.
     // This lets us display how much they changed later.

Diff for: scripts/start.js

@@ -78,7 +78,7 @@ if (process.env.HOST) {
 // We require that you explictly set browsers and do not fall back to
 // browserslist defaults.
 const { checkBrowsers } = require('react-dev-utils/browsersHelper');
-checkBrowsers(paths.appPath)
+checkBrowsers(paths.appPath, isInteractive)
   .then(() => {
     // We attempt to use the default port but if it is busy, we offer the user to
     // run on a different port. `choosePort()` Promise resolves to the next free port.