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Return meaningful error when no devices available 

Summary:
`react-native run-ios --device` should report 'No iOS devices connected.' in case when no devices attached. However due to logic bug when empty array is being treatened as a boolean value, cli reports odd message, saying `Could not find device with the name: "true".`

Disconnect all iOS devices from developer machine and run `react-native run-ios --device` in any project - console message should state that there are no devices available.
Closes https://github.com/facebook/react-native/pull/15603

Differential Revision: D5686891

Pulled By: shergin

fbshipit-source-id: 289461b6f920691ad39e940ecca6d85cf2a3573b
This commit is contained in:
Vladimir Kotikov 2017-08-22 23:33:21 -07:00 committed by Facebook Github Bot
parent 743dc20aac
commit ad4aee7519
1 changed files with 6 additions and 6 deletions
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4
local-cli/runIOS/runIOS.js
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@ -50,7 +50,7 @@ function runIOS(argv, config, args) {
if (selectedDevice) {
return runOnDevice(selectedDevice, scheme, xcodeProject, args.configuration, args.packager);
} else {
if (devices){
if (devices && devices.length > 0) {
console.log('Could not find device with the name: "' + args.device + '".');
console.log('Choose one of the following:');
printFoundDevices(devices);
@ -70,7 +70,7 @@ function runOnDeviceByUdid(args, scheme, xcodeProject, devices) {
if (selectedDevice) {
return runOnDevice(selectedDevice, scheme, xcodeProject, args.configuration, args.packager);
} else {
if (devices){
if (devices && devices.length > 0) {
console.log('Could not find device with the udid: "' + args.udid + '".');
console.log('Choose one of the following:');
printFoundDevices(devices);