‘ionic serve’ is failing without an error

After resetting git head one commit back and confirming ionic updates, ionic serve is exiting on 'build dev started...' with NO error :/

I have tried removing package.lock.json and node_modules folder from project end installing again with npm update - problem not solved

Then I have found out that on the other ionic project, ionic is not working too, with same problem.

ionic serve
[WARN] No local CLI detected.
       Starting with CLI 3.6, the CLI must be installed locally to use local CLI plugins.

? Install now? Yes

> npm install --save-dev --save-exact ionic@latest
✔ Running command - done!
[OK] Installed Ionic CLI locally!

Please re-run your command.
ctibor:client lucky$ ionic serve
? Local plugin @ionic/cli-plugin-cordova has an update available (1.4.1 => 1.6.2)! Would you like to install it? Yes
> npm install --save-dev --save-exact @ionic/cli-plugin-cordova@latest
✔ Running command - done!
[OK] Updated @ionic/cli-plugin-cordova to 1.6.2! 🎉
? Local plugin @ionic/cli-plugin-ionic-angular has an update available (1.3.2 => 1.4.1)! Would you like to install it? Yes
> npm install --save-dev --save-exact @ionic/cli-plugin-ionic-angular@latest
✔ Running command - done!
[OK] Updated @ionic/cli-plugin-ionic-angular to 1.4.1! 🎉
> npm dedupe
✔ Running command - done!

ionic serve

[INFO] Starting app-scripts server: --port 8100 --p 8100 --livereload-port 35729 --r 35729 --address localhost - Ctrl+C
       to cancel
[06:34:13]  watch started ... 
[06:34:13]  build dev started ... 
user:folder username$

ionic info

cli packages: (/Users/lucky/Documents/projects/bubuc/client/node_modules)

@ionic/cli-plugin-cordova       : 1.6.2
@ionic/cli-plugin-ionic-angular : 1.4.1
@ionic/cli-utils                : 1.7.0
ionic (Ionic CLI)               : 3.7.0

global packages:

Cordova CLI : 7.0.1

local packages:

@ionic/app-scripts : 1.3.7
Cordova Platforms  : android 6.2.3
Ionic Framework    : ionic-angular 3.6.0

System:

Node       : v6.9.5
OS         : macOS Sierra
Xcode      : Xcode 8.3.3 Build version 8E3004b 
ios-deploy : 1.9.1 
ios-sim    : 5.0.13 
npm        : 5.3.0

Solution

Restarting whole machine fixed this issue!

EDIT (14.aug.2017): I have found out that this is just collision of two 'ionic serve' processes. Since now it was no problem to have multiple instances of ionic serve, for example when I had two projects opened at same time. This issue raised after Starting with CLI 3.6, the CLI must be installed locally to use local CLI plugins. update. So from now, cancelling the other process is enough to fix the issue.