IONIC : A utility CLI has unexpectedly closed

Question

I got this error when i run ionic serve The Ionic CLI will exit. Please check any output above for error details.

my ionic info

$ionic info
Ionic:

   ionic (Ionic CLI)  : 4.0.1 (C:\Users\Pc\AppData\Roaming\npm\node_modules\ionic)
   Ionic Framework    : ionic-angular 3.9.2
   @ionic/app-scripts : 3.1.8

Cordova:

   cordova (Cordova CLI) : 8.0.0
   Cordova Platforms     : android 7.0.0

System:

   Android SDK Tools : 25.3.1
   NodeJS            : v6.10.1 (C:\Program Files\nodejs\node.exe)
   npm               : 5.3.0
   OS                : Windows 10

Environment:

   ANDROID_HOME : C:\Users\Pc\AppData\Local\Android\sdk

Answer 1

Run the below command, being in root directory of Ionic project:

npm install @ionic/app-scripts@latest --save-dev

Then you can try Ionic serve or Ionic s.

Answer 2

Try running:

npm install @ionic/lab

Answer 3

You must kill the NodeJs service I believe it's a bug

Answer 4

Try replacing the package.json scripts parts. Worked for me.

  "scripts": {
    "build": "ionic build",
    "serve": "ionic build",
    "start": "npm run serve"
  },

Answer 5

I had a similar issue:

Assertion `args[1]->IsString()' failed.

A utility CLI has unexpectedly closed

I fixed that by installing natives lib through npm:

npm i natives

Answer 6

I had a similar issue. I tried several different solutions, and for some reason different ones worked on different machines. Because I'm an illogical masochist, I attempted to fix this issue in the same project on 3 different laptops instead of sending the new fixed version to the other laptops.

The best answer I came up with is to:

• Delete node_modules
• copy node_modules from a different project (I used an earlier version of my app)
• run npm i to install any missing modules

I think this approach should work for almost all instances.

Answer 7

Simpy run

npm install @ionic/app-scripts@latest --save-dev

and then

ionic serve

This error is because of some audit during installing a plugin or adding a plug in

Answer 8

Maybe there is an issue in your hosts file. Make sure your ::1 should enable or not commented.

Example:

Answer 9

I don't know why but using sudo was the only way to solve this on my ubuntu machine! I just needed to run the command using sudo:

sudo ionic serve

Answer 10

if you get this in the log:

The target entry-point "@ionic-native/media-capture" has missing dependencies:

• @ionic-native/core

try this,

npm install --save @ionic-native/core

Answer 11

My solution: Upgrade Angular. It'll reveal the real reason for unexpectedly closing in a more verbouse error message. Mine was incompatible dependencies. I simply edited package.json with the right depencies, and ran npm update

Answer 12

For any Linux Users: This error might occur if you installed node.js via the snapstore. Either change PATH to /usr/local/bin/node or use npm to update/install node.js again at the right place.