Fixed composer's invalid argument exception

[mmkjony]

Fixing a conflict with the latest composer while installing a new laravel 5.5.0 project.
Solving composer's exeption:
"[InvalidArgumentException]
Script "post-install-cmd" is not defined in this package"

And, added a script to show the installed laravel version.

[antonkomarev]

Great idea about version!

[ghost]

i dont have that error

Generating optimized autoload files
Running composer as root/super user is highly discouraged as packages, plugins and scripts cannot always be trusted
You made a reference to a non-existent script @php -r "file_exists('.env') || copy('.env.example', '.env');"
Running composer as root/super user is highly discouraged as packages, plugins and scripts cannot always be trusted
You made a reference to a non-existent script @php artisan key:generate
Running composer as root/super user is highly discouraged as packages, plugins and scripts cannot always be trusted
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
You made a reference to a non-existent script @php artisan package:discover
Application ready! Build something amazing.

only the env file is not generated
its because the @ sign
any idea what that symbol means for ?

[taylorotwell]

You just need to update your Laravel installer, as noted in release notes.

[gayansanjeewa]

I just got the same Issue. Thanks @taylorotwell for your comment. I forgot to do a composer global update before the laravel new <project-name>. Once I did that, It's all good. Long live L5.5 ;)

[antonkomarev]

@laravelish https://getcomposer.org/doc/articles/scripts.md#executing-php-scripts
Try to update composer to latest version.

[ghost]

@a-komarev thanks for the info, i had installed composer through apt-get which is using the version 1.1.3
i did not know it was using a old version.. time to install it from https://getcomposer.org/installer

[jo2k]

I was getting that exception error until I updated Composer with composer global update. Now I can do laravel new blog and it works without errors, all the way, including setting the application key.

It would be nice if the Laravel installer's message was a bit more specific, especially for us newbies to Laravel and Composer.

[imkane]

This is happening to me with Laravel 6.*. I did "composer global update" too, but that didn't help :(

Edit:
This command:
laravel new myproject
Results in:

[InvalidArgumentException]
  Script "post-install-cmd" is not defined in this package

However this command:
composer create-project --prefer-dist laravel/laravel myproject
WORKS