Error when using composer require-dev.mikey179/vfsStream is invalid

user_544542 0
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I am using Amazon LightSail and the CodeIgniter framework. Trying to install PhpSpreadsheet - https://phpspreadsheet.readthedocs.io/en/latest/#installation using

composer require phpoffice/phpspreadsheet

However I then am greeted with

 [RuntimeException]
  require-dev.mikey179/vfsStream is invalid, it should not contain uppercase characters. Please use mikey179/vfsstream instead.

I did the usual Googling but couldn't find anything specific.

When I run

composer.phar show

I get the error from above.

composer-php codeigniter-3 amazon-lightsail codeigniter
4 Answers

You must have mikey179/vfsStream in your composer.json in require-dev section (as the problem is for require-dev and you are trying to do normal require).

Simply change the name of package to all lowercase characters.

user_5497280

Just replace mikey179/vfsStream with mikey179/vfsstream

user_42595440

Make this "mikey179/vfsStream" package name to lowercase.

"mikey179/vfsStream" replace this to "mikey179/vfsstream"

user_53115380

In your composer.json file look for mikey179/vfsStream and lowercase all its characters and make it mikey179/vfsstream

"require-dev": {
    "mikey179/vfsstream": "1.1.*",
    "phpunit/phpunit": "4.* || 5.*"
}
user_155383550
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