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On windows:
rmdir /s /q ComposerSetup
rmdir /s /q C:\Users\<username>\AppData\Roaming\Composer
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Syntax: composer remove <package>
Example: composer remove laravel/tinker
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Delete the file composer.phar.
Delete the Cache Folder:
Linux: /home/<user>/.composer
Windows: C:\Users\<username>\AppData\Roaming\Composer