Use of undefined constant issue

It’s possible that your $http_host isn’t in the list of possible choices. You can always check first that the ENVIRONMENT constant has actually been defined:

if ( defined( 'ENVIRONMENT' ) && 'local' === ENVIRONMENT ) { 
     define('ASSETSDIR', get_template_directory_uri() . '/assets');
} else {
    define('ASSETSDIR', $dist_dir . '/assets');
}

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