WordPress at a glance
function is not described

is_uninstallable_plugin() WP 2.7.0

Whether the plugin can be uninstalled.

No Hooks.

Return

true/false. Whether plugin can be uninstalled.

Usage

is_uninstallable_plugin( $plugin );
$plugin(string) (required)
Path to the main plugin file from plugins directory.

Code of is uninstallable plugin: wp-admin/includes/plugin.php VER 5.0.3

<?php
function is_uninstallable_plugin($plugin) {
	$file = plugin_basename($plugin);

	$uninstallable_plugins = (array) get_option('uninstall_plugins');
	if ( isset( $uninstallable_plugins[$file] ) || file_exists( WP_PLUGIN_DIR . '/' . dirname($file) . '/uninstall.php' ) )
		return true;

	return false;
}