Magento2 | Install custom category attribute

installCustomCategoryAttributeExample.php

<?php
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context) {
    $setup->startSetup();

    /** @var \Magento\Eav\Setup\EavSetup $eavSetup */
    $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);

    $entityTypeId = $eavSetup->getEntityTypeId(\Magento\Catalog\Model\Category::ENTITY);
    $attributeSetId = $eavSetup->getDefaultAttributeSetId($entityTypeId);

    /**
     * Add attribute to the eav/attribute
     */
    $eavSetup->addAttribute(
        $entityTypeId,
        'custom_attribute',
        [
            'type' => 'int',
            'backend' => '',
            'frontend' => '',
            'label' => 'Custom Attribute Label',
            'input' => 'select',
            'class' => '',
            'source' => '',
            'global' => \Magento\Catalog\Model\ResourceModel\Eav\Attribute::SCOPE_GLOBAL,
            'visible' => false,
            'required' => false,
            'user_defined' => true,
            'default' => 'none',
            'searchable' => false,
            'filterable' => false,
            'comparable' => false,
            'visible_on_front' => true,
            'unique' => false,
            'apply_to' => 'category'
        ]
    );

    /**
     * Add attribute to the 'General Information' attribute group
     */
    $eavSetup->addAttributeToGroup(
        $entityTypeId,
        $attributeSetId,
        $eavSetup->getAttributeGroupId($entityTypeId, $attributeSetId, 'general-information'),
        'custom_attribute',
        null
    );

    $setup->endSetup();
}