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Activate Gutenberg on custom post types

If you want to enable Gutenberg in Custom Post Types (CTP), you can do so with the following line:

function custom_post_example() {
	register_post_type( 'example',
		array(
		...
			'show_in_rest' => true, 
		...
		)
	);
}

Here is just an excerpt for the line that should be added to the $args array.