How To Paginate A Custom Post Type Query

This took some time to figure out because my custom post type query was interfering with the global query object. This is a little hack that I found on stack exchange that helped me solve the issue.

$paged = ( get_query_var( 'page' ) ) ? get_query_var( 'page' ) : 1;
$args  = array(
	'post_type'      => array( 'custom-post-type-1', 'custom-post-type-2' ),
	'posts_per_page' => '3',
	'nopaging'       => false,
	'paged'          => $paged,
);

$query = new WP_Query( $args );

global $wp_query;
// Put default query object in a temp variable
$tmp_query = $wp_query;
// Now wipe it out completely
$wp_query = null;
// Re-populate the global with our custom query
$wp_query = $query;

?>
	
<div id="posts">
	<?php
	if ( $query->have_posts() ) :
		while ( $query->have_posts() ) : $query->the_post(); ?>
            <div class="post <?= get_the_category()[0]->slug; ?>">
                <h4><a href="#" target="_blank"><?php the_title(); ?></a></h4>
                <div class="content">
					<?php the_content(); ?>
                </div>
            </div>
		<?php endwhile;
	endif;
	?>
</div>
<?php
echo '<div class="pagination">';
previous_posts_link( '« Newer posts' );
next_posts_link( 'Older posts »', $query->max_num_pages );
echo '</div>';

// reset post data
wp_reset_postdata();

// Restore original query object
$wp_query = null;
$wp_query = $tmp_query;