Block Editor - Disable Core Blocks

editor-blocks.php

<?php 

function editor_disable_core_blocks() {
  $blacklist = array(
    // -- Common
    'core/paragraph',
    'core/image',
    'core/heading',
    'core/subhead',
    'core/gallery',
    'core/list',
    'core/quote',
    'core/audio',
    'core/cover',
    'core/file',
    'core/video',
    // -- Formatting
    'core/table',
    'core/verse',
    'core/code',
    'core/freeform',
    'core/html',
    'core/preformatted',
    'core/pullquote',
    // -- Layout
    'core/columns',
    'core/column',
    'core/buttons',
    'core/button',
    'core/group',
    'core/media-text',
    'core/text-columns',
    'core/more',
    'core/nextpage',
    'core/separator',
    'core/spacer',
    // -- Widgets
    'core/social-links',
    'core/shortcode',
    'core/archives',
    'core/categories',
    'core/latest-comments',
    'core/latest-posts',
    'core/calendar',
    'core/rss',
    'core/search',
    'core/tag-cloud',
    // -- Embeds
    'core/embed',
    'core-embed/twitter',
    'core-embed/youtube',
    'core-embed/facebook',
    'core-embed/instagram',
    'core-embed/wordpress',
    'core-embed/soundcloud',
    'core-embed/spotify',
    'core-embed/flickr',
    'core-embed/vimeo',
    'core-embed/animoto',
    'core-embed/cloudup',
    'core-embed/collegehumor',
    'core-embed/dailymotion',
    'core-embed/funnyordie',
    'core-embed/hulu',
    'core-embed/imgur',
    'core-embed/issuu',
    'core-embed/kickstarter',
    'core-embed/meetup-com',
    'core-embed/mixcloud',
    'core-embed/photobucket',
    'core-embed/polldaddy',
    'core-embed/reddit',
    'core-embed/reverbnation',
    'core-embed/screencast',
    'core-embed/scribd',
    'core-embed/slideshare',
    'core-embed/smugmug',
    'core-embed/speaker',
    'core-embed/ted',
    'core-embed/tumblr',
    'core-embed/videopress',
    'core-embed/wordpress-tv',
    'core-embed/amazon-kindle',
    'core-embed/tiktok',
    'core-embed/speaker-deck',
    'core-embed/crowdsignal',
  );
?>
<script>
  var blocksBlacklist = <?php echo json_encode( $blacklist ); ?>;
  
  wp.blocks.getBlockTypes().forEach(function(blockType) {
    if (blocksBlacklist.indexOf(blockType.name) >= 0 ) {
      wp.blocks.unregisterBlockType(blockType.name);
    }
  });

  wp.hooks.addFilter('blocks.registerBlockType', 'modifyBlockType', function(settings, name) {
    if (blocksBlacklist.indexOf(name) > -1) {
      settings = $.extend(true, settings, {
        supports: {
          inserter: false
        }
      });
    }

    return settings;
  });
</script>
<?php
}
add_action( 'print_default_editor_scripts', 'editor_disable_core_blocks', 999 );