Custom SearchWP Gutenberg Block Parser

searchwp-customizations.php

<?php

// Disable automatic block parsing during SearchWP index.
add_filter( 'searchwp\source\post\attributes\content\do_blocks', '__return_false' );

// SearchWP custom Block parser.
add_filter( 'searchwp\source\post\attributes\content', function( $content, $args ) {
	if ( 'post' === $args['post']->post_type ) {
		// This will hold the content we want to index for this Post.
		$content_to_index = '';

		// These are the only Gutenberg Blocks we want to index.
		$blocks_to_index = [
			'core/heading',
			'core/paragraph',
			'core/list',
			'core/quote',
			'core/table',
		];

		// Loop over the Blocks of this Post and render the content
		// for the Blocks we want, skip the Blocks we don't.
		$blocks = parse_blocks( $content );
		foreach ( $blocks as $block ) {
			if ( in_array( $block['blockName'], $blocks_to_index, true ) ) {
				$content_to_index .= render_block( $block );
			}
		}

		// Replace the incoming $content with the rendered Block content.
		$content = $content_to_index;
	}

	return $content;
}, 10, 2 );

This wasn't working for me until I added $blocks = parse_blocks( $content ); before the foreach