How to Add Container Div to Every Gutenberg-Block in WordPress

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If someone also need this nowadays WordPress already has another filter that is easier to implement called render_block

render_block

Here is an example

function wporg_block_wrapper( $block_content, $block ) {
        if ( $block['blockName'] === 'core/paragraph' ) {
            $content = '<div class="wp-block-paragraph">';
            $content .= $block_content;
            $content .= '</div>';
            return $content;
        } elseif ( $block['blockName'] === 'core/heading' ) {
            $content = '<div class="wp-block-heading">';
            $content .= $block_content;
            $content .= '</div>';
            return $content;
        }
        return $block_content;
    }

    add_filter( 'render_block', 'wporg_block_wrapper', 10, 2 );

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