Registers the style and typography block attributes for block types that support it.

function wp_register_typography_support( $block_type ) {
	if ( ! property_exists( $block_type, 'supports' ) ) {
		return;
	}

	$typography_supports = _wp_array_get( $block_type->supports, array( 'typography' ), false );
	if ( ! $typography_supports ) {
		return;
	}

	$has_font_family_support     = _wp_array_get( $typography_supports, array( '__experimentalFontFamily' ), false );
	$has_font_size_support       = _wp_array_get( $typography_supports, array( 'fontSize' ), false );
	$has_font_style_support      = _wp_array_get( $typography_supports, array( '__experimentalFontStyle' ), false );
	$has_font_weight_support     = _wp_array_get( $typography_supports, array( '__experimentalFontWeight' ), false );
	$has_letter_spacing_support  = _wp_array_get( $typography_supports, array( '__experimentalLetterSpacing' ), false );
	$has_line_height_support     = _wp_array_get( $typography_supports, array( 'lineHeight' ), false );
	$has_text_decoration_support = _wp_array_get( $typography_supports, array( '__experimentalTextDecoration' ), false );
	$has_text_transform_support  = _wp_array_get( $typography_supports, array( '__experimentalTextTransform' ), false );

	$has_typography_support = $has_font_family_support
		|| $has_font_size_support
		|| $has_font_style_support
		|| $has_font_weight_support
		|| $has_letter_spacing_support
		|| $has_line_height_support
		|| $has_text_decoration_support
		|| $has_text_transform_support;

	if ( ! $block_type->attributes ) {
		$block_type->attributes = array();
	}

	if ( $has_typography_support && ! array_key_exists( 'style', $block_type->attributes ) ) {
		$block_type->attributes['style'] = array(
			'type' => 'object',
		);
	}

	if ( $has_font_size_support && ! array_key_exists( 'fontSize', $block_type->attributes ) ) {
		$block_type->attributes['fontSize'] = array(
			'type' => 'string',
		);
	}

	if ( $has_font_family_support && ! array_key_exists( 'fontFamily', $block_type->attributes ) ) {
		$block_type->attributes['fontFamily'] = array(
			'type' => 'string',
		);
	}
}