wp_theme_has_theme_json(): bool

391function wp_theme_has_theme_json() {392	static $theme_has_support = array();393 394	$stylesheet = get_stylesheet();395 396	if (397		isset( $theme_has_support[ $stylesheet ] ) &&398		/*399		 * Ignore static cache when the development mode is set to 'theme', to avoid interfering with400		 * the theme developer's workflow.401		 */402		! wp_is_development_mode( 'theme' )403	) {404		return $theme_has_support[ $stylesheet ];405	}406 407	$stylesheet_directory = get_stylesheet_directory();408	$template_directory   = get_template_directory();409 410	// This is the same as get_theme_file_path(), which isn't available in load-styles.php context411	if ( $stylesheet_directory !== $template_directory && file_exists( $stylesheet_directory . '/theme.json' ) ) {412		$path = $stylesheet_directory . '/theme.json';413	} else {414		$path = $template_directory . '/theme.json';415	}416 417	/** This filter is documented in wp-includes/link-template.php */418	$path = apply_filters( 'theme_file_path', $path, 'theme.json' );419 420	$theme_has_support[ $stylesheet ] = file_exists( $path );421 422	return $theme_has_support[ $stylesheet ];423}