How to use the @wordpress/block-editor.__experimentalGetGradientClass function in @wordpress/block-editor

} = attributes;

	const isGradientAvailable = !! getGradientClass;

	const textColorClass = getColorClassName( 'color', textColor );
	const fontSizeClass = getFontSizeClass( fontSize );
	const borderClass = getColorClassName( 'border-color', borderColor );
	const buttonBackgroundClass = getColorClassName( 'background-color', buttonBackgroundColor );
	const buttonGradientClass = isGradientAvailable ? getGradientClass( buttonGradient ) : undefined;

	const emailFieldBackgroundClass = getColorClassName(
		'background-color',
		emailFieldBackgroundColor
	);
	const emailFieldGradientClass = isGradientAvailable
		? getGradientClass( emailFieldGradient )
		: undefined;

	const sharedClasses = classnames(
		borderRadius === 0 ? 'no-border-radius' : undefined,
		fontSizeClass,
		borderClass
	);

	const submitButtonClasses = classnames(
		sharedClasses,
		textColor ? 'has-text-color' : undefined,
		textColorClass,
		buttonBackgroundColor || buttonGradient ? 'has-background' : undefined,
		buttonBackgroundClass,
		buttonGradientClass
	);

customFontSize,
		borderRadius,
		borderWeight,
		borderColor,
		customBorderColor,
		padding,
		spacing,
	} = attributes;

	const isGradientAvailable = !! getGradientClass;

	const textColorClass = getColorClassName( 'color', textColor );
	const fontSizeClass = getFontSizeClass( fontSize );
	const borderClass = getColorClassName( 'border-color', borderColor );
	const buttonBackgroundClass = getColorClassName( 'background-color', buttonBackgroundColor );
	const buttonGradientClass = isGradientAvailable ? getGradientClass( buttonGradient ) : undefined;

	const emailFieldBackgroundClass = getColorClassName(
		'background-color',
		emailFieldBackgroundColor
	);
	const emailFieldGradientClass = isGradientAvailable
		? getGradientClass( emailFieldGradient )
		: undefined;

	const sharedClasses = classnames(
		borderRadius === 0 ? 'no-border-radius' : undefined,
		fontSizeClass,
		borderClass
	);

	const submitButtonClasses = classnames(

save( { attributes } ) {
			const {
				backgroundType,
				gradient,
				customGradient,
				customOverlayColor,
				dimRatio,
				focalPoint,
				hasParallax,
				overlayColor,
				url,
				minHeight,
			} = attributes;
			const overlayColorClass = getColorClassName( 'background-color', overlayColor );
			const gradientClass = __experimentalGetGradientClass( gradient );

			const style = backgroundType === IMAGE_BACKGROUND_TYPE ?
				backgroundImageStyles( url ) :
				{};
			if ( ! overlayColorClass ) {
				style.backgroundColor = customOverlayColor;
			}
			if ( focalPoint && ! hasParallax ) {
				style.backgroundPosition = `${ focalPoint.x * 100 }% ${ focalPoint.y * 100 }%`;
			}
			if ( customGradient && ! url ) {
				style.background = customGradient;
			}
			style.minHeight = minHeight || undefined;

			const classes = classnames(