/**
 * A CSS printer controls how CSS is formatted for style element
 * text content.
 *
 * Using a custom CSS printer may be useful useful for minifying or
 * auto-prefixing.
 *
 * _MUST REMAIN STABLE BETWEEN VERSIONS!_
 */
export interface ICssPrinter {
    /**
     * Return an indented CSS property string. The key will be null
     * for at-rules (`@`).
     */
    property(indent: string, key: string | null, values: string[]): string;
    /**
     * Return an indented block opening with the given conditions.
     */
    openBlock(indent: string, conditions: string[]): string;
    /**
     * Return an indented block closing.
     */
    closeBlock(indent?: string): string;
}