/**
 * A regular expression that can be used to test for the header comment in a compiled CSS file.
 */
export declare const REGEXP_COMMENT_HEADER: RegExp;
/**
 * A regular expression that can be used to test for the definition URL in a compiled CSS file.
 */
export declare const REGEXP_COMMENT_DEFINITION_REF: RegExp;
/**
 * A regular expression that can be used to test for the footer comment in a compiled CSS file.
 */
export declare const REGEXP_COMMENT_FOOTER: RegExp;
/**
 * Determines if the given URL for a definition is valid.
 *
 * The following are valid:
 * - Path relative to the current file on the filesystem.
 * - Embedded base64 data.
 *
 * The following are invalid:
 * - Absolute paths.
 * - URLs with a protocol other than data.
 *
 * @param urlOrPath - The definition URL to check.
 * @returns True if valid given the above rules, false otherwise.
 */
export declare function isDefinitionUrlValid(urlOrPath: string): boolean;
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