export interface CssValueVerdict {
    ok: boolean;
    /** why it was rejected, phrased for a finding message */
    reason?: string;
}
/** Is this authored value safe to interpolate into a stylesheet or a style
 *  attribute? Conservative by design: a rejected value is dropped and reported
 *  as a finding, never silently passed through. */
export declare function checkCssValue(raw: string): CssValueVerdict;
/** Convenience predicate for call sites that do not need the reason. */
export declare const isSafeCssValue: (raw: string) => boolean;