/**
 * Canonicalize a computed-style value: rewrite every parseable color to one `rgba(...)`
 * form and normalize comma/whitespace runs outside quotes. Unparseable colors and quoted
 * strings are left untouched, so only provably-equal values ever collapse.
 */
export declare function canonicalizeStyleValue(value: string): string;
/** Two computed-style values are equal if they canonicalize to the same string. */
export declare function styleValuesEqual(a: string, b: string): boolean;