/**
 * A theme color at a given opacity, as `rgba(...)`.
 *
 * Themes are authored as hex, so a surface the design draws semi-transparent
 * can't just be looked up — it has to be composed from the opaque token. Any
 * alpha already on the token is multiplied in, so a token that is itself
 * translucent doesn't get promoted.
 *
 * A color `colord` can't parse is returned untouched: a host may hand the theme
 * something exotic, and a wrong color is worse than an un-dimmed one.
 */
export declare function withAlpha(color: string, alpha: number): string;
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