/**
 * Apply an alpha to a hex color, returning an `rgba(...)` string. Replaces the
 * engine's `bg-primary/10`-style alpha suffix: `alpha(tokens.primary, 0.1)`.
 * `a` is a 0..1 fraction. Non-hex inputs (already-translucent token values,
 * "transparent") are returned unchanged so callers can pass any token safely.
 */
export declare function alpha(color: string, a: number): string;
/**
 * Blend `over` into `base` by `t` (a 0..1 fraction) in the Oklab space, returning
 * an `rgb(...)` string. The RN equivalent of the hand-off's
 * `color-mix(in oklab, <over> <t*100>%, <base>)`, matching it channel for channel,
 * so a skin can transcribe a blended CSS fill without a web colour function.
 *
 * Both colours must be hex (the shape every colour token takes); a non-hex input
 * (an already-translucent token value, "transparent") returns `base` unchanged,
 * the same defensive contract `alpha()` follows.
 */
export declare function mixOklab(base: string, over: string, t: number): string;
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