import { FunCheckoutStep } from './FunCheckoutStep';
/**
 * Decide whether the checkout-complete success background should paint.
 *
 * The post-checkout `CHECKOUT_COMPLETE` step is the *page*, which also covers
 * pending and failed states — so step alone is not enough. We additionally
 * require:
 *  - the Statsig feature gate to be ON (kill-switch / per-customer rollout),
 *  - and the underlying checkout/direct-execution to have actually settled.
 *
 * Pure function (no hooks) so the gating contract is easy to unit-test.
 * The caller is responsible for deriving `isCompleted` from whichever hook
 * is appropriate for the path (deposit-address checkout vs direct execution).
 */
export declare function selectSuccessScreenBackground({ step, isCompleted, isFeatureGateEnabled, themeBackgroundOverlay, }: {
    step: FunCheckoutStep;
    /** Whether the underlying checkout/direct-execution has reached COMPLETED. */
    isCompleted: boolean;
    /** Statsig gate (`enable-checkout-success-screen-background`). */
    isFeatureGateEnabled: boolean;
    /**
     * The theme variable reference for the success-screen overlay
     * (`themeVars.colors.modalBackgroundCheckoutComplete`). Resolves at runtime
     * to whatever the active theme defines — Aave's translucent gradient
     * stack, or by default the regular modal background (which renders as a
     * no-op overlay).
     */
    themeBackgroundOverlay: string;
}): string | undefined;