export type BillingStatus = "active" | "grace" | "blocked" | "expired";
export type PlanTier = "free" | "pro" | "pro_plus" | "ultimate";
export type GatedFeature = "quirk" | "analyst" | "web_search" | "advanced_model";
export declare function formatPlanLabel(plan: string): string;
export declare function formatFeatureLabel(feature: GatedFeature): string;
export declare function formatBillingPeriodEnd(periodEnd: string): string;
export declare function creditUsagePercent(creditsUsed: number, limit: number): number;
export declare function creditsRemaining(creditsUsed: number, limit: number): number;
export declare function formatCreditMultiplier(multiplier: number): string;
export declare const GRACE_BANNER_DISMISS_KEY = "zero-shot-grace-period-banner-dismissed";
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