/**
 * Shared between the transactional email list and detail pages so both
 * render the same "unknown vs. zero" and provider-availability rules.
 */
export interface EmailEngagement {
    templateId: string;
    delivered: number;
    uniqueOpens: number;
    uniqueClicks: number;
    /** null when nothing was delivered in the window, so there is no rate yet. */
    openRate: number | null;
}
export type ProviderMetricsResult<T> = {
    available: true;
    data: T;
} | {
    available: false;
    reason: string;
};
/**
 * Renders a metric the backend could not read. "Unknown" and "zero" must stay
 * visibly different — a dash with a reason is the only honest rendering.
 */
export declare function UnknownMetric({ reason }: {
    reason: string;
}): import("node_modules/@types/react").JSX.Element;
export declare function SendsCell({ sent, failed, }: {
    sent: number | null;
    failed: number | null;
}): import("node_modules/@types/react").JSX.Element;
export declare function OpenRateCell({ engagement, unavailableReason, loading, }: {
    engagement: EmailEngagement | undefined;
    unavailableReason: string | null;
    loading: boolean;
}): import("node_modules/@types/react").JSX.Element;
export declare function LastSentCell({ lastSentAt, sent, }: {
    lastSentAt: number | null;
    sent: number | null;
}): import("node_modules/@types/react").JSX.Element;
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