export interface OpenInvoice {
    ref: string;
    dueDateMs: number;
    outstanding: number;
}
export interface AgeBuckets {
    current: number;
    d31to60: number;
    d61to90: number;
    d90plus: number;
    total: number;
}
export declare function ageBuckets(invoices: readonly OpenInvoice[], now: number): AgeBuckets;
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