import type { ChipMeta } from './statusline-picker.js';
interface MailboxActivityStatus {
    unread: number;
    onlineAgents: number;
    onlineClients: {
        tui: number;
        webui: number;
        repl: number;
    };
    lastSubject?: string | null | undefined;
    lastFrom?: string | null | undefined;
}
export declare function isStreamChipVisible(key: 'brain' | 'mailbox' | 'enhance' | 'debug_stream', dataIsPresent: unknown, hiddenSet: ReadonlySet<string>, visibleChips: ChipMeta[]): boolean;
export declare function hasMailboxActivity(mailbox: MailboxActivityStatus | undefined): boolean;
export declare function modeIcon(label?: string): string;
export declare function formatSuggestionLabel(label: string, maxLen?: number): string;
export declare function countdownColor(secs: number, warn: number, danger: number): string;
export {};
//# sourceMappingURL=status-bar-helpers.d.ts.map