export interface SystemInfo {
    version: string;
    platform: string;
    platformName: string;
    binaryInstalled: boolean;
    binarySource?: 'npm' | 'local';
    binaryPath?: string;
    nodeVersion: string;
}
export declare class TerminalApp {
    private systemInfo;
    private outputLines;
    private userInputLines;
    private inputBuffer;
    private showPopup;
    private popupIndex;
    private scrollOffset;
    private running;
    private loading;
    private spinnerFrame;
    private spinnerTimer;
    private spinnerLineIdx;
    private onSubmit;
    private directWrite;
    private static SPINNER;
    constructor(systemInfo: SystemInfo);
    start(onSubmit: (input: string) => Promise<void>): void;
    private buildWelcomeHeader;
    private startSpinner;
    private stopSpinner;
    private buildSpinnerLine;
    stop(): void;
    addOutput(text: string): void;
    captureOutput(fn: () => Promise<void>): Promise<void>;
    private popupMode;
    private popupDepth;
    private getPopupItems;
    private getContentHeight;
    render: () => void;
    private write;
    private renderInputBar;
    private moveTo;
    private handleKey;
    private applyCompletion;
    private updatePopup;
}
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