/**
 * Split-pane terminal layout for the installer UI
 *
 * Left pane (fixed): ARE ASCII banner + rotating golden circle + version info
 * Right pane (scrolling viewport): Interactive prompts, progress, results
 *
 * The right pane is locked to the same vertical height as the left pane.
 * When content overflows, older lines scroll up within the bounded region.
 *
 * Uses ANSI escape codes for cursor positioning and region management.
 */
export interface LayoutConfig {
    /** Width of the left pane in characters */
    leftWidth: number;
    /** Padding between panes */
    padding: number;
}
export declare function clearScreen(): void;
export declare class SplitPaneLayout {
    private leftWidth;
    private padding;
    private totalWidth;
    private rightCol;
    private rightWidth;
    private leftContent;
    private separatorCol;
    private enabled;
    /** All right-pane lines (the full buffer) */
    private rightBuffer;
    /** First row of the right pane viewport (1-based) */
    private viewportTop;
    /** Maximum number of visible rows in the right pane (matches left pane height) */
    private viewportHeight;
    /** Logical cursor: next line index in rightBuffer to write to */
    private rightCursor;
    constructor(config?: Partial<LayoutConfig>);
    /** Whether the split-pane layout is active */
    get isEnabled(): boolean;
    /** Get the column where the right pane starts */
    get rightPaneCol(): number;
    /** Get the logical cursor position (index into rightBuffer) */
    get currentRightRow(): number;
    /** Get the width available for right pane content */
    get rightPaneWidth(): number;
    /**
     * Set left pane content (array of pre-formatted lines).
     * Also sets the right pane viewport height to match.
     */
    setLeftPane(lines: string[]): void;
    /** Render the left pane content at its fixed position. */
    renderLeftPane(): void;
    /**
     * Draw the vertical separator between panes.
     * @param height - Number of rows to draw
     */
    drawSeparator(height: number): void;
    /**
     * Append a line of text to the right pane.
     * If the viewport is full, older lines scroll up.
     */
    appendRight(text: string): void;
    /**
     * Set the logical cursor to a specific buffer index.
     * Used by prompts to overwrite lines for re-rendering selections.
     */
    setRightRow(row: number): void;
    /**
     * Clear right pane from a given buffer index downward.
     */
    clearRightFrom(row: number): void;
    /**
     * Force a full re-render of the right pane viewport.
     * Call after external operations that may have overwritten screen content.
     */
    refreshRight(): void;
    /**
     * Move cursor below all content for clean exit.
     */
    finalize(): void;
    /**
     * Render the visible portion of the right pane buffer.
     * Shows the last `viewportHeight` lines of the buffer.
     */
    private renderRightViewport;
    /**
     * Wrap text to fit within a given width.
     * Preserves ANSI color codes during wrapping.
     */
    private wrapText;
}
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