/**
 * Renderer-independent responsive layout engine (V2-032).
 *
 * Computes the shell region rectangles from terminal dimensions and user
 * preferences following the density rules in ARCHITECTURE.md. It performs no
 * IO and reads no globals so layout can be snapshot-tested at any dimension
 * without a live terminal.
 */
export type LayoutDensity = "compact" | "single" | "wide";
export type PlanPlacement = "hidden" | "overlay" | "split";
export interface Rect {
    readonly x: number;
    readonly y: number;
    readonly width: number;
    readonly height: number;
}
export interface LayoutInput {
    readonly columns: number;
    readonly rows: number;
    /** User toggle: whether the plan pane is requested at all. */
    readonly planVisible?: boolean | undefined;
    /** User/config toggle: whether split view is permitted on wide terminals. */
    readonly splitEnabled?: boolean | undefined;
}
export interface LayoutModel {
    readonly density: LayoutDensity;
    readonly columns: number;
    readonly rows: number;
    /** Optional chrome (borders, hints, condensed status detail) survives. */
    readonly showOptionalChrome: boolean;
    readonly statusCondensed: boolean;
    readonly chat: Rect;
    readonly composer: Rect;
    readonly status: Rect;
    readonly plan: Rect & {
        readonly placement: PlanPlacement;
    };
    /** Full-screen portal target for blocking overlays/pickers/modals. */
    readonly overlay: Rect;
}
export declare const COMPACT_MAX_COLS = 79;
export declare const SINGLE_MAX_COLS = 119;
export declare const MIN_ROWS_FOR_STANDARD = 20;
export declare const PLAN_MIN_WIDTH = 34;
export declare const PLAN_MAX_WIDTH = 52;
export declare const CHAT_MIN_WIDTH_SPLIT = 72;
export declare const DIVIDER_WIDTH = 1;
export declare const MIN_CHAT_ROWS = 6;
export declare const STATUS_HEIGHT = 1;
/**
 * Cap on editable composer text rows (not including border chrome).
 * Grows with Shift+Enter / wrap up to this; classic could take most of the
 * terminal — ~18 (~10% over the prior 16) keeps multi-line usable without
 * eating the transcript.
 */
export declare const COMPOSER_MAX_HEIGHT = 18;
export declare const COMPOSER_MIN_HEIGHT = 1;
/** Single editable line by default (classic Ink). Grows only if content needs it. */
export declare const COMPOSER_PREFERRED_HEIGHT = 1;
export declare function computeLayout(input: LayoutInput): LayoutModel;