/**
 * Render-dimension policy for the headless xterm + screenshot canvas.
 *
 * Lives in its own file (not inside worker.ts) so tests can exercise the
 * pure resolver without importing the worker entrypoint, which has
 * module-load side effects (logger init, ipc-listener registration).
 */
/** Default render width for botmux-spawned CLIs — narrow enough for the
 *  web terminal to render comfortably and the card PNG to fit Lark's
 *  typical card width. */
export declare const DEFAULT_RENDER_COLS = 160;
export declare const DEFAULT_RENDER_ROWS = 50;
/** ZMX creates botmux-owned sessions without a TTY, so upstream falls back to
 * a fixed 120x24 until a human `zmx attach` becomes leader. Use that leaderless
 * default for the display projection only: a local attach can persist a
 * different geometry, so ZMX history is never authoritative enough to drive
 * state changes or synthetic keys. */
export declare const ZMX_RENDER_COLS = 120;
export declare const ZMX_RENDER_ROWS = 24;
/** Hard upper bound on render dimensions — protects snapshot/PNG memory
 *  if a pane is reported as unreasonably wide (or a malformed init
 *  payload sneaks past). 320 covers all real-world tmux pane widths
 *  including ultrawide monitors; beyond this the canvas balloons and
 *  Lark cards stop looking sensible. */
export declare const MAX_RENDER_COLS = 320;
export declare const MAX_RENDER_ROWS = 100;
/** Lower bound — keeps a degenerate 1-col pane from producing a
 *  near-empty canvas. */
export declare const MIN_RENDER_COLS = 80;
export declare const MIN_RENDER_ROWS = 24;
/** Numeric clamp with NaN/Infinity guards. NaN snaps to the lower bound
 *  (safe default), ±Infinity to the matching bound. */
export declare function clamp(value: number, lo: number, hi: number): number;
export interface RenderDimensions {
    cols: number;
    rows: number;
}
export interface RenderDimensionConfig {
    adoptMode?: boolean;
    adoptPaneCols?: number;
    adoptPaneRows?: number;
    backendType?: string;
}
/** Compute the render dimensions for a session. Adopt mode pegs to the
 *  source pane (clamped to safe bounds); everything else uses the
 *  defaults so the web terminal + card stay narrow.
 *
 *  Why this matters: when the renderer is narrower than the source pane,
 *  ANSI meant for col 270 wraps to row 2 in the renderer's xterm. The
 *  snapshot then reads "row 2's first 160 cols" as the wrap target +
 *  whatever Claude actually wrote on row 2 — producing the duplicated /
 *  stair-stepped screenshot the live failure showed. Picking the correct
 *  width up-front (in `init` BEFORE startScreenUpdates) is the only fix
 *  that doesn't leave wrapped state in xterm's buffer. */
export declare function resolveRenderDimensions(cfg: RenderDimensionConfig): RenderDimensions;
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