/**
 * AppShell geometry and collapse priority. Side regions collapse by fit, not
 * viewport breakpoints. Pixel values have no current semantic token scale.
 * TODO(carto-tokens): move these to `layout.size.*` if one ships.
 */
/** Collapsible/resizable side regions. Chat is always the center. */
export type SideRegion = "rail" | "artifact";
export type RegionWidths = {
    default: number;
    min: number;
    /**
     * Hard cap. Omit so the region may grow within remaining layout space.
     */
    max?: number;
};
/**
 * Artifact opening width. `regular` is fixed; `large` fills above its floor
 * while reserving chat space and collapsing the rail. Both remain resizable.
 */
export type ArtifactWidth = "regular" | "large";
export declare const DEFAULT_ARTIFACT_WIDTH: ArtifactWidth;
export declare const REGULAR_ARTIFACT_WIDTH = 560;
export declare const LARGE_ARTIFACT_WIDTH_FLOOR = 720;
/**
 * Chat's minimum **while the artifact fills for the `large` preset** (px) — a
 * roomier floor than {@link CHAT_MIN_WIDTH}, used only to compute `large`'s open
 * width. Ongoing fit/resize still uses the global chat-min.
 */
export declare const LARGE_ARTIFACT_CHAT_MIN = 440;
export declare const WIDTHS: Record<SideRegion, RegionWidths>;
export declare const RAIL_DRAWER_GUTTER = 40;
/**
 * Rail max is the lesser of its cap and the container minus
 * {@link RAIL_DRAWER_GUTTER}.
 */
export declare function maxRailWidth(containerWidth: number): number;
export declare function isRegionResizable(region: SideRegion): boolean;
export declare const CHAT_MIN_WIDTH = 360;
/**
 * Shell width above which the artifact must remain inline and the rail yields.
 * Distinct from the large preset floor despite the current shared value.
 */
export declare const ARTIFACT_INLINE_ONLY_WIDTH = 720;
export declare const KEYBOARD_RESIZE_STEP = 16;
/** Auto-collapse order, lowest priority first. Chat is never listed. */
export declare const COLLAPSE_PRIORITY: readonly SideRegion[];
/**
 * Resolves opening width. Large fills after reserving chat space and falls back
 * to its floor before measurement.
 */
export declare function artifactOpenWidth(preset: ArtifactWidth, containerWidth: number | null): number;
/** Whether opening at this preset should collapse the rail to reclaim its space. */
export declare function presetCollapsesRail(preset: ArtifactWidth): boolean;
/**
 * The widest the artifact can be **inline** without pushing chat below its
 * minimum. Dragging past this detaches the artifact into a drawer that keeps
 * growing up to the viewport. `railInline` is the rail's effective inline width
 * (0 when the rail isn't inline).
 */
export declare function inlineMaxArtifactWidth(containerWidth: number, railInline: number): number;
/**
 * Width an artifact **drawer** opens at, given the live drag target and the
 * shell width. Clamped to `[artifact.min, containerWidth]` — a drawer may grow
 * to the full viewport (chat stays inline at ≥ chat-min underneath).
 */
export declare function clampDrawerWidth(desired: number, containerWidth: number): number;
/**
 * Clamp a desired side-region width to its own bounds AND to the space left for
 * chat once the other side is accounted for. The result never forces chat below
 * its minimum. `otherSideWidth` is the other region's effective px (0 if
 * collapsed/absent).
 */
export declare function clampWidth(region: SideRegion, desired: number, containerWidth: number, otherSideWidth: number): number;