/**
 * Manifold 2D Extrusion and Operations
 *
 * Functions for extruding 2D shapes into 3D and performing 2D operations.
 * These replace the Rust WASM extrusion implementations.
 */
import type { ManifoldObject } from "./types";
/**
 * Linear extrude - Extrude a 2D shape along the Z-axis
 *
 * @param shape - Shape to extrude (can be 3D manifold, will be projected to 2D first)
 * @param height - Height to extrude
 * @param twist - Twist angle in degrees (default: 0)
 * @param scaleTop - Scale factor at top (number or [x, y]) (default: 1)
 * @param slices - Number of slices for twist (default: based on twist angle)
 * @param center - Center the extrusion vertically (default: false)
 */
export declare function linearExtrude(shape: ManifoldObject, height: number, twist?: number, scaleTop?: number | [number, number], slices?: number, center?: boolean): ManifoldObject;
/**
 * Rotate extrude - Revolve a 2D shape around the Y-axis
 *
 * @param shape - Shape to revolve (will be projected to 2D first)
 * @param angle - Angle to revolve in degrees (default: 360)
 * @param segments - Number of segments (default: based on $fn or angle)
 */
export declare function rotateExtrude(shape: ManifoldObject, angle?: number, segments?: number): ManifoldObject;
/**
 * Offset - Expand or contract a 2D shape
 *
 * @param shape - Shape to offset (will be projected to 2D first)
 * @param delta - Offset distance (positive = expand, negative = contract)
 * @param chamfer - Use chamfer/miter instead of round (default: false)
 * @param segments - Number of segments for round corners
 */
export declare function offset(shape: ManifoldObject, delta: number, chamfer?: boolean, segments?: number): ManifoldObject;
/**
 * Resize a shape to specific dimensions
 *
 * @param shape - Shape to resize
 * @param newSize - [width, height, depth] target dimensions
 * @param auto - Maintain aspect ratio (default: false)
 */
export declare function resize(shape: ManifoldObject, newSize: [number, number, number], auto?: boolean): ManifoldObject;
/**
 * Project a 3D manifold to 2D (orthographic projection onto XY plane)
 * Returns a thin 3D manifold representing the 2D projection
 */
export declare function project(manifold: ManifoldObject): ManifoldObject;
/**
 * Helper: Check if a manifold is effectively 2D (very thin in Z)
 */
export declare function is2D(manifold: ManifoldObject, threshold?: number): boolean;
/**
 * Helper: Get the thickness of a manifold in Z direction
 */
export declare function getThickness(manifold: ManifoldObject): number;
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