import type { BufferGeometry, Material, Mesh } from 'three';
/**
 * Shows a paint preview by giving `mesh` another material (or material
 * array), and `groups` with it when the preview also regroups the geometry's
 * triangles onto that array; returns the undo. Groups and materials index into
 * each other, so the undo only puts back what still is the preview's: groups
 * a rebuild or commit replaced meanwhile stay, and the original material goes
 * back only over groups it can draw — restoring an older, shorter array over a
 * rebuilt geometry's groups would leave a group with no material, which the
 * next raycast trips over on `material.side`.
 */
export declare function swapPreviewMaterial(mesh: Mesh, preview: Material | Material[], groups?: BufferGeometry['groups']): () => void;
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