import type { Transform } from '@gltf-transform/core';
/** Options for the {@link normals} function. */
export interface NormalsOptions {
    /** Whether to overwrite existing `NORMAL` attributes. */
    overwrite?: boolean;
}
/**
 * Generates flat vertex normals for mesh primitives.
 *
 * Example:
 *
 * ```ts
 * import { normals } from '@gltf-transform/functions';
 *
 * await document.transform(normals({overwrite: true}));
 * ```
 *
 * @category Transforms
 */
export declare function normals(_options?: NormalsOptions): Transform;