import { Transform } from '@gltf-transform/core';
/** Options for the {@link sparse} function. */
export interface SparseOptions {
    /**
     * Threshold ratio used to determine when an accessor should be sparse.
     * Default: 1 / 3.
     */
    ratio: number;
}
/**
 * Scans all {@link Accessor Accessors} in the Document, detecting whether each Accessor
 * would benefit from sparse data storage. Currently, sparse data storage is used only
 * when many values (>= ratio) are zeroes. Particularly for assets using morph target
 * ("shape key") animation, sparse data storage may significantly reduce file sizes.
 *
 * Example:
 *
 * ```ts
 * import { sparse } from '@gltf-transform/functions';
 *
 * accessor.getArray(); // → [ 0, 0, 0, 0, 0, 25.0, 0, 0, ... ]
 * accessor.getSparse(); // → false
 *
 * await document.transform(sparse({ratio: 1 / 10}));
 *
 * accessor.getSparse(); // → true
 * ```
 *
 * @experimental
 * @category Transforms
 */
export declare function sparse(_options?: SparseOptions): Transform;