/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/**
 * The flex API permits 3 or 1 parts of the value:
 *    - `flex-grow flex-shrink flex-basis`, or
 *    - `flex-basis`
 */
export declare function validateBasis(basis: string, grow?: string, shrink?: string): string[] | number[];