/****************************************************************************
 * Copyright 2018, 2021, Optimizely, Inc. and contributors                  *
 *                                                                          *
 * Licensed under the Apache License, Version 2.0 (the "License");          *
 * you may not use this file except in compliance with the License.         *
 * You may obtain a copy of the License at                                  *
 *                                                                          *
 *    http://www.apache.org/licenses/LICENSE-2.0                            *
 *                                                                          *
 * Unless required by applicable law or agreed to in writing, software      *
 * distributed under the License is distributed on an "AS IS" BASIS,        *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
 * See the License for the specific language governing permissions and      *
 * limitations under the License.                                           *
 ***************************************************************************/
import { Platform } from '../../platform_support';
export declare const DEFAULT_OPERATOR_TYPES: string[];
export type ConditionTree<Leaf> = Leaf | unknown[];
type LeafEvaluator<Leaf> = (leaf: Leaf) => boolean | null;
/**
 * Top level method to evaluate conditions
 * @param  {ConditionTree<Leaf>}    conditions      Nested array of and/or conditions, or a single leaf
 *                                                  condition value of any type
 *                                                  Example: ['and', '0', ['or', '1', '2']]
 * @param  {LeafEvaluator<Leaf>}    leafEvaluator   Function which will be called to evaluate leaf condition
 *                                                  values
 * @return {?boolean}                               Result of evaluating the conditions using the operator
 *                                                  rules and the leaf evaluator. A return value of null
 *                                                  indicates that the conditions are invalid or unable to be
 *                                                  evaluated.
 */
export declare function evaluate<Leaf>(conditions: ConditionTree<Leaf>, leafEvaluator: LeafEvaluator<Leaf>): boolean | null;
export declare const __platforms: Platform[];
export {};
