/**
 * Copyright 2017 Yahoo Holdings Inc.
 * Licensed under the terms of the MIT license. See LICENSE file in project root for terms.
 */
/**
 * Definition of terms:
 *
 * Entry
 * ------------
 * The object to be evaluated.  Entries have the following schema:
 *
 * {
 *     setting: 'acb',
 *     value: 1,
 *     except: [{
 *         value: 2,
 *         locale: ['en', 'uk']
 *     }]
 * }
 *
 *
 * Except
 * ------------
 * Every entry contains at least one except block.  Here's what an except block looks like:
 * `{
 *      value: 111,
 *      lang: ['en', 'us'],
 *      farm: [1111, 2222]
 * }`
 *
 * Every except block must contain an answer and at least one condition.  In the above example, the except block
 * contains an answer (the value) and two conditions (lang and farm).
 *
 *
 * Answer
 * ------------
 * Either `enabled` or `value`.  Every entry contains a default answer, which is specified at the top level
 * of an entry.  However, based on the conditions in the except block and the context given by the user,
 * the answer may change.
 *
 *
 * Condition
 * ------------
 * Conditions are used to evaluate whether to change the default answer or not.  The context passed in by the
 * user may or may not meet the conditions.  All conditions must be met to change the default answer.
 *
 *
 * Context
 * ------------
 * The data passed in by the user.  It is used to determine whether the conditions of except blocks are satisfied.
 * The keys of the context object must be the same as the conditions it is trying to fulfill.
 */
export declare class Evaluator {
    /** This allows the evaluator to make optimizations on each rule */
    static prepareEntry(configEntry: any): any;
    /**
     * @param {Object} entry Setting object
     *
     *  {
     *      setting: 'acb',
     *      value: 1,
     *      except: [{
     *          value: 2,
     *          locale: ['en', 'uk']
     *      }]
     *  }
     *
     * @param {Object} context Contextual data about the user
     * @param {Object} overrides Any specific overrides of the config for the user
     * @param {Object} answers An object containing the resolved answers.
     * @param {Object} customEvaluators Any custom evaluators for the config
     * @return {} The answer for the entry
     */
    static evaluate(entry: any, context: any, overrides?: any, answers?: any, customEvaluators?: any): {
        key: any;
        value: any;
    };
    /**
     * Checks whether the context satisfies ALL conditions of the given except block.
     * @param {Object} entry Setting.  Required because we need to know the name of the setting.
     * @param {Object} exceptBlock
     * `{
     *      value: 111,
     *      lang: ['en', 'us'],
     *      farm: [1111, 2222]
     * }`
     * @param {Object} context Contextual data about the user
     * @param {Object} answers An object containing the resolved answers.
     * @param {Object} customEvaluators Any custom evaluators for the config
     * @return {Boolean} TRUE if ALL conditions match, FALSE if ANY of the conditions fail.
     */
    private static _evaluateExceptBlock;
    /**
     * For the definiton of what an answer is, please refer to the `Definition of Terms` at the top of the file.
     *
     * @param {Object} entry Setting.  Required because we need to know the name of the setting.
     * @param {Object} [Optional] exceptBlock If an except block is passed, that means we want to get the answer from it
     *      We have to pass in the entry along with the exceptBlock because the exceptBlock does not contain the
     *      name of the setting.
     * @return {Object} An object that contains both the name and the value of the setting in this format:
     * ```
     * {
     *     key: name of the setting
     *     value: value of the setting
     * }
     * ```
     * It is returned in this format for the ease of use by the caller.
     */
    private static _getAnswer;
    /**
     * Evaluates a percentage condition and returns true if the percentage is less than the
     * requested 'qualifiedPercentage'.
     *
     * We require a context value 'percentageSeed' to be supplied in order to personalize
     * the percentage crc calculation.  'percentageSeed' can be either a string or a number.
     * The implementor should select a value for 'percentageSeed' that is unique for the user.
     *
     * @param {string} settingName The entry setting name.  Required because we need to know the name of the setting.
     * @param {Object} context Contextual data about the user
     * @param {number} qualifiedPercentage The percentage that we should qualify (return true).
     */
    private static _evaluatePercentage;
}