/**
 * Copyright 2022 IBM Corp. All Rights Reserved.
 *
 * 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 BTree from 'sorted-btree';
export interface RolloutPhase {
    percentage: number;
    duration: number | null;
    duration_type: string | null;
}
export interface RolloutConfiguration {
    start_at: string;
    phases: RolloutPhase[];
}
export declare class PhaseScheduler {
    static timestamps: number[];
    static timerId: ReturnType<typeof setTimeout> | null;
    static onPhaseCallback: () => void;
    private constructor();
    static addTimestamp(timestamp: number): void;
    private static scheduleNext;
    static reset(): void;
}
/**
 * Parses progressive rollout phases into a B-Tree for efficient timestamp-to-percentage lookups
 * @param configuration - The rollout configuration object
 * @returns BTree mapping timestamp (ms) to percentage, or null on error
 */
export declare function parseRolloutConfigurationPhases(configuration: RolloutConfiguration | null | undefined): BTree<number, number> | null;
/**
 * Returns the current rollout percentage based on current time
 * @param rolloutMap - BTree mapping timestamp to percentage
 * @returns Current rollout percentage
 */
export declare function getCurrentRolloutPercentage(rolloutMap: BTree<number, number> | null): number;