import type { Option, u32 } from '@polkadot/types';
import type { BlockNumber, EraIndex, Moment, SessionIndex } from '@polkadot/types/interfaces';
export interface DeriveSessionIndexes {
    activeEra: EraIndex;
    activeEraStart: Option<Moment>;
    currentEra: EraIndex;
    currentIndex: SessionIndex;
    validatorCount: u32;
}
export interface DeriveSessionInfo extends DeriveSessionIndexes {
    eraLength: BlockNumber;
    isEpoch: boolean;
    sessionLength: BlockNumber;
    sessionsPerEra: SessionIndex;
}
export interface DeriveSessionProgress extends DeriveSessionInfo {
    eraProgress: BlockNumber;
    sessionProgress: BlockNumber;
}