import { Transaction } from "../_tx";
import { Operator } from "./_base";
export declare abstract class InitialAndChanges<T> extends Operator<T, T> {
    private b;
    activate(initialNeeded: boolean): void;
    dispose(): void;
    next(tx: Transaction, val: T): void;
    abstract nextInitial(tx: Transaction, val: T): void;
    abstract nextChange(tx: Transaction, val: T): void;
}
export declare abstract class Changes<T> extends InitialAndChanges<T> {
    nextInitial(tx: Transaction, val: T): void;
}
export declare abstract class Initial<T> extends InitialAndChanges<T> {
    nextChange(tx: Transaction, val: T): void;
}