import { IObservableWithChange, IReader } from "./base.js";
export interface IChangeTracker<TChangeSummary> {
    createChangeSummary(previousChangeSummary: TChangeSummary | undefined): TChangeSummary;
    handleChange(ctx: IChangeContext, change: TChangeSummary): boolean;
    beforeUpdate?(reader: IReader, change: TChangeSummary): void;
}
export interface IChangeContext {
    readonly changedObservable: IObservableWithChange<any, any>;
    readonly change: unknown;
    /**
     * Returns if the given observable caused the change.
     */
    didChange<T, TChange>(observable: IObservableWithChange<T, TChange>): this is {
        change: TChange;
    };
}
/**
 * Subscribes to and records changes and the last value of the given observables.
 * Don't use the key "changes", as it is reserved for the changes array!
*/
export declare function recordChanges<TObs extends Record<any, IObservableWithChange<any, any>>>(obs: TObs): IChangeTracker<{
    [TKey in keyof TObs]: ReturnType<TObs[TKey]["get"]>;
} & {
    changes: readonly ({
        [TKey in keyof TObs]: {
            key: TKey;
            change: TObs[TKey]["TChange"];
        };
    }[keyof TObs])[];
}>;
/**
 * Subscribes to and records changes and the last value of the given observables.
 * Don't use the key "changes", as it is reserved for the changes array!
*/
export declare function recordChangesLazy<TObs extends Record<any, IObservableWithChange<any, any>>>(getObs: () => TObs): IChangeTracker<{
    [TKey in keyof TObs]: ReturnType<TObs[TKey]["get"]>;
} & {
    changes: readonly ({
        [TKey in keyof TObs]: {
            key: TKey;
            change: TObs[TKey]["TChange"];
        };
    }[keyof TObs])[];
}>;