import { Ref } from 'vue';

export type SavePointValueProvider<T> = {
    getCurrentValue: () => T;
    setCurrentValue: (value: T) => void;
    compare?: (savedValue: T, currentValue: T) => boolean;
};
export type SavePointHandlerRegisterOption<T> = {
    field: Ref<HTMLElement | undefined>;
} & SavePointValueProvider<T>;
export interface ChildSavePoint {
    set(): void;
    rollback(): void;
    isModified(): boolean;
}
export interface SavePoint {
    registerField<T>(option: SavePointHandlerRegisterOption<T>): SavePointHandler<T>;
    unregisterField(field: Ref<HTMLElement | undefined>): void;
    addChild(child: ChildSavePoint): void;
    removeChild(child: ChildSavePoint): void;
    set(): void;
    setNextTick(): Promise<void>;
    rollback(): void;
    isModified(): boolean;
}
export declare class SavePointImpl implements SavePoint {
    private fields;
    private children?;
    registerField<T>(option: SavePointHandlerRegisterOption<T>): SavePointHandler<T>;
    unregisterField(field: Ref<HTMLElement | undefined>): void;
    addChild(child: ChildSavePoint): void;
    removeChild(child: ChildSavePoint): void;
    set(): void;
    setNextTick(): Promise<void>;
    rollback(): void;
    isModified(): boolean;
}
export declare const provideSavePoint: () => SavePoint;
export declare const useSavePoint: () => SavePoint | undefined;
export declare const cancelProvidedSavePoint: () => void;
export interface SavePointHandler<T> {
    saveValue(): void;
    getSavedValue(): T | undefined;
    rollbackValue(): void;
    isModified(currentValue: T): boolean;
    isFieldModified(): boolean;
}