export declare enum LoadingEventTopics {
    add = "loading-service.add",
    remove = "loading-service.remove",
    setProgress = "loading-service.set-progress"
}
export interface LoadingTaskState {
    total: number;
    current: number;
}
export interface LoadingTask {
    id: string;
    active: boolean;
    state?: LoadingTaskState;
    warnBeforeUnload?: boolean;
}
export interface LoadingTaskCallbackArguments {
    setProgress: (args: LoadingTaskState) => void;
}
export declare class LoadingService {
    private tasks;
    get isLoading(): boolean;
    /**
     * Get the current progress from 0 to 100.
     * Returns null if at least one task is indeterminate.
     */
    get currentProgress(): number | null;
    addTask<T>(callback: ({ setProgress }: LoadingTaskCallbackArguments) => Promise<T>, { debounceTime, indeterminate, warnBeforeUnload }?: {
        debounceTime?: number;
        indeterminate?: boolean;
        warnBeforeUnload?: boolean;
    }): Promise<T>;
    private removeTask;
    private setProgress;
    private onBeforeUnload;
}