/** @packageDocumentation
 * @module UiItemsProvider
 */
import { BackstageItem } from "./backstage/BackstageItem";
import { CommonStatusBarItem } from "./statusbar/StatusBarItem";
import { CommonToolbarItem } from "./toolbars/ToolbarItem";
import { UiItemsApplicationAction } from "./UiItemsManager";
import { AbstractWidgetProps } from "./widget/AbstractWidgetProps";
/** Application for items provided by a UiItemsProvider
 * @beta
 */
export interface UiItemsApplication {
    /** Validate and optionally update a Toolbar button item */
    validateToolbarButtonItem?: (item: CommonToolbarItem) => {
        updatedItem: CommonToolbarItem;
        action: UiItemsApplicationAction;
    };
    /** Validate and optionally update a StatusBar item */
    validateStatusBarItem?: (item: CommonStatusBarItem) => {
        updatedItem: CommonStatusBarItem;
        action: UiItemsApplicationAction;
    };
    /** Validate and optionally update a Backstage item */
    validateBackstageItem?: (item: BackstageItem) => {
        updatedItem: BackstageItem;
        action: UiItemsApplicationAction;
    };
    /** Validate and optionally update a Widget */
    validateWidget?: (widget: AbstractWidgetProps) => {
        updatedWidget: AbstractWidgetProps;
        action: UiItemsApplicationAction;
    };
}
/** Arbitrates between the [[UiItemsApplication]] and a [[UiItemsProvider]]
 * @beta
 */
export declare class UiItemsArbiter {
    private static _uiItemsApplication?;
    /** The UiItemsApplication implementation. The application should set this to validate items from the extensions. */
    static get uiItemsApplication(): UiItemsApplication | undefined;
    static set uiItemsApplication(app: UiItemsApplication | undefined);
    /** @internal */
    static clearApplication(): void;
    /** @internal */
    static updateToolbarButtonItems(items: ReadonlyArray<CommonToolbarItem>): ReadonlyArray<CommonToolbarItem>;
    /** @internal */
    static updateStatusBarItems(items: ReadonlyArray<CommonStatusBarItem>): ReadonlyArray<CommonStatusBarItem>;
    /** @internal */
    static updateBackstageItems(items: ReadonlyArray<BackstageItem>): ReadonlyArray<BackstageItem>;
    /** @internal */
    static updateWidgets(widgets: ReadonlyArray<AbstractWidgetProps>): ReadonlyArray<AbstractWidgetProps>;
}
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