import { Token } from '@lumino/coreutils';
import type { ISignal } from '@lumino/signaling';
import type { Widget } from '@lumino/widgets';
/**
 * The inspector panel token.
 */
export declare const IInspector: Token<IInspector>;
/**
 * An interface for an inspector.
 */
export interface IInspector {
    /**
     * The source of events the inspector listens for.
     */
    source: IInspector.IInspectable | null;
}
/**
 * A namespace for inspector interfaces.
 */
export declare namespace IInspector {
    /**
     * The definition of an inspectable source.
     */
    interface IInspectable {
        /**
         * A signal emitted when the inspector should clear all items.
         */
        cleared: ISignal<any, void>;
        /**
         * A signal emitted when the inspectable is disposed.
         */
        disposed: ISignal<any, void>;
        /**
         * A signal emitted when an inspector value is generated.
         */
        inspected: ISignal<any, IInspectorUpdate>;
        /**
         * Test whether the inspectable has been disposed.
         */
        isDisposed: boolean;
        /**
         * Indicates whether the inspectable source emits signals.
         *
         * #### Notes
         * The use case for this attribute is to limit the API traffic when no
         * inspector is visible. It can be modified by the consumer of the source.
         */
        standby: boolean;
        /**
         * Handle a text changed signal from an editor.
         *
         * #### Notes
         * Update the hints inspector based on a text change.
         */
        onEditorChange(customText?: string): void;
    }
    /**
     * An update value for code inspectors.
     */
    interface IInspectorUpdate {
        /**
         * The content being sent to the inspector for display.
         */
        content: Widget | null;
    }
}