import type { UIEvent } from '@devvit/protos/types/devvit/ui/events/v1alpha/event.js';
import type { Form } from '@devvit/protos/types/devvit/ui/form_builder/v1alpha/form.js';
import type { Severity } from '@reddit/faceplate/types.js';
import type { ReactiveController, ReactiveElement } from 'lit';
import type { DevvitUIEffectEvent } from '../dispatcher/events.js';
export type EffectMessage = {
    onEvent?(event: UIEvent): void;
} & ({
    effectName: 'devvit:formEffect';
    form: Form;
} | {
    effectName: 'devvit:navigateToEffect';
    url: string;
} | {
    effectName: 'devvit:toastEffect';
    message: string;
    level: Severity;
});
/**
 * Manages communications to the devvit-ui-effect Event bus. All effects should
 * subclass `EffectHandler`. Most events are in response to effects. Events that
 * are user initiated, not effect initiated, should invoke
 * `DevvitBlocksWebView.postEvent()`.
 */
export declare abstract class EffectHandler implements ReactiveController {
    #private;
    protected readonly host: ReactiveElement;
    constructor(host: ReactiveElement);
    hostConnected(): void;
    hostDisconnected(): void;
    /**
     * Effect callback. Effects are side-effects (messages from the web view) of
     * running the web view wrapped in DOM events.
     *
     * @arg ev Any `devvit-ui-effect` event. The subclass must filter.
     */
    protected abstract onEvent(ev: DevvitUIEffectEvent): void;
}
//# sourceMappingURL=effect-handler.d.ts.map