import { IoMessage, IoRequest, ToolkitAction } from '@aws-cdk/toolkit-lib';
export type SimpleSpread<L, R> = R & Pick<L, Exclude<keyof L, keyof R>>;
export type AmplifyEventMessage = {
    code?: string;
    action: ToolkitAction | 'amplify';
};
export type AmplifyIoHostEventMessage<T> = {} & SimpleSpread<IoMessage<T>, AmplifyEventMessage>;
export type AmplifyIoHostEventRequestMessageIoRequest<T, U> = IoRequest<T, U>;
export type AmplifyIOHost = {
    requestResponse: <T, U>(msg: AmplifyIoHostEventRequestMessageIoRequest<T, U>) => Promise<U>;
    notify: <T>(msg: AmplifyIoHostEventMessage<T>) => Promise<void>;
};
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