export declare const onPending: (type: any, delimiter?: string) => string;
export declare const onFulfilled: (type: any, delimiter?: string) => string;
export declare const onRejected: (type: any, delimiter?: string) => string;
export declare type Action<Type extends string, Payload = undefined, Meta = undefined> = Payload extends undefined ? Meta extends undefined ? {
    type: Type;
} : {
    type: Type;
    meta: Meta;
} : Payload extends Error ? Meta extends undefined ? {
    type: Type;
    payload: Payload;
    error: true;
} : {
    type: Type;
    payload: Payload;
    meta: Meta;
    error: true;
} : Meta extends undefined ? {
    type: Type;
    payload: Payload;
} : {
    type: Type;
    payload: Payload;
    meta: Meta;
};
export declare type AnyAction = Action<string>;
export declare type ActionCreator<T extends AnyAction, U extends any[] = any> = {
    (...args: U): T;
    toString(): T['type'];
};
export declare function createAction<Type extends string>(type: Type): ActionCreator<Action<Type>>;
export declare function createAction<Type extends string, Payload, U extends any[]>(type: Type, payloadCreator: (...args: U) => Payload): ActionCreator<Action<Type, Payload>, U>;
export declare function createAction<Type extends string, Payload, Metadata, U extends any[]>(type: Type, payloadCreator: (...args: U) => Payload, metadataCreator?: (...args: U) => Metadata): ActionCreator<Action<Type, Payload, Metadata>, U>;
export interface AsyncActionCreator<Type extends string, Payload, Metadata> extends ActionCreator<Action<Type, Promise<Payload>, Metadata>> {
    pending: ActionCreator<Action<string>>;
    fulfilled: ActionCreator<Action<string, Payload>>;
    rejected: ActionCreator<Action<string, Error>>;
}
/**
 * Asynchronous action creator factory.
 * @param type Action type.
 * @example
 * const getTodos = createAsyncAction('TODOS_GET', () => fetch('https://todos.com/todos'));
 */
export declare function createAsyncAction<Type extends string, Payload, Metadata, U extends any[]>(type: Type, payloadCreator: (...args: U) => Promise<Payload>, metadataCreator?: (...args: U) => Metadata, { promiseTypeDelimiter: delimiter, }?: {
    promiseTypeDelimiter?: string;
}): ActionCreator<Metadata extends undefined ? {
    type: Type;
    payload: Promise<Payload>;
} : {
    type: Type;
    payload: Promise<Payload>;
    meta: Metadata;
}, U> & {
    toString: () => never;
} & {
    pending: ActionCreator<{
        type: string;
    }, any>;
    fulfilled: ActionCreator<Action<string, Payload, undefined>, [payload: Payload]>;
    rejected: ActionCreator<{
        type: string;
        payload: Error;
        error: true;
    }, [payload: Error]>;
};