import { Component, JSX } from "react";
import { OptionsObject, ProviderContext, RequiredBy, SnackbarKey, SnackbarMessage, SnackbarProviderProps, TransitionHandlerProps } from "./types";
type Reducer = (state: State) => State;
export interface Snack extends RequiredBy<OptionsObject, "key" | "variant" | "anchorOrigin"> {
    message: SnackbarMessage;
    open: boolean;
    entered: boolean;
    requestClose: boolean;
}
interface State {
    snacks: Snack[];
    queue: Snack[];
    contextValue: ProviderContext;
}
export declare const SnackbarContext: import("react").Context<ProviderContext>;
export declare function useSnackbar(): ProviderContext;
export declare class SnackbarProvider extends Component<SnackbarProviderProps, State> {
    constructor(props: SnackbarProviderProps);
    get maxSnack(): number;
    /**
     * Adds a new snackbar to the queue to be presented.
     * Returns generated or user defined key referencing the new snackbar or null
     */
    enqueueSnackbar: (message: SnackbarMessage, opts?: OptionsObject) => SnackbarKey;
    /**
     * Reducer: Display snack if there's space for it. Otherwise, immediately
     * begin dismissing the oldest message to start showing the new one.
     */
    handleDisplaySnack: Reducer;
    /**
     * Reducer: Display items (notifications) in the queue if there's space for them.
     */
    processQueue: Reducer;
    /**
     * Reducer: Hide oldest snackbar on the screen because there exists a new one which we have to display.
     * (ignoring the one with 'persist' flag. i.e. explicitly told by user not to get dismissed).
     *
     * Note 1: If there is already a message leaving the screen, no new messages are dismissed.
     * Note 2: If the oldest message has not yet entered the screen, only a request to close the
     *         snackbar is made. Once it entered the screen, it will be immediately dismissed.
     */
    handleDismissOldest: Reducer;
    /**
     * Set the entered state of the snackbar with the given key.
     */
    handleEnteredSnack: TransitionHandlerProps["onEntered"];
    /**
     * Hide a snackbar after its timeout.
     */
    handleCloseSnack: TransitionHandlerProps["onClose"];
    /**
     * Close snackbar with the given key
     */
    closeSnackbar: ProviderContext["closeSnackbar"];
    /**
     * When we set open attribute of a snackbar to false (i.e. after we hide a snackbar),
     * it leaves the screen and immediately after leaving animation is done, this method
     * gets called. We remove the hidden snackbar from state and then display notifications
     * waiting in the queue (if any). If after this process the queue is not empty, the
     * oldest message is dismissed.
     */
    handleExitedSnack: TransitionHandlerProps["onExited"];
    render(): JSX.Element;
}
export {};