export type ToastType = 'success' | 'error' | 'warning' | 'info';
export type ToastCallback = (type: ToastType, message: string) => void;
export interface ToastAPI {
    showSuccess: (message: string) => void;
    showError: (message: string) => void;
    showWarning: (message: string) => void;
    showInfo: (message: string) => void;
}
/**
 * Returns toast notification methods.
 * Delegates to the consumer-provided `toast` callback when available;
 * otherwise fires the internal event bus handled by InternalToastContainer.
 *
 * `fireInternalToast` dispatches on `window` with no notion of which
 * MasterPatternView instance sent it, and `InternalToastContainer` listens on
 * `window` too — so any mounted container (a sibling master, a different
 * lookup's nested popup) picks up the event whether it's "theirs" or not. A
 * consumer with `showInternalToasts={false}` and no `toast` callback was
 * relying on nobody being subscribed, which only holds by accident. Gating
 * the dispatch here — not just the container's mount — means "don't show
 * internal toasts" is honored regardless of what else happens to be mounted
 * on the page.
 *
 * @param externalToast - Optional toast callback from MasterPatternViewProps
 * @param showInternalToasts - Whether the owning MasterPatternView renders its
 *   own InternalToastContainer. `false` with no `externalToast` means this
 *   toast has nowhere of its own to go — drop it instead of firing globally.
 */
export declare function useToast(externalToast?: ToastCallback, showInternalToasts?: boolean): ToastAPI;
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