/** Stable react-query key for an addon's per-org settings. */
export declare function addonSettingsKey(addonKey: string): readonly ["addon-settings", string];
/**
 * Merge saved org values over the caller's defaults so a never-saved setting
 * falls back to its default. Pure + exported for unit testing. Only keys that
 * are actually present in `stored` win — an explicit `undefined` in the stored
 * payload is treated as "not saved" and yields the default (the host omits
 * unsaved keys, but this keeps a sparse payload well-behaved).
 */
export declare function mergeAddonSettings<T extends Record<string, unknown>>(defaults: Partial<T> | undefined, stored: Partial<T> | null | undefined): T;
export interface UseAddonSettingsOptions<T> {
    /**
     * Fallback values (typically the addon manifest's `settings[].default`)
     * merged UNDER the saved org values. A setting the org hasn't saved
     * resolves to its default here.
     */
    defaults?: Partial<T>;
    /** Override staleTime (default 30s — org config changes rarely). */
    staleTime?: number;
    /** Defer fetching (e.g. until the addon key is known). */
    enabled?: boolean;
}
export interface UseAddonSettingsResult<T> {
    /** Saved org values merged over `defaults`. Never null. */
    settings: T;
    isLoading: boolean;
    error: unknown;
    refetch: () => void;
}
/**
 * Read an addon's per-organization settings.
 *
 * This is the ecosystem-standard way for a federated addon to read its own
 * config; prefer it over a hand-rolled fetch so every addon caches, merges
 * defaults, and invalidates identically.
 *
 * @example
 * type PosSettings = { allowNegativeStock: boolean; roundingMode: string }
 * const { settings, isLoading } = useAddonSettings<PosSettings>('pos', {
 *   defaults: { allowNegativeStock: false, roundingMode: 'nearest' },
 * })
 * if (!isLoading && settings.allowNegativeStock) { ... }
 */
export declare function useAddonSettings<T extends Record<string, unknown> = Record<string, unknown>>(addonKey: string, opts?: UseAddonSettingsOptions<T>): UseAddonSettingsResult<T>;
/**
 * Optional write companion — PUTs a (partial) settings object and invalidates
 * the read query so `useAddonSettings` re-resolves. The host's generic config
 * modal does its own PUT; this exists for addons that ship a custom config
 * surface. Backward-compatible: purely additive.
 *
 * @example
 * const update = useUpdateAddonSettings('pos')
 * update.mutate({ allowNegativeStock: true })
 */
export declare function useUpdateAddonSettings<T extends Record<string, unknown> = Record<string, unknown>>(addonKey: string): import("@tanstack/react-query").UseMutationResult<Partial<T>, Error, Partial<T>, unknown>;
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