import { type Signal } from "@angular/core";
export declare function injectSdSystemConfigResource<T>(options: {
    key: Signal<string | undefined>;
}): {
    value: import("@angular/core").WritableSignal<T | undefined>;
    isLoading: Signal<boolean>;
    status: Signal<import("@angular/core").ResourceStatus>;
    hasValue: () => boolean;
    reload: () => boolean;
    set: (value: T | undefined) => void;
    update(fn: (prev: T | undefined) => T | undefined): void;
};
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