export declare const YIELD: {
    readonly SCIENCE: "YIELD_SCIENCE";
    readonly GOLD: "YIELD_GOLD";
    readonly HAPPINESS: "YIELD_HAPPINESS";
    readonly CULTURE: "YIELD_CULTURE";
    readonly PRODUCTION: "YIELD_PRODUCTION";
    readonly DIPLOMACY: "YIELD_DIPLOMACY";
    readonly FOOD: "YIELD_FOOD";
};