import { type FeatureFlagDefinition } from "./registry.js";
type NitroPluginDef = (nitroApp: any) => void | Promise<void>;
/** A tiny startup plugin for app-local, explicit feature-flag registration. */
export declare function createFeatureFlagsPlugin(options: {
    flags: readonly FeatureFlagDefinition[];
    /**
     * One-time compatibility bridge for apps that previously stored global
     * booleans together in a single settings object. Only legacy `true` values
     * are copied, and an explicit rule in the new store always wins.
     */
    legacyBooleanSetting?: {
        settingKey: string;
        flagKeys: readonly string[];
    };
}): NitroPluginDef;
export {};
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