import type { z } from 'zod';
export type AdapterConfigResult<TConfig> = {
    _tag: 'Ok';
    config: TConfig;
} | {
    _tag: 'Err';
    issues: string[];
};
export type BroadcastFn<T> = (config: T, version: string) => Promise<void>;
export type SubscribeFn<T> = (config: T, onMessage: (msg: {
    version: string;
}) => void) => () => void;
/**
 * A realtime provider for `updateStrategy`. It lives in nuxt.config, so every
 * field must survive Nuxt's deep clone of the config: plain data and functions,
 * never class instances.
 */
export interface SkewAdapter<TConfig = unknown, TPublicConfig extends Record<string, unknown> = Record<string, unknown>> {
    name: string;
    config: TConfig;
    /** Validate `config` at build time. */
    parseConfig: (config: unknown) => AdapterConfigResult<TConfig>;
    /** The part of `config` that ships to the browser. Never include secrets. */
    toPublicConfig: (config: TConfig) => TPublicConfig;
    /**
     * Module the client bundles: an absolute path, an alias such as `~/`, or a
     * package specifier. It must export `subscribe` (see `defineWebSubscribe`).
     */
    web: string;
    /** Packages the build requires before it bundles `web`. */
    dependencies: string[];
    /** Runs on the build machine after a production build, with the new build id. */
    broadcast: BroadcastFn<TConfig>;
}
export type SkewAdapterFactory<TConfig, TPublicConfig extends Record<string, unknown> = Record<string, unknown>> = (config: TConfig) => SkewAdapter<TConfig, TPublicConfig>;
export interface DefineAdapterOptions<TConfig, TPublicConfig extends Record<string, unknown>> {
    name: string;
    schema: z.ZodType<TConfig>;
    toPublicConfig: (config: TConfig) => TPublicConfig;
    web: string;
    dependencies?: string[];
    broadcast: BroadcastFn<TConfig>;
}
export declare function defineAdapter<TConfig, TPublicConfig extends Record<string, unknown>>(options: DefineAdapterOptions<TConfig, TPublicConfig>): SkewAdapterFactory<TConfig, TPublicConfig>;
export declare const defineNodeBroadcast: <T>(broadcast: BroadcastFn<T>) => BroadcastFn<T>;
export declare const defineWebSubscribe: <T>(subscribe: SubscribeFn<T>) => SubscribeFn<T>;