import { TSS_SERVER_FUNCTION } from './constants.js';
import { AnyFunctionMiddleware, AnyRequestMiddleware, CreateMiddlewareFn } from './createMiddleware.js';
import { CustomFetch } from './createServerFn.js';
import { AnySerializationAdapter, Register, SSROption } from '@tanstack/router-core';
export interface StartInstanceOptions<in out TSerializationAdapters, in out TDefaultSsr, in out TRequestMiddlewares, in out TFunctionMiddlewares> {
    '~types': StartInstanceTypes<TSerializationAdapters, TDefaultSsr, TRequestMiddlewares, TFunctionMiddlewares>;
    serializationAdapters?: TSerializationAdapters;
    defaultSsr?: TDefaultSsr;
    requestMiddleware?: TRequestMiddlewares;
    functionMiddleware?: TFunctionMiddlewares;
    /**
     * Configuration options for server functions.
     */
    serverFns?: {
        /**
         * A custom fetch implementation to use for all server function calls.
         * This can be overridden by middleware or at the call site.
         *
         * Precedence (highest to lowest):
         * 1. Call site: `serverFn({ fetch: customFetch })`
         * 2. Later middleware: Last middleware in chain that provides `fetch`
         * 3. Earlier middleware: First middleware in chain that provides `fetch`
         * 4. createStart: `createStart({ serverFns: { fetch: customFetch } })`
         * 5. Default: Global `fetch` function
         *
         * @note Only applies on the client side. During SSR, server functions are called directly.
         */
        fetch?: CustomFetch;
    };
}
export interface StartInstance<in out TSerializationAdapters, in out TDefaultSsr, in out TRequestMiddlewares, in out TFunctionMiddlewares> {
    getOptions: () => Promise<StartInstanceOptions<TSerializationAdapters, TDefaultSsr, TRequestMiddlewares, TFunctionMiddlewares>> | StartInstanceOptions<TSerializationAdapters, TDefaultSsr, TRequestMiddlewares, TFunctionMiddlewares>;
    createMiddleware: CreateMiddlewareFn<Register>;
}
export interface StartInstanceTypes<in out TSerializationAdapters, in out TDefaultSsr, in out TRequestMiddlewares, in out TFunctionMiddlewares> {
    serializationAdapters: TSerializationAdapters;
    defaultSsr: TDefaultSsr;
    requestMiddleware: TRequestMiddlewares;
    functionMiddleware: TFunctionMiddlewares;
}
export declare const createStart: <const TSerializationAdapters extends ReadonlyArray<AnySerializationAdapter> = [], TDefaultSsr extends SSROption = SSROption, const TRequestMiddlewares extends ReadonlyArray<AnyRequestMiddleware> = [], const TFunctionMiddlewares extends ReadonlyArray<AnyFunctionMiddleware> = []>(getOptions: () => Promise<Omit<StartInstanceOptions<TSerializationAdapters, TDefaultSsr, TRequestMiddlewares, TFunctionMiddlewares>, "~types">> | Omit<StartInstanceOptions<TSerializationAdapters, TDefaultSsr, TRequestMiddlewares, TFunctionMiddlewares>, "~types">) => StartInstance<TSerializationAdapters, TDefaultSsr, TRequestMiddlewares, TFunctionMiddlewares>;
export type AnyStartInstance = StartInstance<any, any, any, any>;
export type AnyStartInstanceOptions = StartInstanceOptions<any, any, any, any>;
declare module '@tanstack/router-core' {
    interface SerializableExtensions {
        serverFn: {
            [TSS_SERVER_FUNCTION]: true;
        };
    }
}