import { NullableHeaders } from "./headers.mjs";
import type { BodyInit } from "./builtin-types.mjs";
import { Stream } from "../core/streaming.mjs";
import type { Middleware } from "../core/middleware.mjs";
import type { HTTPMethod, MergedRequestInit } from "./types.mjs";
import { type HeadersLike } from "./headers.mjs";
export type FinalRequestOptions = RequestOptions & {
    method: HTTPMethod;
    path: string;
};
/**
 * Tracks which fallback a sequence of requests is pinned to.
 *
 * Create one (`new BetaFallbackState()`) and pass it via the `fallbackState`
 * request option on every request that should share the pin — the turns of one
 * conversation, or any wider scope the stickiness should apply to;
 * `betaRefusalFallbackMiddleware` mutates it in place when a model refuses.
 */
export declare class BetaFallbackState {
    /**
     * Index into the fallback chain the requests are pinned to.
     *
     * `undefined` (or -1) targets the original request params; the middleware
     * sets it to the index of the fallback that accepted the request.
     */
    index?: number;
}
/**
 * Options for an individual API request.
 *
 * Declared as an interface so it can be extended via declaration merging, e.g.
 * to thread custom per-request context through to {@link Middleware}:
 *
 * ```ts
 * declare module '@anthropic-ai/sdk/internal/request-options' {
 *   interface RequestOptions {
 *     myContext?: string;
 *   }
 * }
 * ```
 *
 * The SDK ignores properties it doesn't know about; they are visible to
 * middleware on `ctx.options`.
 */
export interface RequestOptions {
    /**
     * The HTTP method for the request (e.g., 'get', 'post', 'put', 'delete').
     */
    method?: HTTPMethod;
    /**
     * The URL path for the request.
     *
     * @example "/v1/foo"
     */
    path?: string;
    /**
     * Query parameters to include in the request URL.
     */
    query?: object | undefined | null;
    /**
     * The request body. Can be a string, JSON object, FormData, or other supported types.
     */
    body?: unknown;
    /**
     * HTTP headers to include with the request. Can be a Headers object, plain object, or array of tuples.
     */
    headers?: HeadersLike;
    /**
     * The maximum number of times that the client will retry a request in case of a
     * temporary failure, like a network error or a 5XX error from the server.
     *
     * @default 2
     */
    maxRetries?: number;
    stream?: boolean | undefined;
    /**
     * The maximum amount of time (in milliseconds) that the client should wait for a response
     * from the server before timing out a single request.
     *
     * @unit milliseconds
     */
    timeout?: number;
    /**
     * Additional `RequestInit` options to be passed to the underlying `fetch` call.
     * These options will be merged with the client's default fetch options.
     */
    fetchOptions?: MergedRequestInit;
    /**
     * An AbortSignal that can be used to cancel the request.
     */
    signal?: AbortSignal | undefined | null;
    /**
     * Additional {@link Middleware} to wrap this request's HTTP attempts.
     *
     * These run after any client-level middleware (but still outside any backend
     * adaptation) and apply to every attempt of this request, including retries.
     */
    middleware?: ReadonlyArray<Middleware> | undefined;
    /**
     * Sticky state for `betaRefusalFallbackMiddleware`.
     *
     * The middleware records which fallback it settled on, so requests sharing
     * the state skip models that already refused. Pass the same object across
     * whatever scope the pin should apply to — typically a conversation.
     */
    fallbackState?: BetaFallbackState;
    /**
     * A unique key for this request to enable idempotency.
     */
    idempotencyKey?: string;
    /**
     * Override the default base URL for this specific request.
     */
    defaultBaseURL?: string | undefined;
    __binaryResponse?: boolean | undefined;
    __streamClass?: typeof Stream;
}
export type EncodedContent = {
    bodyHeaders: HeadersLike;
    body: BodyInit;
};
export type RequestEncoder = (request: {
    headers: NullableHeaders;
    body: unknown;
}) => EncodedContent;
export declare const FallbackEncoder: RequestEncoder;
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