/**
 * Shared OAuth fetch wrapper for Anthropic API requests.
 *
 * Extracted from `providers/anthropic.ts` so that any provider or proxy layer
 * that needs OAuth-authenticated Anthropic requests can reuse the same logic.
 *
 * Applies full "cloaking" to make requests indistinguishable from the
 * official Claude CLI / CLIProxyAPI, which is required for OAuth + tools
 * to work correctly.
 *
 * @module proxy/oauthFetch
 */
import { CLAUDE_CLI_USER_AGENT, MCP_TOOL_PREFIX } from "../auth/anthropicOAuth.js";
export { CLAUDE_CLI_USER_AGENT, MCP_TOOL_PREFIX };
/**
 * Creates a custom fetch function for OAuth-authenticated requests.
 * This wrapper applies all required transformations for OAuth mode:
 * - Uses Authorization: Bearer header (NOT x-api-key)
 * - Adds OAuth-required beta headers
 * - Sets User-Agent to Claude CLI
 * - Adds ?beta=true query parameter to /v1/messages
 * - Injects billing header & agent block into system prompt
 * - Injects Claude-Code-shaped user ID into metadata
 * - Adds Stainless SDK headers for fingerprint matching
 * - Disables thinking when tool_choice is forced
 *
 * Accepts a getter function instead of a static token so that refreshed
 * tokens are picked up automatically on each request.
 *
 * @param getToken              - Function returning the current OAuth access token
 * @param includeOptionalBetas  - Whether to include optional beta headers (default true)
 * @param enableMcpPrefix       - Whether to apply mcp_ prefix/strip logic to tool names (default false)
 * @param skipBodyTransform     - When true, skip ALL body modifications (billing header, user ID, tool prefix).
 *                                Used for proxy passthrough where the request body must be forwarded as-is.
 */
export declare function createOAuthFetch(getToken: () => string, includeOptionalBetas?: boolean, enableMcpPrefix?: boolean, skipBodyTransform?: boolean): typeof fetch;