/**
 * OpenAI Codex OAuth Provider
 *
 * Uses OAuth tokens from AuthStorage to authenticate with ChatGPT Plus/Pro subscription.
 * This allows access to OpenAI models through the ChatGPT OAuth flow.
 *
 * Inspired by opencode's Codex plugin implementation:
 * https://github.com/sst/opencode/blob/main/packages/opencode/src/plugin/codex.ts
 */
import type { MastraModelConfig } from '@mastra/core/llm';
import type { LanguageModelMiddleware } from 'ai';
import { AuthStorage } from '../auth/storage.js';
/**
 * Get or create the shared AuthStorage instance
 */
export declare function getAuthStorage(): AuthStorage;
/**
 * Set a custom AuthStorage instance (useful for TUI integration)
 */
export declare function setAuthStorage(storage: AuthStorage | undefined): void;
/** Valid thinking level values. */
export type ThinkingLevel = 'off' | 'low' | 'medium' | 'high' | 'xhigh';
export declare function getEffectiveThinkingLevel(modelId: string, level: ThinkingLevel): ThinkingLevel;
export declare const THINKING_LEVEL_TO_REASONING_EFFORT: Record<ThinkingLevel, string | undefined>;
/**
 * Create Codex middleware with the given reasoning effort level.
 */
export declare function createCodexMiddleware(reasoningEffort?: string): LanguageModelMiddleware;
/**
 * Build a fetch function that handles OpenAI Codex OAuth.
 * Preserves non-authorization headers from init.
 * When rewriteUrl is true (default), rewrites /v1/responses and /chat/completions
 * to the Codex API endpoint. Set rewriteUrl: false for gateway usage where the
 * SDK already targets the correct URL.
 */
export declare function buildOpenAICodexOAuthFetch(opts?: {
    authStorage?: AuthStorage;
    rewriteUrl?: boolean;
}): typeof fetch;
/**
 * Creates an OpenAI model using ChatGPT OAuth authentication
 * Uses OAuth tokens from AuthStorage (auto-refreshes when needed)
 *
 * IMPORTANT: This uses the Codex API endpoint, not the standard OpenAI API.
 * URLs are rewritten from /v1/responses or /chat/completions to the Codex endpoint.
 */
export declare function openaiCodexProvider(modelId?: string, options?: {
    thinkingLevel?: ThinkingLevel;
    headers?: Record<string, string>;
}): MastraModelConfig;
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