/**
 * GitHub Copilot OAuth Provider
 *
 * Uses OAuth tokens from AuthStorage to authenticate with GitHub Copilot's chat API.
 * The Copilot API speaks an OpenAI-compatible chat format, so we plug
 * `@ai-sdk/openai-compatible` into Copilot's API URL and use a custom fetch to inject
 * the bearer token and Copilot-specific headers.
 *
 * Inspired by:
 *   - opencode: https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/plugin/github-copilot/copilot.ts
 *   - pi-mono:  https://github.com/badlogic/pi-mono/blob/main/packages/ai/src/utils/oauth/github-copilot.ts
 */
import type { MastraModelConfig } from '@mastra/core/llm';
import type { CopilotModelEntry } from '../auth/providers/github-copilot.js';
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 tests / TUI integration). */
export declare function setAuthStorage(storage: AuthStorage | undefined): void;
/**
 * Build a fetch wrapper that authenticates with GitHub Copilot OAuth.
 *
 * - Injects the short-lived Copilot bearer token (auto-refreshed by AuthStorage).
 * - Adds the VS Code-like Copilot headers required by the API.
 * - Rewrites the request URL onto the per-token API base when `rewriteUrl` is true.
 */
export declare function buildGitHubCopilotOAuthFetch(opts?: {
    authStorage?: AuthStorage;
    rewriteUrl?: boolean;
}): typeof fetch;
/**
 * Creates a model that talks to GitHub Copilot using OAuth credentials.
 *
 * Copilot's `/chat/completions` endpoint is OpenAI-compatible, but GitHub Copilot
 * is not OpenAI. Use the generic OpenAI-compatible adapter with Copilot's base URL
 * instead of the OpenAI provider plus URL rewriting.
 */
export declare function githubCopilotProvider(modelId?: string, options?: {
    headers?: Record<string, string>;
}): MastraModelConfig;
/** Reset the in-process Copilot catalog cache (test seam, also useful after logout). */
export declare function clearCopilotCatalogCache(): void;
/**
 * Return the user's currently-available Copilot models.
 *
 * - Returns `[]` when the user is not logged in to GitHub Copilot.
 * - Returns the cached list when a recent fetch succeeded.
 * - On the cache-miss / expired path, fetches `/models` with a 5s timeout, filters
 *   to picker-enabled and non-policy-disabled models, then caches for 10 minutes.
 * - On fetch failure, returns a small hard-coded fallback (so packs still work
 *   offline) and caches that for 1 minute to avoid hammering the API.
 *
 * Concurrent calls during a fetch share the inflight promise.
 */
export declare function getCopilotModelCatalog(opts?: {
    authStorage?: AuthStorage;
}): Promise<CopilotModelEntry[]>;
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