/**
 * GitHub credentials storage
 *
 * Stores OAuth tokens securely in ~/.arial/github-credentials.json
 */
import type { Result } from "../types.js";
/**
 * Stored GitHub credentials
 */
export interface GitHubCredentials {
    /** OAuth access token */
    accessToken: string;
    /** Token type (usually 'bearer') */
    tokenType: string;
    /** Granted scopes */
    scope: string;
    /** When the token was stored */
    createdAt: string;
}
/**
 * Credentials file error
 */
export interface CredentialsError {
    code: "NOT_FOUND" | "INVALID_FORMAT" | "READ_FAILED" | "WRITE_FAILED";
    message: string;
}
/**
 * Load GitHub credentials from disk
 */
export declare function loadGitHubCredentials(): Promise<Result<GitHubCredentials, CredentialsError>>;
/**
 * Save GitHub credentials to disk
 */
export declare function saveGitHubCredentials(credentials: Omit<GitHubCredentials, "createdAt">): Promise<Result<void, CredentialsError>>;
/**
 * Delete stored GitHub credentials
 */
export declare function deleteGitHubCredentials(): Promise<Result<void, CredentialsError>>;
/**
 * Get the GitHub token, preferring environment variable over stored credentials
 *
 * Priority:
 * 1. GITHUB_TOKEN environment variable (legacy support)
 * 2. Stored OAuth credentials
 */
export declare function getGitHubToken(): Promise<string | null>;
/**
 * Get the path to the credentials file (for display purposes)
 */
export declare function getCredentialsPath(): string;
/**
 * Check if stored credentials have the required scope for PR creation
 */
export declare function validateGitHubCredentials(): Promise<{
    valid: boolean;
    hasToken: boolean;
    scope?: string;
    warning?: string;
}>;
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