import type { AstridChannelConfig } from './types.js';
/**
 * OAuth2 client_credentials flow with token caching and auto-refresh.
 */
export declare class OAuthClient {
    private config;
    private accessToken;
    private expiresAt;
    constructor(config: AstridChannelConfig);
    /** Get a valid token, refreshing if needed (5 min buffer). */
    ensureToken(): Promise<string>;
    /** Force-refresh the token. */
    refreshToken(): Promise<string>;
}
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