export declare function reportUsageToFirebase(inputTokens: number, outputTokens: number): Promise<void>;
/**
 * Fetch the signed-in user's `users/{uid}` document and return their balance
 * in microdollars (1e-6 USD), or `null` if unavailable. Best-effort: returns
 * `null` on auth errors, network errors, or timeout — never throws.
 *
 * Used by the launch banner. The caller should pass a tight timeout (e.g.
 * 800ms) so a slow network doesn't block startup.
 */
export declare function fetchUserBalanceMicrodollars(timeoutMs?: number): Promise<number | null>;
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