/**
 * Read an env var and require a strictly positive integer.
 */
export declare const readPositiveInt: (envName: string, fallback: number) => number;
export declare const readNonNegativeInt: (envName: string, fallback: number) => number;
/**
 * Whether to route trace export through an on-disk WAL queue
 * drained by a background daemon, instead of the synchronous
 * HTTP exporter.
 */
export declare function asyncExportEnabled(): boolean;