/** Returns whether metrics logging should be enabled by default, checking env vars CI and BENCHMARK. */
export declare function isMetricsLoggingRequested(): boolean;
/**
 * Configures an NDJSON logger to output entries to a local file that have an `eventName` associated.
 * Idempotent and automatically called by `setup` if CI or BENCHMARK env vars are set.
 */
export declare function setupMetricsLogger(filename: string): void;
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