export type ServerTimingConfig = Record<string, ServerTimingMetricSpec>;
type ServerTimingMetricSpec = [ServerTimingType] | [ServerTimingType, DurationMetricMultiplier];
type ServerTimingType = typeof TYPE_DURATION | typeof TYPE_DESCRIPTION;
/**
 * A server timing metric that has its value set to the duration field
 */
export declare const TYPE_DURATION = "r";
/**
 * A server timing metric that has its value set to the description field
 */
export declare const TYPE_DESCRIPTION = "s";
/**
 * Duration metrics are stored in the lowest common unit, e.g. bytes for size metrics or milliseconds
 * for time metrics. Customers can send any unit in the duration field, so we need to multiply it
 * to convert it to the lowest common unit.
 */
type DurationMetricMultiplier = number;
export declare function getKeyValuePairs(config: ServerTimingConfig, serverTiming: readonly PerformanceServerTiming[]): Record<string, string | number>;
export {};