import type { JourneyEvent, TagValue } from './types';
/** Match Datadog metric-tag value rules so RUM attributes / globals join derived SLO tags. */
export declare function normalizeTagValue(value: string): string;
export declare function emptyRecord(): Record<string, TagValue>;
export interface CopyRecordOptions {
    maxKeys: number;
    /** When true, keys are run through {@link normalizeTagValue} (sink / wire). */
    normalizeKeys?: boolean;
    /** When true (default), string values are normalized. */
    normalizeStringValues?: boolean;
}
/**
 * Own-key copy onto a null-prototype object. Skips unsafe keys and excess keys.
 */
export declare function copyRecord(src: Record<string, unknown> | undefined, options: CopyRecordOptions): Record<string, TagValue>;
/** Merge `src` into `target` (null-prototype), honouring caps and unsafe-key skips. */
export declare function assignRecord(target: Record<string, TagValue>, src: Record<string, unknown> | undefined, maxKeys: number): void;
export declare function setSafeAttribute(attributes: Record<string, TagValue>, key: string, value: string | number | boolean): void;
/** Default-sink payload: normalized keys/names, capped maps, no unsafe keys. */
export declare function sanitizeJourneyEvent(event: JourneyEvent): JourneyEvent;
/** True when payload already passed through sanitizeJourneyEvent. */
export declare function isSanitizedJourneyEvent(event: JourneyEvent): boolean;
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