/**
 * Lemma API v2 — TokenCounter (Lane E)
 *
 * Real token counting of a payload. The count is determined by the actual content
 * of the payload, never by an average-per-request constant. When a count cannot be
 * produced reliably the method returns `null` and the caller omits the event from
 * reports rather than estimating (the `excludedEvents` counter in UsageResponse).
 *
 * This is a best-effort, dependency-free tokenizer. It is deterministic and fully
 * reproducible from the payload, which is what the product's auditability requires.
 * No library is loaded here — `package.json` is frozen for this lane.
 */
export declare class TokenCounter {
    readonly lane = "E";
    /**
     * Measure the token count of a payload.
     *
     * Returns:
     *   - a `number` >= 0 when the payload is measurable (counted from its content).
     *   - `null` when the payload cannot be reliably measured (missing, not a string,
     *     or otherwise unmeasurable) — the caller must omit the event, not estimate.
     */
    count(payload: string): number | null;
}
export default TokenCounter;
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