/**
 * Coarse, dependency-free User-Agent → `{ browser, os }` derivation, run
 * server-side at ingestion (ADR 0041). The raw User-Agent is **never stored** — it
 * is consumed for the visitor hash and reduced here to two low-cardinality,
 * non-PII family labels used only to segment the performance panels (ADR 0003).
 *
 * Intentionally coarse: no version numbers, no device model, no exhaustive bot
 * matrix. The goal is a handful of stable buckets ("is my scene slower on Safari
 * / iOS?"), not fingerprinting. Anything unrecognized collapses to `"Other"`.
 */
/** Low-cardinality browser + OS families derived from a User-Agent. */
export interface ClientInfo {
    /** Coarse browser family, e.g. `"Chrome"`, `"Safari"`, `"Other"`. */
    browser: string;
    /** Coarse OS family, e.g. `"Windows"`, `"iOS"`, `"Other"`. */
    os: string;
}
/**
 * Derive coarse `{ browser, os }` from a User-Agent header. An empty/missing UA
 * yields `{ browser: "Other", os: "Other" }`. The input string is not retained.
 */
export declare function parseClientInfo(ua: string | undefined): ClientInfo;
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