/**
 * Returns the browser's `navigator.userAgent` string for inclusion in
 * instrumentation events.
 *
 * Falls back to an empty string in environments where `navigator` is not
 * available (e.g., Node.js SSR, service workers) so that callers never need
 * to guard against undefined.
  * @notInstrumented
 */
export declare const getUserAgent: () => string;
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