/**
 * Collects device / browser context metadata.
 * All values are derived from standard browser APIs — no external library needed.
 * Sent to the backend at liveness/create so they appear in the webhook
 * request_context block.
 */
export interface DeviceMetadata {
    device_type: "mobile" | "desktop" | "tablet";
    os_name: string;
    browser_timezone: string;
    fingerprint_id: string;
}
export declare function collectDeviceMetadata(): DeviceMetadata;
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