/**
 * Source: [jed's gist's comment]{@link https://gist.github.com/jed/982883?permalink_comment_id=3223002#gistcomment-3223002}.
 * Returns a random v4 UUID of the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx,
 * where each x is replaced with a random hexadecimal digit from 0 to f, and
 * y is replaced with a random hexadecimal digit from 8 to b.
 * Used to generate UUIDs for deviceIds.
 * @private
 */
export declare const UUID: (a?: any) => string;
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