/**
 * generate a random alphanumeric string of `length` chars (default 16).
 * useful for `InlineQueryResult.id` and any other place telegram wants an opaque unique-per-call id
 *
 * @example
 * ```ts
 * InlineQueryResult.article({ id: randomId(), title: '…', content: ... })
 * InlineQueryResult.article({ id: `${randomId(8)}-suffix`, ... })
 * ```
 */
export declare function randomId(length?: number): string;
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