@buka/class-transformer-extra/dist/esm/src/array/uniq.js

class-transformer-extra contains methods that's aren't included in the class-transform package.

import { Transform } from 'class-transformer';
import { uniq } from 'ramda';
export function Uniq(options) {
    return Transform(function UniqTransform({ value }) {
        return (Array.isArray(value) ? uniq(value) : value);
    }, options);
}